peter purpose
Well-known member
Gents,
I picked up an old bit of gear for the transformers nailed to it. It has discrete circuitry and a tertiary feedback winding on the output transformer.
I fired it up and it works nicely, but would like to see if I can get more gain out of it before I just rob the transformers.
I tried replacing the feedback network with an ordinary op-amp type network, but the negative rail would not come up to spec (as standard, the neg rail takes 30 seconds or so to come up, but this stayed at -5 or so volts) .
Nothing got warm or damaged and standard circuitry was put back in.
The tertiary winding is roughly 22dB down from the secondary output.
RGV gives me +&- 5dB, but I'd like to shoot for more.
So gentlemen... Can it be done?
Cheers
peter
I picked up an old bit of gear for the transformers nailed to it. It has discrete circuitry and a tertiary feedback winding on the output transformer.
I fired it up and it works nicely, but would like to see if I can get more gain out of it before I just rob the transformers.
I tried replacing the feedback network with an ordinary op-amp type network, but the negative rail would not come up to spec (as standard, the neg rail takes 30 seconds or so to come up, but this stayed at -5 or so volts) .
Nothing got warm or damaged and standard circuitry was put back in.
The tertiary winding is roughly 22dB down from the secondary output.
RGV gives me +&- 5dB, but I'd like to shoot for more.
So gentlemen... Can it be done?
Cheers
peter