Adam via groups.io <qrp-labs@...> wrote:
I hope it didn't kill anything more :) But I ordered three FST3253 (and
four LM4562) to have spares, so if it still doesn't work, I'll see if IC4
is fine and will replace it too.
An update, if someone's interested.
Amplifiers arrived (switches still didn't -- I ordered them from a
different seller, maybe they'll arrive on Monday).
I replaced the amplifiers and now there's a good bias voltage on them
(around 2,5 volts), audio filter sweep looks very nice too.
RF filter sweep shows that the BPF is out of tune, but I'll check it again
when I install the switch IC (I think it can affect that).
So the op amps definitely were damaged.
