my lil p2p lm3886

[TjongKristian]

hi Wazzy, I am also doing the same thing as you. I measured a -90's mv dc offset at both sides of the amp, although it went down to -10's mv when I connect the amp with my DCB1 and cd player. How much offset did you get with yours?

 

[wazzy]

hi Wazzy, I am also doing the same thing as you. I measured a -90's mv dc offset at both sides of the amp, although it went down to -10's mv when I connect the amp with my DCB1 and cd player. How much offset did you get with yours?

greatings, i also got a bit of a fright with mine when i first measured, remember though in this topology we are dc coupled, i just measured and am getting about 25mv of offset, one of the lm's i used was sitting at 74mv so i changed it, was a different batch number to the ones i'm using now, i guess that with a bare bones amp like this everything affects everything. have you tried a listening test? best regards.

 

[openback]

this is apparently the circuit from the original gaincard amp by 47labs. i would include Ci from the data sheet, you will also see this circuit uses a zobel on the output.

Got it. Thanks wazzy!

 

[wazzy]

pleasure!