hi,
a friend of mine built a LM3886 amp.
wiring the pot the wrong way round he started the amp with full volume.
his speakers just went completely dead and stunk like hell.
he just wanted to try it and took an underrated trannie (120VA,48V ctp.) for both channels.
with all the protection of the IC´s that shouldn´t have been the problem!?
he came along and i tried to find the mistake.
before he took the inputs off the board.
we measured -1.5V DC at the input and 30V! at the output.
after getting the pot back in everything was back to normal.
the chips were placed in a professionally designed PCB.
has anybody encountered problems like this?
is that DC-offset (without the input connected) normal?
pots can always lose contact, go defect... and then you get dead speakers??
was it the trannie?
thanks in anticipation
a friend of mine built a LM3886 amp.
wiring the pot the wrong way round he started the amp with full volume.
his speakers just went completely dead and stunk like hell.
he just wanted to try it and took an underrated trannie (120VA,48V ctp.) for both channels.
with all the protection of the IC´s that shouldn´t have been the problem!?
he came along and i tried to find the mistake.
before he took the inputs off the board.
we measured -1.5V DC at the input and 30V! at the output.
after getting the pot back in everything was back to normal.
the chips were placed in a professionally designed PCB.
has anybody encountered problems like this?
is that DC-offset (without the input connected) normal?
pots can always lose contact, go defect... and then you get dead speakers??
was it the trannie?
thanks in anticipation