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?
However this is not the case! The limiter maintains 16V peak to peak output even when the input amplitude is changed!
Infact, I can visually see the output signal correcting itself as changes are applied! (I will try to capture on video)
I believe the problem lies with the final OP AMP gain setting?
Measurements of the low pass section shows "Unity Gain" which is to be expected!
I cannot explain why?? Maybe the TL074CN has better gain over older types?? Maybe the TOKO filter was not Unity Gain?? Maybe the replacement JFET has an effect?? Who knows??
If we look back at the schematic, R11 sets the Gain for the final stage! I have found that reducing the value of this resistor gives much better results!
![Smile :)](./images/smilies/icon_e_smile.gif)