New to this forum(been reading it a little though), but not new to audio and DIY.
I've had a BCL clone for a few years now. Don't now the name, the PCB says "JSDZ" and Ver: 100908
I've tried, so far, NE5532, LM4562, OPA627.
Finished a "discrete opamp" yesterday, did a bit of measuring today.
4pcs 2SK170GR 3,4mA, 3,6mA, 3,4mA, 3,6mA
2pcs 5R1 1206 SMD
2pcs Bourns 10R multiturn variable resistor
Fitted this on a DIP8-socket.
When measuring with a pair of cheap in-ears as load and the inputs of the BCL clone hooked to an old cell phone, I got 0.0mVdc to +-0.8mVdc. Max time it's been powered on so far is about 20 minutes.
That is as close to 0Vdc as I've gotten. I think my DMM might be off abit (or interfering) as when I leave the outputs alone for a while I get very close to 0Vdc(0VC +-0.1mVdc).
I haven't removed the input caps yet, but could do it with zero issues as the USB-DAC I use as source has edcor signal transformers on the output instead of opamps, ie 0.000mVdc out from the DAC.
When turning off the BCL clone, there's no pop or anything with the discrete "thingy", the music just fades away.
What would be acceptable numbers in terms on mVdc on the outputs? I have not connected my Goldring DR150's to it yet as I want to know that it is safe first.
Edited by mayday75 - 6/6/15 at 2:19am