The WX branded TDA2822 simply does not meet spec.??
We have no idea what spec it meets, as WX does not have a datasheet for it.
In addition to an apparent absolute max supply voltage of around 6 or 8v,
it quite likely suffers in the audio quality department.

The NJM2073D (not NJM2037D) is a compliant TDA2822, built by a respected manufacturer.
Easily available, in stock at Mouser (513-NJM2073D) and Digikey (NJM2073D-ND),
both distributors have thousands in stock.
Good choice.

Those wishing greater speaker volume on a v4 board could do well to dead bug a NJM2073D
to the back of the uBitx board, replacing everything between the volume control and the speaker
as per the v3 schematic.? Or do the same with an ebay LM386 audio amp module
(a fully assembled board) as per the Bitx40 schematic, cost of about $1.? Plus shipping.

Jerry



On Thu, Jun 21, 2018 at 09:47 am, allen west wrote:

I received my uBitx in February but did not put it together until early May. ?As soon as I plugged in a mono headphone I blew out the TDA2822. ?It did have the WX on it. ?I removed the chip and installed a socket and replaced it with a pin compatible NJM2037D. ?It has worked fine since and even sounds better than the 2822. ?I am very satisfied with this NJM2037D amplifier chip.

?