Well, you asked about the 4W-amp right, then it´s probably in the thread about the 4W-amp ;-)
The link is in post #8 in case you forgot.
If you, for whatever reason, are looking for a Class-A buffer that you can drive with your headphone amp (assuming that has some voltage gain), you could have a look at this FET-buffer which gets some love around here:
SEWA - Seven Watt Amplifier
But that one has considerable power dissipation for little output; just saying.
I have an RME Babyface Pro, which the engineers have assured me can swing 8.4V into as little as 600 ohms (line level, one side of the balanced output - both sides too).
That design looks like it does exactly what I'm looking for. 7v rms (10v p-p). Is it just the one 40V rail? I'm not concerned about efficiency. My last amp (if I can't get it fixed) was a 140 (more like 250) watt into 8 ohms (1000 into one, single channel only - 32A) which pulled 370 watts/500something VA in normal use.
I came across another design, simpler with no voltage gain, called the "mofo" lol. Have you heard of it? Apparently people were impressed
https://www.diyaudio.com/forums/pass-labs/313649-build-mofo-279.html#post6368030
That design looks like it does exactly what I'm looking for. 7v rms (10v p-p). Is it just the one 40V rail? I'm not concerned about efficiency. My last amp (if I can't get it fixed) was a 140 (more like 250) watt into 8 ohms (1000 into one, single channel only - 32A) which pulled 370 watts/500something VA in normal use.
I came across another design, simpler with no voltage gain, called the "mofo" lol. Have you heard of it? Apparently people were impressed
https://www.diyaudio.com/forums/pass-labs/313649-build-mofo-279.html#post6368030
yes, we all have heard of MoFo
apparently not you if you are acting surprised
there is LuFo too...
apparently not you if you are acting surprised
there is LuFo too...