Hello Wood   I'm also listening to the PCM2704 card with a hefty (self-built) amp and good speakers (sorry if that's not quite in the spirit of these forums!) and it sounds rather tremendous - I can't imagine how it could sound any better! I'm going to build one of these cards into the amp...

Have now fitted the 22n/16R on each output as suggested by the data sheet, and the instability is cured. The circuit happily drives my headphones now to a reasonable volume. Of course, an external amplifier and analogue volume control is preferable to controlling the volume in software, in order...

Hi Wood   I beg to differ that you should need to add series resistance with headphones. The data sheet shows phones coupled directly via the output caps, but also shows the 'Zobel network' (if that's what it is) in parallel when driving phones or an amplifier. It also shows a 3k3 to ground...

I bought one of these for about $18 including postage, but I think there is a vital circuit element missing from the PCB! The PCM2704 data sheet shows a couple of components directly coupled to each output pin (a 16R in series with a 22n cap to ground) prior to the output caps, but these are...

The more I try out various headphones the more I'm convinced that very few of them have a neutral sound. Tweaking EQ settings can help, but to my ears, the characteristics of most headphones vary with the level of the sound. Many of them seem to 'compress' transients, and possibly the frequency...

I'm fascinated by the idea of building heaphones from scratch for the simple reason that I just can't find headphones that sound any good to me regardless of price, and I'd like to be able to tweak to my heart's content. I've listened to headphones that get rave reviews and I can't help but...