03-09-2021, 03:04 PM
Look forward to the results Amie, wacky ideas which work , result in huge amounts of lab cred 
Tracy, I probably should've started a new thread for AVC rather than hijack Trevor's thread, but were already talking about it before my post. Your suggestion of an op amp is well worth looking at, why don't you get a traditional superhet and put an op-amp in that to drive the AVC line and see!
My circuit has the high-gain DC amplifier. At the moment the gain is limited by the 33 megohm feedback resistor (I could've looked at system stability to avoid AVC motorboating but chickened out and limited the gain!) but that's just the first cut. In principle I'm aiming to take that out and let the gain in there go skyhigh, as high as the 1j24b can provide, which will approximate your op-amp anyway. That should keep the output level absolutely constant until the AVC system runs out of range.
Tracy, I probably should've started a new thread for AVC rather than hijack Trevor's thread, but were already talking about it before my post. Your suggestion of an op amp is well worth looking at, why don't you get a traditional superhet and put an op-amp in that to drive the AVC line and see!
My circuit has the high-gain DC amplifier. At the moment the gain is limited by the 33 megohm feedback resistor (I could've looked at system stability to avoid AVC motorboating but chickened out and limited the gain!) but that's just the first cut. In principle I'm aiming to take that out and let the gain in there go skyhigh, as high as the 1j24b can provide, which will approximate your op-amp anyway. That should keep the output level absolutely constant until the AVC system runs out of range.
