Date   
Re: TDA2822 ill treatment test!

 

Dexter,

uBitx amp is single ended part of stereo amp. It is not bridged!
One lead is ground and other goes to output cap.

In bridge both outputs are used and cap may not be needed.

Raj


At 01-03-2018, you wrote:
Read the thread/s thoroughly, Raj (and all). Shorting the output keeps both legs of it above ground. It would seem that taking either leg to ground (that 'ring' connection that is taken there by a mono plug in particular) does the damage. It's the 'cheapo' method of boosting audio output: bi-phase two amps: 4x the power from the same supply voltage. This package evidently does this internally. If the spec sheet shows the internal circuit, this becomes obvious. I await reports...

Re: uBITX - U1 Getting Fried - possible cause #ubitx

 

Jerry,

I changed mine to 100u in the B40s and even reduced the input 1uf as we dont need
response below 300hz. I calculated the time constant from the roll off freq and worked
out the cap.

In bridge mode you get double the power! I had originally recommended bridge to Farhan.

Raj


At 02-03-2018, you wrote:
I think you're right.

The output pin has a quiescent DC voltage of around half the supply voltage, or about 6v,
so the 470uF cap will have a 6v charge on it when operating.  A significant bit of energy
for the TDA2822 to provide, and it tries to do so almost instantaneously in the case of a short.
A series resistor seems prudent. 

Perhaps the 470uF cap could be reduced to 100uF.
At 500hz the 100uF would have an impedance of 1/(2*pi*500*100e-6) = 3.18 ohms,
which seems borderline for good sound quality when using an 8 ohm speaker.

I vote for the resistor.  Something like 4 or 8 ohms, 1/2 Watt.
But worth experimenting if somebody has a stash of cheap TDA2822's on hand.

Configuring the TDA2822 for Dex's  bridge configuration does away with the cap charging problem,
but now the headphone jack has to be floating.  The bridge would be ideal for an internal speaker.

Jerry

On Thu, Mar 1, 2018 at 11:47 am, Jim Sheldon wrote:
My take is that huge 470 uF electrolytic in the output of the TDA2822M and the speaker gets a huge surge at turn on and during any loud noise or POP in the audio chain.

Re: TDA2822 ill treatment test!

 

Did some more tests.

Normal audio use the current was 60-70mA

Dead short with varied drive the current was 300-800mA. At 800mA the chip got hot!
The current did not go above 1A at any time.

I suspect there are TDA2822Ds masquerading as TDA2822M.

Raj

At 01-03-2018, you wrote:

Having used TDA2822 for decades and never had a failure of any kind even with the chip running very hot,
I got this urge to short my uBitx audio output and see it the chip blows.

Power supply 13.6V
Current limit 2A

Touching the volume control leads produces a loud 50Hz hum. At this volume I directly shorted the wires
at the EP jack. The chip got mildly warm thats it.

No smoke or explosions ! I think that some may have got bad/defective/BY chips..

Cheers

--
Raj, vu2zap
Bengaluru, South India.

Re: B40 LM386 and µB TDA2822 and that 470µF Cap

Tim Gorman
 

If you insert a mono plug into a TRS jack the ring terminal of the
jack is almost always shorted to ground (i.e. the sleeve). If you wire
the output of the 2822 to both the tip and ring terminals and then
insert a mono plug there simply isn't any doubt that you are probably
going to short the output of the 2822 to ground. Bad things will
happen.

There is no reason to wire the output of the 2822 to both the tip and
the ring terminals. If you have a stereo headset then wire both headset
leads to tip of the plug and only wire up the tip lead on the socket.
Then if someone inadvertently plugs in a mono plug you won't short the
output of the 2822 to ground.

I agree that the large charging current going into the 470uf cap could
stress the 2822, perhaps only causing a failure after a number of
on/off cycles. That's something that would be hard to diagnose!

I have modified my schematic to show using a 47uf cap being fed with a
1 amp fuse from the 2822. If I ever get a chance to actually finish up
my ubitx it will be interesting to see if the 1 amp fuse is sufficient.

tim ab0wr

On Thu, 01 Mar 2018 15:39:50 -0800
"Jerry Gaffke via Groups.Io" <jgaffke=yahoo.com@groups.io> wrote:

And subsequent replies have suggested this may not be sufficient.

Some seem to fry when plugging something into the headphone jack even
if there is no short to ground involved. Or when powering up the rig.
Our best guess now is that there are significant currents involved
when that 470uF cap suddenly has to charge up to Vcc/2 And that some
clone TDA2822's may be weaker than mainline manufacturers.

On Thu, Mar 1, 2018 at 03:31 pm, Christopher Miller wrote:


One of the first replies suggested not wiring the ring, and using a
mono to stereo adapter cable if stereo headphones are required. 
 

Re: TDA2822 ill treatment test!

Jerry Gaffke
 

Raj,

Good information, that 800ma when shorted.
There is likely a surge that is considerably higher while it charges the cap if you power up the rig
first with no headphones or speaker, then plug in a dead short.
Only there for maybe a couple milliseconds, so would need to use a scope to see it 
as a voltage across perhaps 0.1 ohm resistor that is in series with power to the chip.

Was that the stock TDA2822M that came with the uBitx?
Mine has a logo of "FCI" or maybe it's "FOI", where the middle character is filled in to where it is an almost solid circle.
It also says "PI1" and then below it says "TDA2822M".
I have no idea who makes that.

Post 43211 says there's some really bad clones masquerading as TDA2822M's.
There seems to be at least a half dozen different manufacturers of TDA2822 variants.
So any testing had best fully describe manufacturer and markings and such.

Tayda claims to have some  ST/SGS-Thomson TDA2822M's and TDA2822L's at cheap prices:
    https://www.taydaelectronics.com/catalogsearch/result/?q=tda2822
When you click through to the datasheets, you get either a 1995 ST datasheet (for the TDA2822M)
or a UTC datasheet (for the TDA2822L)    The "L" just means lead free.
A google search for TDA2822M finds this ST datasheet first, dated 2003 and marked "Obsolete":    http://www.st.com/content/ccc/resource/technical/document/datasheet/9e/18/f7/cd/2e/b8/43/62/CD00000134.pdf/files/CD00000134.pdf/jcr:content/translations/en.CD00000134.pdf  
I suspect the Tayda parts are not really ST. 

Yes, bridge mode would be nice for driving an internal speaker.
But not for driving anything external, were everyone would assume the jack shell is at ground potential.

Jerry



On Thu, Mar 1, 2018 at 07:22 pm, Raj vu2zap wrote:
Did some more tests.

Normal audio use the current was 60-70mA

Dead short with varied drive the current was 300-800mA. At 800mA the chip got hot!
The current did not go above 1A at any time.

I suspect there are TDA2822Ds masquerading as TDA2822M.

Raj
. . .

Re: B40 LM386 and µB TDA2822 and that 470µF Cap

Vince Vielhaber
 

So you're saying that if I want to use a pair of stereo headphones I have around here I should cut the connector off of it and wire it up to a mono plug? Yeah... I'll get right on that.

Vince.

On 03/01/2018 10:49 PM, Tim Gorman wrote:
If you insert a mono plug into a TRS jack the ring terminal of the
jack is almost always shorted to ground (i.e. the sleeve). If you wire
the output of the 2822 to both the tip and ring terminals and then
insert a mono plug there simply isn't any doubt that you are probably
going to short the output of the 2822 to ground. Bad things will
happen.

There is no reason to wire the output of the 2822 to both the tip and
the ring terminals. If you have a stereo headset then wire both headset
leads to tip of the plug and only wire up the tip lead on the socket.
Then if someone inadvertently plugs in a mono plug you won't short the
output of the 2822 to ground.

I agree that the large charging current going into the 470uf cap could
stress the 2822, perhaps only causing a failure after a number of
on/off cycles. That's something that would be hard to diagnose!

I have modified my schematic to show using a 47uf cap being fed with a
1 amp fuse from the 2822. If I ever get a chance to actually finish up
my ubitx it will be interesting to see if the 1 amp fuse is sufficient.

tim ab0wr

On Thu, 01 Mar 2018 15:39:50 -0800
"Jerry Gaffke via Groups.Io" <jgaffke=yahoo.com@groups.io> wrote:

And subsequent replies have suggested this may not be sufficient.

Some seem to fry when plugging something into the headphone jack even
if there is no short to ground involved. Or when powering up the rig.
Our best guess now is that there are significant currents involved
when that 470uF cap suddenly has to charge up to Vcc/2 And that some
clone TDA2822's may be weaker than mainline manufacturers.

On Thu, Mar 1, 2018 at 03:31 pm, Christopher Miller wrote:


One of the first replies suggested not wiring the ring, and using a
mono to stereo adapter cable if stereo headphones are required.


Re: B40 LM386 and µB TDA2822 and that 470µF Cap

Thomas Sharka
 

On Thursday, March 1, 2018 11:12 PM, Vince Vielhaber <vev@...> wrote:



So you're saying that if I want to use a pair of stereo headphones I
have around here I should cut the connector off of it and wire it up to
a mono plug?  Yeah...  I'll get right on that.

Vince.


On 03/01/2018 10:49 PM, Tim Gorman wrote:
> If you insert a mono plug into a TRS jack the ring terminal of the
> jack is almost always shorted to ground (i.e. the sleeve). If you wire
> the output of the 2822 to both the tip and ring terminals and then
> insert a mono plug there simply isn't any doubt that you are probably
> going to short the output of the 2822 to ground. Bad things will
> happen.
>
> There is no reason to wire the output of the 2822 to both the tip and
> the ring terminals. If you have a stereo headset then wire both headset
> leads to tip of the plug and only wire up the tip lead on the socket.
> Then if someone inadvertently plugs in a mono plug you won't short the
> output of the 2822 to ground.
>
> I agree that the large charging current going into the 470uf cap could
> stress the 2822, perhaps only causing a failure after a number of
> on/off cycles. That's something that would be hard to diagnose!
>
> I have modified my schematic to show using a 47uf cap being fed with a
> 1 amp fuse from the 2822. If I ever get a chance to actually finish up
> my ubitx it will be interesting to see if the 1 amp fuse is sufficient.
>
> tim ab0wr
>
> On Thu, 01 Mar 2018 15:39:50 -0800
> "Jerry Gaffke via Groups.Io" <jgaffke=yahoo.com@groups.io> wrote:
>
>> And subsequent replies have suggested this may not be sufficient.
>>
>> Some seem to fry when plugging something into the headphone jack even
>> if there is no short to ground involved. Or when powering up the rig.
>> Our best guess now is that there are significant currents involved
>> when that 470uF cap suddenly has to charge up to Vcc/2 And that some
>> clone TDA2822's may be weaker than mainline manufacturers.
>>
>> On Thu, Mar 1, 2018 at 03:31 pm, Christopher Miller wrote:
>>
>>>
>>> One of the first replies suggested not wiring the ring, and using a
>>> mono to stereo adapter cable if stereo headphones are required.
>>>
>>>
>
>
>
>

--
  Michigan VHF Corp.  http://www.nobucks.net/   http://www.CDupe.com/
                          http://www.metalworkingfun.com





Re: uBit Software

Michael Hagen
 

Thanks Jack,

Putting in a folder with the same name made it compile and load.

I don't have any thing hooked up, just on USB power.

First line of the LCD says "14.150k  50Hz ST"

Second says "  CW: 7.150.000"

No wires hooked up, I wonder what 14.150K means.

Might be a place to put call sign?  So it is garbage from eeprom?

TNX

Mike, WA6ISP

 
On 3/1/2018 6:15 PM, Michael Hagen wrote:

That file error ed on compile for me.  I had it all in the same directory, but not named that.

I knew that there was no way these files could all link, or know of each other.

I like programming, never could understand where the rules are for the environment. 

Thanks, I just think this stuff should follow standard Arduino protocol,  just one big file?

That's what made it so popular "C for Dummies".

Thanks Jack

Dinner and then back to it?

Mike, WA6ISP


On 3/1/2018 6:01 PM, Jack Purdum via Groups.Io wrote:
The file with setup() and loop() becomes the "main" INO file. I believe that file is named ubitx_20.ino. This means you must place all of those files in a directory named ubitx_20. Personally, I wish Lee had not done it this way since making them all INO files means that no type checking is performed on functions during the compile. It would be better to keep the one INO file and rename the others to *.cpp (i.e., C++) files, which would reinstate type checking.

Jack, W8TEE



From: Michael Hagen <motdog@...>
To: BITX20@groups.io
Sent: Thursday, March 1, 2018 8:53 PM
Subject: Re: [BITX20]uBit Software

I was looking at KD8CEC for uBit.
But there are a lot of ino files when I download?  So I am lost.
Any instructions what file to load into Arduino IDE ?    I don't know what I am doing looking at the downloaded files.
Is there a name for the latest version of a file that is the whole thing?
I tried, just get errors.   So I need step by step instructions.
So where to go, what file to load into Nano?  If there are multiple ino files, how does it know of the others?
If not CEC, what should I load?
Thanks
Mike, WA6ISP
 



-- 
Mike Hagen, WA6ISP
10917 Bryant Street
Yucaipa, Ca. 92399
(909) 918-0058
PayPal ID  "MotDog@..."
Mike@...

-- 
Mike Hagen, WA6ISP
10917 Bryant Street
Yucaipa, Ca. 92399
(909) 918-0058
PayPal ID  "MotDog@..."
Mike@...

Re: B40 LM386 and µB TDA2822 and that 470µF Cap

Vince Vielhaber
 

Ever cut the connector off of a pair of them and try to wire on a new one? The point, that you obviously missed, wasn't that headphones are cheap, it's that there's no reason to do what Tim was suggesting and that you can wire up to the tip and ring and have it work with both stereo and mono headphones.

Vince.

On 03/01/2018 11:17 PM, Thomas Sharka via Groups.Io wrote:
Trendy Headphones Stereo 3.5mm Plug In-Ear Earbuds Earphones Headset For
Phones | eBay
<https://www.ebay.com/itm/Trendy-Headphones-Stereo-3-5mm-Plug-In-Ear-Earbuds-Earphones-Headset-For-Phones-/271924189930?_trksid=p2385738.m4383.l4275.c10>

Headphones are cheap. You can find them at the Dollar Store.
$ 0.99




Trendy Headphones Stereo 3.5mm Plug In-Ear Earbuds Earphones Headset
For Ph...

Headset Type: In-Ear. Connection: 3.5 mm Stereo Plug. Cable Length:
110cm/43.30"(Approx.). High quality in ...


<https://www.ebay.com/itm/Trendy-Headphones-Stereo-3-5mm-Plug-In-Ear-Earbuds-Earphones-Headset-For-Phones-/271924189930?_trksid=p2385738.m4383.l4275.c10>




Sent from Yahoo Mail. Get the app <https://yho.com/148vdq>


On Thursday, March 1, 2018 11:12 PM, Vince Vielhaber <vev@...>
wrote:



So you're saying that if I want to use a pair of stereo headphones I
have around here I should cut the connector off of it and wire it up to
a mono plug? Yeah... I'll get right on that.

Vince.


On 03/01/2018 10:49 PM, Tim Gorman wrote:
If you insert a mono plug into a TRS jack the ring terminal of the
jack is almost always shorted to ground (i.e. the sleeve). If you wire
the output of the 2822 to both the tip and ring terminals and then
insert a mono plug there simply isn't any doubt that you are probably
going to short the output of the 2822 to ground. Bad things will
happen.

There is no reason to wire the output of the 2822 to both the tip and
the ring terminals. If you have a stereo headset then wire both headset
leads to tip of the plug and only wire up the tip lead on the socket.
Then if someone inadvertently plugs in a mono plug you won't short the
output of the 2822 to ground.

I agree that the large charging current going into the 470uf cap could
stress the 2822, perhaps only causing a failure after a number of
on/off cycles. That's something that would be hard to diagnose!

I have modified my schematic to show using a 47uf cap being fed with a
1 amp fuse from the 2822. If I ever get a chance to actually finish up
my ubitx it will be interesting to see if the 1 amp fuse is sufficient.

tim ab0wr

On Thu, 01 Mar 2018 15:39:50 -0800
"Jerry Gaffke via Groups.Io" <jgaffke=yahoo.com@groups.io
<mailto:yahoo.com@groups.io>> wrote:

And subsequent replies have suggested this may not be sufficient.

Some seem to fry when plugging something into the headphone jack even
if there is no short to ground involved. Or when powering up the rig.
Our best guess now is that there are significant currents involved
when that 470uF cap suddenly has to charge up to Vcc/2 And that some
clone TDA2822's may be weaker than mainline manufacturers.

On Thu, Mar 1, 2018 at 03:31 pm, Christopher Miller wrote:


One of the first replies suggested not wiring the ring, and using a
mono to stereo adapter cable if stereo headphones are required.



--
Michigan VHF Corp. http://www.nobucks.net/ <http://www.nobucks.net/>
http://www.CDupe.com/ <http://www.cdupe.com/>
http://www.metalworkingfun.com
<http://www.metalworkingfun.com/>





Re: B40 LM386 and µB TDA2822 and that 470µF Cap

Thomas Sharka
 

On Thursday, March 1, 2018 11:22 PM, Vince Vielhaber <vev@...> wrote:


Ever cut the connector off of a pair of them and try to wire on a new
one?  The point, that you obviously missed, wasn't that headphones are
cheap, it's that there's no reason to do what Tim was suggesting and
that you can wire up to the tip and ring and have it work with both
stereo and mono headphones.

Vince.



On 03/01/2018 11:17 PM, Thomas Sharka via Groups.Io wrote:
> Trendy Headphones Stereo 3.5mm Plug In-Ear Earbuds Earphones Headset For
> Phones | eBay
> <https://www.ebay.com/itm/Trendy-Headphones-Stereo-3-5mm-Plug-In-Ear-Earbuds-Earphones-Headset-For-Phones-/271924189930?_trksid=p2385738.m4383.l4275.c10>
>
> Headphones are cheap. You can find them at the Dollar Store.
> $ 0.99    
>
>    
>
>
>    Trendy Headphones Stereo 3.5mm Plug In-Ear Earbuds Earphones Headset
>    For Ph...
>
> Headset Type: In-Ear. Connection: 3.5 mm Stereo Plug. Cable Length:
> 110cm/43.30"(Approx.). High quality in ...
>    
>
> <https://www.ebay.com/itm/Trendy-Headphones-Stereo-3-5mm-Plug-In-Ear-Earbuds-Earphones-Headset-For-Phones-/271924189930?_trksid=p2385738.m4383.l4275.c10>
>
>
>
>
> Sent from Yahoo Mail. Get the app <https://yho.com/148vdq>
>
>
> On Thursday, March 1, 2018 11:12 PM, Vince Vielhaber <vev@...>
> wrote:
>
>
>
> So you're saying that if I want to use a pair of stereo headphones I
> have around here I should cut the connector off of it and wire it up to
> a mono plug?  Yeah...  I'll get right on that.
>
> Vince.
>
>
> On 03/01/2018 10:49 PM, Tim Gorman wrote:
>> If you insert a mono plug into a TRS jack the ring terminal of the
>> jack is almost always shorted to ground (i.e. the sleeve). If you wire
>> the output of the 2822 to both the tip and ring terminals and then
>> insert a mono plug there simply isn't any doubt that you are probably
>> going to short the output of the 2822 to ground. Bad things will
>> happen.
>>
>> There is no reason to wire the output of the 2822 to both the tip and
>> the ring terminals. If you have a stereo headset then wire both headset
>> leads to tip of the plug and only wire up the tip lead on the socket.
>> Then if someone inadvertently plugs in a mono plug you won't short the
>> output of the 2822 to ground.
>>
>> I agree that the large charging current going into the 470uf cap could
>> stress the 2822, perhaps only causing a failure after a number of
>> on/off cycles. That's something that would be hard to diagnose!
>>
>> I have modified my schematic to show using a 47uf cap being fed with a
>> 1 amp fuse from the 2822. If I ever get a chance to actually finish up
>> my ubitx it will be interesting to see if the 1 amp fuse is sufficient.
>>
>> tim ab0wr
>>
>> On Thu, 01 Mar 2018 15:39:50 -0800
>> "Jerry Gaffke via Groups.Io" <jgaffke=yahoo.com@groups.io
> <mailto:yahoo.com@groups.io>> wrote:
>>
>>> And subsequent replies have suggested this may not be sufficient.
>>>
>>> Some seem to fry when plugging something into the headphone jack even
>>> if there is no short to ground involved. Or when powering up the rig.
>>> Our best guess now is that there are significant currents involved
>>> when that 470uF cap suddenly has to charge up to Vcc/2 And that some
>>> clone TDA2822's may be weaker than mainline manufacturers.
>>>
>>> On Thu, Mar 1, 2018 at 03:31 pm, Christopher Miller wrote:
>>>
>>>>
>>>> One of the first replies suggested not wiring the ring, and using a
>>>> mono to stereo adapter cable if stereo headphones are required.
>>>>
>>>>
>>
>>
>>
>>
>
> --
>  Michigan VHF Corp.  http://www.nobucks.net/ <http://www.nobucks.net/>
> http://www.CDupe.com/ <http://www.cdupe.com/>
>                          http://www.metalworkingfun.com
> <http://www.metalworkingfun.com/>
>
>
>
>
>
>

--
  Michigan VHF Corp.  http://www.nobucks.net/   http://www.CDupe.com/
                          http://www.metalworkingfun.com





Re: B40 LM386 and µB TDA2822 and that 470µF Cap

Vince Vielhaber
 

Well that sure explains why you missed the point. Thanks for clarifying.

Vince.

On 03/01/2018 11:28 PM, Thomas Sharka via Groups.Io wrote:
Often.

http://3.bp.blogspot.com/-9FHusouOVIE/T_RT2O6Ul-I/AAAAAAAAAfE/U-l2_0i7N78/s1600/IMAG0090.jpg



Sent from Yahoo Mail. Get the app <https://yho.com/148vdq>


On Thursday, March 1, 2018 11:22 PM, Vince Vielhaber <vev@...>
wrote:


Ever cut the connector off of a pair of them and try to wire on a new
one? The point, that you obviously missed, wasn't that headphones are
cheap, it's that there's no reason to do what Tim was suggesting and
that you can wire up to the tip and ring and have it work with both
stereo and mono headphones.

Vince.



On 03/01/2018 11:17 PM, Thomas Sharka via Groups.Io wrote:
Trendy Headphones Stereo 3.5mm Plug In-Ear Earbuds Earphones Headset For
Phones | eBay
<https://www.ebay.com/itm/Trendy-Headphones-Stereo-3-5mm-Plug-In-Ear-Earbuds-Earphones-Headset-For-Phones-/271924189930?_trksid=p2385738.m4383.l4275.c10>

Headphones are cheap. You can find them at the Dollar Store.
$ 0.99




Trendy Headphones Stereo 3.5mm Plug In-Ear Earbuds Earphones Headset
For Ph...

Headset Type: In-Ear. Connection: 3.5 mm Stereo Plug. Cable Length:
110cm/43.30"(Approx.). High quality in ...


<https://www.ebay.com/itm/Trendy-Headphones-Stereo-3-5mm-Plug-In-Ear-Earbuds-Earphones-Headset-For-Phones-/271924189930?_trksid=p2385738.m4383.l4275.c10>




Sent from Yahoo Mail. Get the app <https://yho.com/148vdq>


On Thursday, March 1, 2018 11:12 PM, Vince Vielhaber <vev@...
<mailto:vev@...>>
wrote:



So you're saying that if I want to use a pair of stereo headphones I
have around here I should cut the connector off of it and wire it up to
a mono plug? Yeah... I'll get right on that.

Vince.


On 03/01/2018 10:49 PM, Tim Gorman wrote:
If you insert a mono plug into a TRS jack the ring terminal of the
jack is almost always shorted to ground (i.e. the sleeve). If you wire
the output of the 2822 to both the tip and ring terminals and then
insert a mono plug there simply isn't any doubt that you are probably
going to short the output of the 2822 to ground. Bad things will
happen.

There is no reason to wire the output of the 2822 to both the tip and
the ring terminals. If you have a stereo headset then wire both headset
leads to tip of the plug and only wire up the tip lead on the socket.
Then if someone inadvertently plugs in a mono plug you won't short the
output of the 2822 to ground.

I agree that the large charging current going into the 470uf cap could
stress the 2822, perhaps only causing a failure after a number of
on/off cycles. That's something that would be hard to diagnose!

I have modified my schematic to show using a 47uf cap being fed with a
1 amp fuse from the 2822. If I ever get a chance to actually finish up
my ubitx it will be interesting to see if the 1 amp fuse is sufficient.

tim ab0wr

On Thu, 01 Mar 2018 15:39:50 -0800
"Jerry Gaffke via Groups.Io" <jgaffke=yahoo.com@groups.io
<mailto:yahoo.com@groups.io>
<mailto:yahoo.com@groups.io <mailto:yahoo.com@groups.io>>> wrote:

And subsequent replies have suggested this may not be sufficient.

Some seem to fry when plugging something into the headphone jack even
if there is no short to ground involved. Or when powering up the rig.
Our best guess now is that there are significant currents involved
when that 470uF cap suddenly has to charge up to Vcc/2 And that some
clone TDA2822's may be weaker than mainline manufacturers.

On Thu, Mar 1, 2018 at 03:31 pm, Christopher Miller wrote:


One of the first replies suggested not wiring the ring, and using a
mono to stereo adapter cable if stereo headphones are required.



--
Michigan VHF Corp. http://www.nobucks.net/
<http://www.nobucks.net/><http://www.nobucks.net/>
http://www.CDupe.com/ <http://www.cdupe.com/><http://www.cdupe.com/>
http://www.metalworkingfun.com
<http://www.metalworkingfun.com/>
<http://www.metalworkingfun.com/>





--
Michigan VHF Corp. http://www.nobucks.net/ <http://www.nobucks.net/>
http://www.CDupe.com/ <http://www.cdupe.com/>
http://www.metalworkingfun.com
<http://www.metalworkingfun.com/>





Re: uBit Software

Mike Woods
 

Mike

You obviously got the software to install on your uBITx!

That 14.150k is the frequency of your other VFO (if you are on VFO A then that is the frequency of VFO B).  This is handy if you are working SPLIT which is provided for in the KD8CEC software.  A real contesting feature especially for 40m ...

If you also download the Windows (or Linux) software developed by Ian KD8CEC called "UBitx Manager" - see the link on ubitx.net homepage, then you can configure this top line how you want it.   From memory that includes putting your callsign there  if you are sufficiently vain Hi Hi!

73 Mike ZL1AXG

On 2/03/18 5:21 PM, Michael Hagen wrote:

Thanks Jack,

Putting in a folder with the same name made it compile and load.

I don't have any thing hooked up, just on USB power.

First line of the LCD says "14.150k  50Hz ST"

Second says "  CW: 7.150.000"

No wires hooked up, I wonder what 14.150K means.

Might be a place to put call sign?  So it is garbage from eeprom?

TNX

Mike, WA6ISP

 
On 3/1/2018 6:15 PM, Michael Hagen wrote:

That file error ed on compile for me.  I had it all in the same directory, but not named that.

I knew that there was no way these files could all link, or know of each other.

I like programming, never could understand where the rules are for the environment. 

Thanks, I just think this stuff should follow standard Arduino protocol,  just one big file?

That's what made it so popular "C for Dummies".

Thanks Jack

Dinner and then back to it?

Mike, WA6ISP


On 3/1/2018 6:01 PM, Jack Purdum via Groups.Io wrote:
The file with setup() and loop() becomes the "main" INO file. I believe that file is named ubitx_20.ino. This means you must place all of those files in a directory named ubitx_20. Personally, I wish Lee had not done it this way since making them all INO files means that no type checking is performed on functions during the compile. It would be better to keep the one INO file and rename the others to *.cpp (i.e., C++) files, which would reinstate type checking.

Jack, W8TEE



From: Michael Hagen <motdog@...>
To: BITX20@groups.io
Sent: Thursday, March 1, 2018 8:53 PM
Subject: Re: [BITX20]uBit Software

I was looking at KD8CEC for uBit.
But there are a lot of ino files when I download?  So I am lost.
Any instructions what file to load into Arduino IDE ?    I don't know what I am doing looking at the downloaded files.
Is there a name for the latest version of a file that is the whole thing?
I tried, just get errors.   So I need step by step instructions.
So where to go, what file to load into Nano?  If there are multiple ino files, how does it know of the others?
If not CEC, what should I load?
Thanks
Mike, WA6ISP
 



-- 
Mike Hagen, WA6ISP
10917 Bryant Street
Yucaipa, Ca. 92399
(909) 918-0058
PayPal ID  "MotDog@..."
Mike@...

-- 
Mike Hagen, WA6ISP
10917 Bryant Street
Yucaipa, Ca. 92399
(909) 918-0058
PayPal ID  "MotDog@..."
Mike@...


--
Mike Woods
mhwoods@...

Re: B40 LM386 and µB TDA2822 and that 470µF Cap

Thomas Sharka
 

Yes, all those tiny, fiddly wires! How could anyone ever manage? Good thing that soldering SMD parts the size of a grain of pepper is so easy.
 


Sent from Yahoo Mail. Get the app


On Thursday, March 1, 2018 11:34 PM, Vince Vielhaber <vev@...> wrote:


Well that sure explains why you missed the point.  Thanks for clarifying.

Vince.



On 03/01/2018 11:28 PM, Thomas Sharka via Groups.Io wrote:
> Often.
>
> http://3.bp.blogspot.com/-9FHusouOVIE/T_RT2O6Ul-I/AAAAAAAAAfE/U-l2_0i7N78/s1600/IMAG0090.jpg
>
>
>
> Sent from Yahoo Mail. Get the app <https://yho.com/148vdq>
>
>
> On Thursday, March 1, 2018 11:22 PM, Vince Vielhaber <vev@...>
> wrote:
>
>
> Ever cut the connector off of a pair of them and try to wire on a new
> one?  The point, that you obviously missed, wasn't that headphones are
> cheap, it's that there's no reason to do what Tim was suggesting and
> that you can wire up to the tip and ring and have it work with both
> stereo and mono headphones.
>
> Vince.
>
>
>
> On 03/01/2018 11:17 PM, Thomas Sharka via Groups.Io wrote:
>> Trendy Headphones Stereo 3.5mm Plug In-Ear Earbuds Earphones Headset For
>> Phones | eBay
>>
> <https://www.ebay.com/itm/Trendy-Headphones-Stereo-3-5mm-Plug-In-Ear-Earbuds-Earphones-Headset-For-Phones-/271924189930?_trksid=p2385738.m4383.l4275.c10>
>>
>> Headphones are cheap. You can find them at the Dollar Store.
>> $ 0.99
>>
>>
>>
>>
>>    Trendy Headphones Stereo 3.5mm Plug In-Ear Earbuds Earphones Headset
>>    For Ph...
>>
>> Headset Type: In-Ear. Connection: 3.5 mm Stereo Plug. Cable Length:
>> 110cm/43.30"(Approx.). High quality in ...
>>
>>
>>
> <https://www.ebay.com/itm/Trendy-Headphones-Stereo-3-5mm-Plug-In-Ear-Earbuds-Earphones-Headset-For-Phones-/271924189930?_trksid=p2385738.m4383.l4275.c10>
>>
>>
>>
>>
>> Sent from Yahoo Mail. Get the app <https://yho.com/148vdq>
>>
>>
>> On Thursday, March 1, 2018 11:12 PM, Vince Vielhaber <vev@...
> <mailto:vev@...>>
>> wrote:
>>
>>
>>
>> So you're saying that if I want to use a pair of stereo headphones I
>> have around here I should cut the connector off of it and wire it up to
>> a mono plug?  Yeah...  I'll get right on that.
>>
>> Vince.
>>
>>
>> On 03/01/2018 10:49 PM, Tim Gorman wrote:
>>> If you insert a mono plug into a TRS jack the ring terminal of the
>>> jack is almost always shorted to ground (i.e. the sleeve). If you wire
>>> the output of the 2822 to both the tip and ring terminals and then
>>> insert a mono plug there simply isn't any doubt that you are probably
>>> going to short the output of the 2822 to ground. Bad things will
>>> happen.
>>>
>>> There is no reason to wire the output of the 2822 to both the tip and
>>> the ring terminals. If you have a stereo headset then wire both headset
>>> leads to tip of the plug and only wire up the tip lead on the socket.
>>> Then if someone inadvertently plugs in a mono plug you won't short the
>>> output of the 2822 to ground.
>>>
>>> I agree that the large charging current going into the 470uf cap could
>>> stress the 2822, perhaps only causing a failure after a number of
>>> on/off cycles. That's something that would be hard to diagnose!
>>>
>>> I have modified my schematic to show using a 47uf cap being fed with a
>>> 1 amp fuse from the 2822. If I ever get a chance to actually finish up
>>> my ubitx it will be interesting to see if the 1 amp fuse is sufficient.
>>>
>>> tim ab0wr
>>>
>>> On Thu, 01 Mar 2018 15:39:50 -0800
>>> "Jerry Gaffke via Groups.Io" <jgaffke=yahoo.com@groups.io
> <mailto:yahoo.com@groups.io>
>> <mailto:yahoo.com@groups.io <mailto:yahoo.com@groups.io>>> wrote:
>>>
>>>> And subsequent replies have suggested this may not be sufficient.
>>>>
>>>> Some seem to fry when plugging something into the headphone jack even
>>>> if there is no short to ground involved. Or when powering up the rig.
>>>> Our best guess now is that there are significant currents involved
>>>> when that 470uF cap suddenly has to charge up to Vcc/2 And that some
>>>> clone TDA2822's may be weaker than mainline manufacturers.
>>>>
>>>> On Thu, Mar 1, 2018 at 03:31 pm, Christopher Miller wrote:
>>>>
>>>>>
>>>>> One of the first replies suggested not wiring the ring, and using a
>>>>> mono to stereo adapter cable if stereo headphones are required.
>>>>>
>>>>>
>>>
>>>
>>>
>>>
>>
>> --
>>  Michigan VHF Corp.  http://www.nobucks.net/
> <http://www.nobucks.net/><http://www.nobucks.net/>
>> http://www.CDupe.com/ <http://www.cdupe.com/><http://www.cdupe.com/>
>>                          http://www.metalworkingfun.com
> <http://www.metalworkingfun.com/>
>> <http://www.metalworkingfun.com/>
>>
>>
>>
>>
>>
>>
>
> --
>  Michigan VHF Corp.  http://www.nobucks.net/ <http://www.nobucks.net/>
> http://www.CDupe.com/ <http://www.cdupe.com/>
>                          http://www.metalworkingfun.com
> <http://www.metalworkingfun.com/>
>
>
>
>
>
>

--
  Michigan VHF Corp.  http://www.nobucks.net/   http://www.CDupe.com/
                          http://www.metalworkingfun.com





Re: uBITX - U1 Getting Fried - possible cause #ubitx

Dexter N Muir
 

Yes, Raj, bridge mode gets you more, but likely more than twice! While one 'phase' is going positive, the other is going negative. W=E^2/R, double E (Voltage) gives double squared (4x) power. That was the impression I had gained from earlier discussion. More likely is the In/Out-rush current, instantaneous fubar! The heat and pyrotechnics would be after-effects. Less C for less Bass would be sane, a series R likewise - the few dB loss would hardly matter - Bitx-40's sidetone-at-the-speaker arrangement would be an indication...

73
Dex ZL2DEX

Re: TDA2822 ill treatment test!

 

Emacs!


At 02-03-2018, you wrote:
Raj,

Good information, that 800ma when shorted.
There is likely a surge that is considerably higher while it charges the cap if you power up the rig
first with no headphones or speaker, then plug in a dead short.
Only there for maybe a couple milliseconds, so would need to use a scope to see it
as a voltage across perhaps 0.1 ohm resistor that is in series with power to the chip.

Was that the stock TDA2822M that came with the uBitx?
Mine has a logo of "FCI" or maybe it's "FOI", where the middle character is filled in to where it is an almost solid circle.
It also says "PI1" and then below it says "TDA2822M".
I have no idea who makes that.

Post 43211 says there's some really bad clones masquerading as TDA2822M's.
There seems to be at least a half dozen different manufacturers of TDA2822 variants.
So any testing had best fully describe manufacturer and markings and such.

Tayda claims to have some  ST/SGS-Thomson TDA2822M's and TDA2822L's at cheap prices:
    https://www.taydaelectronics.com/catalogsearch/result/?q=tda2822
When you click through to the datasheets, you get either a 1995 ST datasheet (for the TDA2822M)
or a UTC datasheet (for the TDA2822L)    The "L" just means lead free.
A google search for TDA2822M finds this ST datasheet first, dated 2003 and marked "Obsolete":    http://www.st.com/content/ccc/resource/technical/document/datasheet/9e/18/f7/cd/2e/b8/43/62/CD00000134.pdf/files/CD00000134.pdf/jcr:content/translations/en.CD00000134.pdf  
I suspect the Tayda parts are not really ST.

Yes, bridge mode would be nice for driving an internal speaker.
But not for driving anything external, were everyone would assume the jack shell is at ground potential.

Jerry



On Thu, Mar 1, 2018 at 07:22 pm, Raj vu2zap wrote:
Did some more tests.

Normal audio use the current was 60-70mA

Dead short with varied drive the current was 300-800mA. At 800mA the chip got hot!
The current did not go above 1A at any time.

I suspect there are TDA2822Ds masquerading as TDA2822M.

Raj
. . .

Re: B40 LM386 and µB TDA2822 and that 470µF Cap

Randy
 

Re: uBit Software

Michael Hagen
 

Wow, I can't believe the code he came up with.   What a Whiz he must be!  To compile the code you have to put it in a folder with the main name same as the ino file.  But, you have to know the that name?  Jack came up with ubitx_20.  It worked.

So the VFOs can be on other bands?  You can change bands by picking the other VFO?   Is there a description of this top line somewhere or do you have to run the configuration manager?  I  looked thru the code, thinking I could find a description of what is on each line.  Could not figure it out much.  Also in the code he discusses a pot for tuning?   Might be old stuff?

Thanks for the help,  I will look for the configuration manager.

Mike


On 3/1/2018 8:36 PM, Mike Woods wrote:
Mike

You obviously got the software to install on your uBITx!

That 14.150k is the frequency of your other VFO (if you are on VFO A then that is the frequency of VFO B).  This is handy if you are working SPLIT which is provided for in the KD8CEC software.  A real contesting feature especially for 40m ...

If you also download the Windows (or Linux) software developed by Ian KD8CEC called "UBitx Manager" - see the link on ubitx.net homepage, then you can configure this top line how you want it.   From memory that includes putting your callsign there  if you are sufficiently vain Hi Hi!

73 Mike ZL1AXG

On 2/03/18 5:21 PM, Michael Hagen wrote:

Thanks Jack,

Putting in a folder with the same name made it compile and load.

I don't have any thing hooked up, just on USB power.

First line of the LCD says "14.150k  50Hz ST"

Second says "  CW: 7.150.000"

No wires hooked up, I wonder what 14.150K means.

Might be a place to put call sign?  So it is garbage from eeprom?

TNX

Mike, WA6ISP

 
On 3/1/2018 6:15 PM, Michael Hagen wrote:

That file error ed on compile for me.  I had it all in the same directory, but not named that.

I knew that there was no way these files could all link, or know of each other.

I like programming, never could understand where the rules are for the environment. 

Thanks, I just think this stuff should follow standard Arduino protocol,  just one big file?

That's what made it so popular "C for Dummies".

Thanks Jack

Dinner and then back to it?

Mike, WA6ISP


On 3/1/2018 6:01 PM, Jack Purdum via Groups.Io wrote:
The file with setup() and loop() becomes the "main" INO file. I believe that file is named ubitx_20.ino. This means you must place all of those files in a directory named ubitx_20. Personally, I wish Lee had not done it this way since making them all INO files means that no type checking is performed on functions during the compile. It would be better to keep the one INO file and rename the others to *.cpp (i.e., C++) files, which would reinstate type checking.

Jack, W8TEE



From: Michael Hagen <motdog@...>
To: BITX20@groups.io
Sent: Thursday, March 1, 2018 8:53 PM
Subject: Re: [BITX20]uBit Software

I was looking at KD8CEC for uBit.
But there are a lot of ino files when I download?  So I am lost.
Any instructions what file to load into Arduino IDE ?    I don't know what I am doing looking at the downloaded files.
Is there a name for the latest version of a file that is the whole thing?
I tried, just get errors.   So I need step by step instructions.
So where to go, what file to load into Nano?  If there are multiple ino files, how does it know of the others?
If not CEC, what should I load?
Thanks
Mike, WA6ISP
 



-- 
Mike Hagen, WA6ISP
10917 Bryant Street
Yucaipa, Ca. 92399
(909) 918-0058
PayPal ID  "MotDog@..."
Mike@...

-- 
Mike Hagen, WA6ISP
10917 Bryant Street
Yucaipa, Ca. 92399
(909) 918-0058
PayPal ID  "MotDog@..."
Mike@...


--
Mike Woods
mhwoods@...

-- 
Mike Hagen, WA6ISP
10917 Bryant Street
Yucaipa, Ca. 92399
(909) 918-0058
PayPal ID  "MotDog@..."
Mike@...

Re: uBITX - U1 Getting Fried - possible cause #ubitx

 

Dex,

Best solution would be a 6-9V regulator for the TDA. This would current limiter too..
Perhaps in uBitxV2!

Raj

At 02-03-2018, you wrote:
Yes, Raj, bridge mode gets you more, but likely more than twice! While one 'phase' is going positive, the other is going negative. W=E^2/R, double E (Voltage) gives double squared (4x) power. That was the impression I had gained from earlier discussion. More likely is the In/Out-rush current, instantaneous fubar! The heat and pyrotechnics would be after-effects. Less C for less Bass would be sane, a series R likewise - the few dB loss would hardly matter - Bitx-40's sidetone-at-the-speaker arrangement would be an indication...

73
Dex ZL2DEX

Re: uBITX - U1 Getting Fried - possible cause #ubitx

RCC WB5YYM
 

Could a person add an 8ohm resistor across the speaker jack on the NC pin? When you plug in the speaker it would open up that load and the amp would see the speaker.

Re: B40 LM386 and µB TDA2822 and that 470µF Cap

Jerry Gaffke
 

They're worth a try, maybe you managed to get some good ones.
But in my experience, anything under about $10 in headphones is not worth the bother.
Extremely low fidelity, to the point of not being good enough to listen to the news.

I agree with Vince, not trivial to put a new connector on most headphones these days.
Try it.
Better than hacking your $1 headphones is a mono to stereo adapter plug:
    https://www.monoprice.com/product?p_id=7128
As suggested in a post a couple days ago.

Not yet clear if avoiding shorts is sufficient to keep this chip from failing.
Some reports of plugging in stereo headphones causing it to fail.

Jerry


On Thu, Mar 1, 2018 at 08:17 pm, Thomas Sharka wrote:
Headphones are cheap. You can find them at the Dollar Store.