Date   
Re: Component in schematic

Tim Gorman
 

It would appear you are looking at the operating winding on a relay. It
would look like a coil of wire around a piece of iron that would pull
the relay springs to move through magnetism.

The diode and capacitor are to prevent voltage spikes when power is
removed from the relay.

tim ab0wr

On Fri, 02 Mar 2018 04:19:15 -0800
qonita.salimah@... wrote:

Sorry, I'm try to search eagle library for this component. But seems
find nothing in the internet..

The first picture is a trafo with  6 pins, and the other is look like
coil. Need help here

Thank you :)

Re: U1 fried

Jerry Gaffke
 

There's a photo at the end of that webpage where I can just barely read a "CX" logo on their problematic TDA2822.
So WX and CX are perhaps best avoided?
I have no idea who "CX" is, though possible what I am seeing is a clone of a Sony part number? (google Sony CX767)

Perhaps Steve could tell us more about how those parts are marked.

Jerry, KE7ER


On Thu, Mar 1, 2018 at 02:23 pm, G1KQH wrote:
Recently I found some TDA2822's on ebay from China, I got the GQRP club to purchase a batch ( I bought 50 too ). Tony Fishpool (G4WIF) setup up a test and found although they worked well at low Volts they got hot over 7V!:
His findings are made public here on his website here: http://www.fishpool.org.uk/audioamp.htm
Food for thought!
73 Steve
GQRP 11049
http://g1kqh.blogspot.co.uk/

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

Tim Gorman
 

Dave,

It depends on how the radio is designed. If the radio uses a
well-designed mono jack, one with a switched tip lead, it probably won't
hurt anything. When I say switched, with no plug inserted the output is
connected to a switched terminal on the jack that is connected to an
internal speaker. When you insert the plug the tip is disconnected from
the internal speaker by the action of the plug opening the switch. The
tip lead is then connected to the tip on the plug.

This is for mono type jacks. I have about three of these that I rescued
from defunct 60's style transistor radios. I plan to use one of them
for the speaker connection in my ubitx. With no plug in the jack, the
internal speaker will be activated. When the plug is inserted the sound
will be redirected out the plug.

The worst thing that might happen here is that the internal speaker and
the external unit might be momentarily connected in parallel. I doubt
this will hurt the tda2822 very much.

tim ab0wr

On Fri, 2 Mar 2018 03:09:01 -0500
"David Wilcox via Groups.Io" <Djwilcox01=yahoo.com@groups.io> wrote:

I know that we get away with plugging and unplugging things hot on
most of our radios but as for me I will turn off the radio before
making any changes. Any thoughts on that?

Dave K8WPE

On Mar 1, 2018, at 10:49 PM, Tim Gorman <tgorman2@...> 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

Tim Gorman
 

Vince,

You missed the point. If you wire the tda2822 to both the tip and the
ring and then plug in a mono headphone you *will*, in almost every
case, short the output of the tda2822 to ground via the ring lead.

You will melt the tda2822 sooner or later by doing so - plus get
nothing in the headphone.

tim ab0wr

On Thu, 1 Mar 2018 23:22:48 -0500
"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.



--
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<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

Tim Gorman
 

You can buy cheap adapters that do the same thing. Connect both headset
leads to the tip.

Here's a gold plated one!

www.amazon.com/Monoprice-107128-Stereo-Adaptor-Plated/dp/B002N1XMPO/ref=sr_1_3?ie=UTF8&qid=1520006425&sr=8-3&keywords=mono+to+stereo+3.5mm+adapter

tim ab0wr

On Thu, 1 Mar 2018 23:12:41 -0500
"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.



Re: Bitx40 with Raduino stopped working #bitx40help #bitx40

Allard PE1NWL
 

Also check that your ground connection to the Raduino is correct.

If your GND to the Raduino is OK, but you're still getting only 0.04V out
of the regulator, then
- either the regulator output is somehow shorted. Inspect the Raduino
board, check for any shorts, check capacitor C3 (1 uF).
- or the regulator is defective (replace it)

On Fri, March 2, 2018 16:20, Jamie Dean - KW4XR wrote:
On 20v range I'm getting 0.04 volts

Re: Bitx40 with Raduino stopped working #bitx40help #bitx40

Jamie Dean
 

Input is 12.58 volts output is 0.04 volts.
Checked multiple times. It seems it might have gone out?

73,
Jamie - KW4XR

Re: TDA2822 ill treatment test! Photo of blown TDA

Jerry Gaffke
 

So two reports of "WX" TDA2822M's going up in smoke.
I'm very very curious if all blown chips turn out to be WX branded,
and none are FCI.
 
There is a website for  WX:  http://www.wx-ic.com/Cn/Product_Detail_Images.aspx?id=105303&UserInfo_ID=216432&CorpProductImages_ID=106897
though I can't find a datasheet.
Probably a 3'rd tier clone manufacturer.

May need either a chip from a "good" manufacturer whoever that might be,
or a regulator to make it a max of 6v or so into the TDA2822.

Jerry, KE7ER



On Fri, Mar 2, 2018 at 06:59 am, Michael Aiello wrote:
Mine failed immediately after apply power to the board after wiring up the power connector. Nothing else was connected. There was a loud crack, and a puff of magic smoke, then silence.

Re: Bitx40 with Raduino stopped working #bitx40help #bitx40

Michael Shreeve
 

Could you measure each of the pins on the regulator ?  Carefully. 

On Fri, Mar 2, 2018 at 7:20 AM, Jamie Dean - KW4XR <jdean72985@...> wrote:
On 20v range I'm getting 0.04 volts




--
Michael Shreeve N6GRG
15901 Cloverdale Road
Anderson, CA 96007
530-410-8678
"Don't worry about a thing, 'Cause every little thing gonna be all right!" -Bob Marley



Re: Bitx40 with Raduino stopped working #bitx40help #bitx40

Jamie Dean
 

On 20v range I'm getting 0.04 volts

Re: BitX Volume Knob 3D Print File

_Dave_ AD0B
 

I printed knobs for my bitx40. The long shafts make the knobs thick. Thought about cutting the shafts down but didn't want to chance damaging the pots.ng the shafts down but don't want to damage 
The tuning knob I have now is offset with a finger dish. I like it a lot.

Re: Surplus Case from Skycraft Parts #ubitx #bitx40

Stephen Johnson <stephenpjohnsonsr@...>
 

I took your tip and bought several of these boxes by mail. There are different models. One has four nice BNC connectors. The other type has some four pin devices with a dot near one of the pins near the input connector that I  can’t identify. They are marked “107”. I thought they might be rf amps? Any help?
Steve N2FT


On Sat, Feb 17, 2018 at 2:11 PM w4rjp <pearsall20@...> wrote:
Last Saturday went to the Orlando, Fl Hamfest looking for a uBitx case.  Despite all the tailgaters/vendors none seem to have suitable cases. (Did snag an almost new Experimental Methods in RF Design book for $10, so not a total waste of time.)

My buddy and I decided to head over to Skycraft Parts & Surplus in the afternoon. While he made the rounds for parts for his next project, I headed for the surplus cases.  There on the top shelf were 5 aluminum cases. Pulled one down and said WOW, it is perfect for the BitX. They were made for transportation IP based video systems. The size is 8.2 X 8 X 3.5 inches and has separate panels for top, bottom, front and rear. As you can see from the pictures attached, the LCD hole is already cut as well as holes for a fan, BNC, and switch. Even included a circuit board with LCD, fan, BNC, etc.  Price $9.95.

If you are in the central Florida area (they will mail order) and are in need of an outstanding aluminum case for your uBitx or Bitx40/20 may want to check it out. Suspect they won't be on the shelf too long.

Re: TDA2822 ill treatment test! Photo of blown TDA

Michael Aiello
 

Mine failed immediately after apply power to the board after wiring up the power connector. Nothing else was connected. There was a loud crack, and a puff of magic smoke, then silence.
Photos  of failed chip look similar.
I think the chip may have been already replaced once on the board before I got it - see the soldering of the chip pins vs. the soldering ot the other surrounding connections. Looks like it was manually soldered to me. These photos were taken before I replaced the bad chip with a socket, but after the failure happen.
Probably one or more bad chips involved, the replacement in the socket has been completely well behaved.

73
Mike N2HTT

Re: Bitx40 with Raduino stopped working #bitx40help #bitx40

Allard PE1NWL
 

When you connect the Raduino to your PC, it will get +5V power supply via the USB cable.
I checked the voltage and it still has 12.58 volts at the Radunio
This voltage goes to the input of the 7805 voltage regulator. What voltage do you see on the regulator output? (should be +5V).

73 Allard PE1NWL

Re: Bitx40 with Raduino stopped working #bitx40help #bitx40

Jamie Dean
 

Yes it lights up but no text. Also the power and light under the display comes on. But not when attached to the bitx.

Jamie - KW4XR

Re: BITX QSO Afternoon/Night, Sunday, March 4, 3PM/7PM Local Time, 7277 kHz in North America, 7177 kHz elsewhere

_Dave_ AD0B
 

Thanks John
I will be there
KE0PVO
Dave

Re: Bitx40 with Raduino stopped working #bitx40help #bitx40

Michael Hagen
 

Does LCD work when on USB power?

Mike


On 3/2/2018 6:20 AM, Allard PE1NWL wrote:
Make sure the the 16-pin connector to the display is positioned correctly
(you can easily shift it one position by mistake)

73 Allard PE1NWL

On Fri, March 2, 2018 14:55, Mvs Sarma wrote:
try replacing dispay

On 2 Mar 2018 19:22, "Jamie Dean - KW4XR" <jdean72985@...> wrote:

I'm hoping someone has a idea on what to do to fix this.

My YL and I built the Bitx40 with the Raduino three nights ago. It was
working fine till today I
unplugged the Radunio to mount it in a case. When I hooked it back up
the
display will not light up and only a few clicks in the speaker. The unit
will still key with no output power. I checked the voltage and it still
has
12.58 volts at the Radunio. I also hooked the Radunio to the PC to check
if
it was dead. It was able to be recognized and the ardunio software was
able
to talk to it.

Any ideas what might have happened? All connections look ok.

Thanks in advance,
Jamie Dean - KW4XR
Morganton, NC USA



      





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

Re: uBit Software

 

A easier way,

Go to https://github.com/phdlee/ubitx/tree/version1.03
Click the green clone or download button, then choose Download Zip.
Once downloaded just unzip the file and the folder is inside and ready to open in the Arduino IDE, just double click the file inside the ubitx_20 folder named ubitx-20.ino and the IDE will start and open.

Joel
N6ALT

Re: TDA2822 ill treatment test! Photo of blown TDA

Michael Hagen
 

Needs some Crazy Glue!!


On 3/2/2018 6:16 AM, DrZ wrote:
Here is what mine looks like - it's the one that came in the Bitx - Howard

-- 
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

Arvo W0VRA
 



The one in mine, s/n 263/2.

Here's the datasheet for this variant:  http://pdf1.alldatasheet.com/datasheet-pdf/view/210172/FCI/TDA2822M.html

It has a max supply voltage of 16V.

Has anyone seen one of these FCI amps explode?