@schultzsch
I finally connected the modules for testing and with both connected my PSU sink to +/-22.6V, so I re-biased to 1.4A. Measured across the two 0R22 (0R11) resistors for 154mA which gives 1.4A. Test heatsink becomes hot fast but that is expected.
One module has 8mV offset but the other one is at 23mV and it is a little high for me, not terrible but I prefer below 10mV offset. I see the offset trimmer is not installed, should I install one?
Thanks
Do
I finally connected the modules for testing and with both connected my PSU sink to +/-22.6V, so I re-biased to 1.4A. Measured across the two 0R22 (0R11) resistors for 154mA which gives 1.4A. Test heatsink becomes hot fast but that is expected.
One module has 8mV offset but the other one is at 23mV and it is a little high for me, not terrible but I prefer below 10mV offset. I see the offset trimmer is not installed, should I install one?
Thanks
Do
Hello Do,
I left out the trimmers for the offset adjustment because when you adjust the offset you alter also the thd profile.
I did the best possible to have under 40mV.
I consider 40-100mV offset ok.
If you insist having the offset under 10mV you could install the trimmers.
This part should be used for this task.
How do you like the sound?
I left out the trimmers for the offset adjustment because when you adjust the offset you alter also the thd profile.
I did the best possible to have under 40mV.
I consider 40-100mV offset ok.
If you insist having the offset under 10mV you could install the trimmers.
This part should be used for this task.
How do you like the sound?
Ok, i understand the reasoning behind it, I’ll keep it as is, 23mV ain’t the end of the world.
Thanks
Do
Thanks
Do
As for the sound, I’ll let you know shortly, right now it is connected to test speakers/equipment so I cannot say for sure, although it seems to sound very good.
@schultzsch
This amplifier is very good! I’m impressed!
Superb soundstage, solid bass and voices are superbly randered. You’ve got a winner !
Thanks
Do
This amplifier is very good! I’m impressed!
Superb soundstage, solid bass and voices are superbly randered. You’ve got a winner !
Thanks
Do
Mine is up and running now, +-25,2VDC @1A in a 3u 300 case, little sweet and capable thing! Have a bump on me
I built one for a friend and it is implemented exactly like that. He loves it a lot.
Recently he sent a photo with the amp together with his Christmas tree.
If everyone is happy then I am happy too.
Recently he sent a photo with the amp together with his Christmas tree.
If everyone is happy then I am happy too.
There is nothing to modify for bal in.
The amp has balanced input.
If you want to use se input you will have to connect -in of amp to gnd.
The amp has balanced input.
If you want to use se input you will have to connect -in of amp to gnd.
Hmm, I don't quite get it. The schematic in the first post is a bit too blurry for me to read stuff. Can you provide the schematic so I can read the labels around the input circuit?