Sinus!!! The problem is that if you reduce the gain of the output op-amp, you'll never reach the limiting level, because the rectifiers won't see enough signal.....sinus trouble wrote: ↑Sun Feb 19, 2023 11:47 pm Above, We can see the two 1Khz signals!
RED is the input signal @ 1V peak to peak
Green is the output signal @ 16V peak to peak
This explains why the limiter is too loud to feed any sort of exciter! So at first glance, it would seem that the limiter is not functioning?
You're going to have to change the gain of the first rectifier op-amp too. The output amp has a gain of 56 - determined by the value of the feedback resistor divided by the inverting input to ground resistor - in your case 56k / 1k = 56 times.
Suggested experimental "fix":
If you change the 56k feedback resistor (R11) to 28k (just solder another 56k in parallel) and reduce the 47k (R16) to half its value by soldering another 47k in parallel, you should have pretty much the same input level for onset of limiting, but your output level will be halved. You will have halved the output stage gain, and doubled the gain on the input to the first sidechain op-amp (IC1.2)
Give that a try, and see if you now get a squeezed output at half the level....
Incidentally the gain of an op-amp stage doesn't change with type of op-amp - it's entirely determined by the resistors around it!!
You really do need to read Horowitz & Hill!!!