It can be replaced with a NET725 but I would rather upgrade the opamp not just replace it. The opamp goes in a driver board for a Harman Kardon citation 16. Any help is appreciated. Thanks. G

Anyone seen this? http://www.pmillett.addr.com/hybrid_head.htm G

Hi guys, I've been working on this circuit for a couple of days now and I think it's ready for comments (good or bad). This all started when I ran across this schematic: http://members.tripod.com/~gabevee/sstubepre.html I thought that the circuit would make a good headphone amp with a few...

I've sent an order to Michael by email 4 times in the last week and have gotten no reply. Does anyone know if he's out of town or is he running that far behind? Thanks.

Which would you use in a circuit to drive low impedance headphones?

Hi guys, I have attempted over the last couple of days to lay out a solid state(gasp!)headphone amp using ExpressPCB. It is a OPA627 with a BUF634 inside the loop(Jung multiloop style). I just wanted to get some learned opinions of the layout before I start to work on the regulated supply. I...

Hello All, I've finally finished (theoretically) the tube headphone amp design that I have been working on too long. This is a pretty involved design as far as the filament supplies and the PSU go. The amp is pretty straight forward though. This is not a cheap design even if you don't use...

I would like to use the JFET Preamp circuit found at the link below as a gain stage (actually stages) and use the Szekeres Mosfet driver as the output stage. My question is can I delete the input cap on the Szekeres driver since the preamp has a output cap? Also the preamp circuit has the volume...