Hello,
As part of an open-source DJ controller/4ch audio interface I designed an I2S DAC using the PCM1792A DAC and OPA1632D op-amp. Schematics and board images are available here: https://imgur.com/a/m6g4z
It works perfectly (minus the heat issue) and sounds great (haven't measured yet but no noticeable difference from my MOTU UltraliteMk3). The OPA1632Ds get pretty hot - hot enough to be unpleasant to touch after a few seconds.
The PSU feeding the board measures 350mA at 12v so no huge current draw (there are 2 DACs and a 5 LEDs on this board).
A random guess would be some oscillation but wouldn't that result in some hearable noise? I also looked at the output of one of the channels with a 50MHz scope and didn't notice anything suspicious when outputting a sine wave using some tone generator.
Thanks!
As part of an open-source DJ controller/4ch audio interface I designed an I2S DAC using the PCM1792A DAC and OPA1632D op-amp. Schematics and board images are available here: https://imgur.com/a/m6g4z
It works perfectly (minus the heat issue) and sounds great (haven't measured yet but no noticeable difference from my MOTU UltraliteMk3). The OPA1632Ds get pretty hot - hot enough to be unpleasant to touch after a few seconds.
The PSU feeding the board measures 350mA at 12v so no huge current draw (there are 2 DACs and a 5 LEDs on this board).
A random guess would be some oscillation but wouldn't that result in some hearable noise? I also looked at the output of one of the channels with a 50MHz scope and didn't notice anything suspicious when outputting a sine wave using some tone generator.
Thanks!