Tubemooley
Well-known member
I have been following this thread with great interest. This is a really killer project. I will be interested in any group buy for raw etch. Converter performance is influenced by the power supplies. Big shock there. Usually there is +5 VDD to power the digital side of the converter and any other digital IC's. Then there is +5 VCC for the analog side of the converter. Then, if you are running analog opamp circuits just outside the converters, well, they require their own supplies too (duh). Probably +/-15 VDC for those circuits. Now, ideally, those will all be completely independent separate supplies. But in practice, that can be difficult. And then, as we all know, linear supplies are generally more desireable than switchers. But I have found that switchers are more than suitable for use with converters. The noise generated inside those IC's can be far greater than any switcher noise. Careful IC de-coupling is highly recommended. So.... to try to answer the original question..... Multiple options exist especially if we're doing DIY. Check your shelves and pull out whatever will work. If you have nothing on your shelves, go to Mouser or Digi-Key or eBay. Now I have to back-track briefly. I believe Raphael is using the PCM4204 IC here. The VDD for that IC needs to be 3.3v. So there, I just complicated matters. But that's the way it is with a complex design like this. Really nice work Raphael. DANA.