Date   
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: 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!

 

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: TDA2822 ill treatment test!

 

No, the chip on short did not draw a large current.

Raj

At 01-03-2018, you wrote:
I suspect the 2A limit on his power supply saved the chip!

Ron W7HD


On 03/01/2018 10:00 AM, Joe Puma wrote:
Thanks for taking one for the team Raj. ðŸ‘ðŸ¼ðŸ‘ðŸ¼ðŸ‘ðŸ¼
On Mar 1, 2018, at 7:04 AM, Raj vu2zap <@Raj> 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.



--
W7HD - NAQCC#7587 OMISS#9898 KX3#6966 LinuxUser#415320


Re: full rig power control unit

K9HZ <bill@...>
 

R19 = 100K, C10 = C11 = 0.01uf… 50V general RF bypass caps…

 

 

Dr. William J. Schmidt - K9HZ J68HZ 8P6HK ZF2HZ PJ4/K9HZ VP5/K9HZ PJ2/K9HZ

 

Owner - Operator

Big Signal Ranch – K9ZC

Staunton, Illinois

 

Owner – Operator

Villa Grand Piton – J68HZ

Soufriere, St. Lucia W.I.

Rent it: www.VillaGrandPiton.com

Like us on Facebook! facebook icon

 

Moderator – North American QRO Yahoo Group.

 

email:  bill@...

 

 

From: BITX20@groups.io [mailto:BITX20@groups.io] On Behalf Of wb7dmx@...
Sent: Thursday, March 1, 2018 8:00 PM
To: BITX20@groups.io
Subject: Re: [BITX20] full rig power control unit

 

what is the value  of R19.   q00k means nothing to me.
also what is the value of C10  and C11.
they  are not in the bill of materials.


Virus-free. www.avg.com

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

Clark Martin
 

ICs are only capable of implementing rather small capacitors, well below what is needed for a DC isolation cap in an audio power amplifier.

Clark Martin
KK6ISP

On Mar 1, 2018, at 2:56 PM, Arvo KD9HLC via Groups.Io <arvopl@...> wrote:

On Thu, Mar 1, 2018 at 02:38 pm, Gordon Gibby wrote:
The opamp output transistor circuit can only move between zero and a positive voltage.  
Yes, but I'd think if someone was building an IC audio amp they'd go ahead and stick a cap inside it!

I suppose different applications would have different optimum caps.
_._

Re: full rig power control unit

Glenn
 

Agreed, but any fault turns OFF Q1 and thus D4 the 'fault' LED.   My reading of the schematic says that the text 'Operate" and "Fault" is transposed on the LEDs's.

glenn


On Thu, Mar 1, 2018 at 05:28 pm, K9HZ wrote:

To be clear, the SCRs trigger the RS flip-flop into the RESET (FAULT) state and it stays in reset until the fault condition presented by the SCR has been cleared.  THEN and only then can you SET the flip-flop (NORMAL) such that power is reapplied through U2.

 

 

Dr. William J. Schmidt - K9HZ J68HZ 8P6HK ZF2HZ PJ4/K9HZ VP5/K9HZ PJ2/K9HZ

 

Owner - Operator

Big Signal Ranch – K9ZC

Staunton, Illinois

 

Owner – Operator

Villa Grand Piton – J68HZ

Soufriere, St. Lucia W.I.

Rent it: www.VillaGrandPiton.com

Like us on Facebook!

 

Moderator – North American QRO Yahoo Group.

 

email:  bill@...

 

 

From: BITX20@groups.io [mailto:BITX20@groups.io] On Behalf Of Glenn
Sent: Thursday, March 1, 2018 6:42 PM
To: BITX20@groups.io
Subject: Re: [BITX20] full rig power control unit

 

I only see one 62R resistor. I assume you mean that one is 68R ?   C10 & C11 are not in the bill of material.

Did you see my other post re the apparent reversal of the 'operate and fault' led's?

The reset switch does not reset the SCR's. Only the astable.

glenn
vk3pe

 

Virus-free. www.avg.com

Re: For Sale - Raduino (from uBITX kit)

n5ib_2
 

The Raduino and display are spoken for...
Jim, N5IB

Re: uBit Software

Jack, W8TEE
 

Actually, you must name the directory holding the source files with the name of the primary INO file. It's an Arduino thing! Actually, by making all of the files an INO-type files is how the compiler can make sense of things, as it effectively combines all of the files together into one huge file for compiling. However, when a bug occurs, it's like trying to untangle an open-faced spinning reel after a bad cast. Fortunately, Lee knows what he's doing and can cope with those issues quite easily.

Jack, W8TEE



From: Michael Hagen <motdog@...>
To: BITX20@groups.io
Sent: Thursday, March 1, 2018 9:15 PM
Subject: Re: [BITX20]uBit Software

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@...


Re: Where to from here?

Dingle
 

Please take a look at this thread for installing the firmware - https://groups.io/g/BITX20/topic/ubit_software/13284635  He has a compiled hex file you can use to make it a little easier.

Re: uBit Software

Michael Hagen
 

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@...

Re: uBit Software

Dingle
 

Hi.  Here's the link on how to install the firmware - http://www.hamskey.com/2018/01/how-to-upgrade-ubitx-firmware.html  He also has the link for the hex file so you don't have to compile anything.  I installed it and it's great!

Re: Where to from here?

Jack, W8TEE
 

Load the Arduino IDE, press File --> Open and navigate to the ubitx_20 directory and click on the ubitx_20.ino file in that directory. The IDE should open that file as the first file, and there should be all of the other files in "tabbed windows" in the IDE's Source Code window. Connect a mini B USB connector to your computer and to the Nano, go to the Tools --> Board and select Nano, then do Tools --> Port to select the USB port you connected to the Nano. Press the compile/upload arrow (just below the Edit menu) and wait for it to complete your upload and enjoy.

Jack, W8TEE



From: Michael Hagen <motdog@...>
To: BITX20@groups.io
Sent: Thursday, March 1, 2018 9:01 PM
Subject: Re: [BITX20] Where to from here?

How do I load his software into Nano.  I just asked how to do that.
I may have found the wrong site, but could not figure out what to load into Arduino Ide?
TNX
Mike

On 3/1/2018 4:34 PM, Dave Bottom wrote:
See Ian, KD8CECs blog and link to his firmware - turns it into a great radio 

Dave WI6R


On Mar 1, 2018, at 4:30 PM, davidaker@... wrote:

This afternoon, I drilled out my enclosure (one of the mailboxes from Lowes) and wired it up and made a contact on 30m and 40m (putting out 11 watts on 160, 8w on 80, 6w on 40m and about 3w on 20m).  How do I control output power and is there a way to jump to another band other than cranking the vfo?  Haven't wired up the mic yet.
<IMG_20180301_165829.jpg>
<IMG_20180301_165927.jpg>

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


Re: U1 fried

_Dave_ AD0B
 

I wired my jack to plug in a monaural speaker as the case I used was small. Soldered the leads to the middle and tip. That way when I wanted to plug in stereo headphones both sides will work.

Re: uBit Software

Dave Bottom <ars.kd6az@...>
 

Ian has compiled binaries ready to install.  I’m on the road but he has complete instructions on how to do this on his blog.  See the link to his blog on his QRZ page.  

While it is sometimes hard to find the direct link on github, for the latest I’ll look it up in the morning and post it once again. 

I think the latest (for stock hardware) is v1.02 or v1.03 and you generally have to read all the way to the end of his description of updates to find the link.  It’s very straight forward to install following the instructions on his blog.

I don’t believe there are yet complete instructions, playing with his menus you discover most of it easily.  It’s been 25 years since I’ve done any software and I’m almost 70 (June) so don’t think it’s too tough.  

I’m looking forward to learning again when I finally retire and have time.  I also bought Jack’s book on programming the Arduino. Jack, W8TEE if you don’t recognize from his many posts here.

Dave WI6R

On Mar 1, 2018, at 5:53 PM, Michael Hagen <motdog@...> wrote:

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

 

Re: Ubitx rf our #ubitx

DrZ <zehrhj2@...>
 

One solution might be to use the Sotabeam Milliwatter attenuator. It has two settings and a built in T/R bypass.  I'm not sure they make them any more, however.  I do have one I don't need, in case anyone is interested.
Howard K4LXY

Re: uBit Software

Jack, W8TEE
 

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
 


Re: Where to from here?

Michael Hagen
 

How do I load his software into Nano.  I just asked how to do that.

I may have found the wrong site, but could not figure out what to load into Arduino Ide?

TNX

Mike


On 3/1/2018 4:34 PM, Dave Bottom wrote:
See Ian, KD8CECs blog and link to his firmware - turns it into a great radio 

Dave WI6R


On Mar 1, 2018, at 4:30 PM, davidaker@... wrote:

This afternoon, I drilled out my enclosure (one of the mailboxes from Lowes) and wired it up and made a contact on 30m and 40m (putting out 11 watts on 160, 8w on 80, 6w on 40m and about 3w on 20m).  How do I control output power and is there a way to jump to another band other than cranking the vfo?  Haven't wired up the mic yet.
<IMG_20180301_165829.jpg>
<IMG_20180301_165927.jpg>

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

Re: full rig power control unit

wb7dmx@att.net
 

what is the value  of R19.   q00k means nothing to me.
also what is the value of C10  and C11.
they  are not in the bill of materials.

Re: uBit Software

Michael Hagen
 

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