Originally Posted by WK3K
Just saw this in the PupDac build notes:
"One thing to be aware of - the latest chips from TI use a different case material and is actually hygroscopic. The pins are sealed at the case body, but the body itself may absorb moisture. This is nothing to worry about except when you've rinsed at the end and you're ready to plug it in - don't. Wait for a few hours, use a hair dryer, put the PCB out in the sun, etc. to make certain that things are dry under and inside the chips. Otherwise, you'll drive yourself crazy trying to figure out why your DAC doesn't work or seems to de-activate itself every few minutes."
Will that apply to GrubDac components as well?
It's possible. There's certainly something going on with the DAC chip if it stops playing when pressed. Unlike most scenarios, where pressing might put a dodgy connection into good contact, perhaps there's a bridge underneath the chip and/or pins that comes into contact when pressed. The fact that the analog volume goes up and down, stops on its own, etc. is also an indication.
The DAC chip on the GrubDAC is fairly close to an SOIC opamp in terms of difficulty. Perhaps it can be removed, the PCB cleaned up, then soldered again. The Wolfson DAC on the GrubDAC is pretty cheap, too - so a full replacement is not a lot of trouble, either.