Re: The issues of the TDA2822
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Just to put thr record straight, once we figured out which batch was the problem, we did not proceed with it. We junked 500 of the remaining chips, tried many other sources and found good ones.? That said, it did take us time to realize there was a problem. Unless somethinf emerges as a pattern, it becomes difficult to spot a production failure. We cannot halt production for jndividually reported problems. To be on the safe side, we now subject every board to 14v to smoke out any potential problems.
On 13 Mar 2018 7:07 am, "KB1JPW" < a.fairaizl@...> wrote: Al,
I ordered mine on Jan 5th and powered it for the first time last night with one of the WX versions on-board.? I had about 5 mins of audio on 80 meters and then it went silent.? I've been able to power it on and everything else seems to work fine, just no audio. I get a little pop when turning on but that's it now.? I checked and there were no issues with any of the caps/resistors/radiuno, etc.? I'd say you're safe to go ahead and give it a shot.? I read and re-read all the instructions, looked at every picture I could find along with every post out there. I still had one blow.? I'm just counting this as part of the build experience where I get to learn to troubleshoot the circuits early in the game.??
Just make sure you've got everything plugged in all the way before powering on. Double check your wiring on the audio pot to make sure it's not flipped. With the headphones - do not plug in when powered on or pull out to be safe.?
I've tracked down a replacement ic for the TDA2822 already and have a 386 I'm going to breadboard in the meantime.?
Drew?
KB1JPW?
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