I want to power up the soundcard w/o the PC.
What would be the point of that? You aren't going to interface anything easily with PCIe anyway.
Well I'm not sure it's fried or it. So far I mapped out a lot of the schematic. Seems good, checked a lot of caps w/ LCR meter, nothing stand's out.
I found this
R3112Q282C
Ricoh
SC-88A
Voltage detector IC
2.8V±2%, -Reset ODO
Took me a while to figure out what it was in circuit, on the output of the 1V step-down converter. Now it makes sense.
I can't find a datasheet tho, anyone know the name of something in LTspice like those ?
As for the distortion I remember, if it was an transistor radio, I'd say the distortion was not at the input stage. But was getting digitized somewhere, making distorted/computery sounds from the speaker, as opposed to a sound like static on the output, or mains hum
As for the digital of what this thing does, it's 99% new to me. What all can I do powering this thing off PSU, and using an AWG ? I know the CPU won't want to do much like that, but I mean for checking the op-amps, and looking around for fun.
I just brought up the PC to test it in, my BusPirate is under CV lockdown at the post-office, what else can I try. What programs can talk to a soundcard on PC and tell me exactly what's up? I have diff.probes if I want to go probing the card in the PC.
I will learn all this stuff over the next few years (unless some major changes)