I am about to test a circuit including this integrator and decided to add a LED turning on when Vin is within window.
The actual Vwin (comparator's output) is quite close to what LTSpice predicts.
Remaining space in the crowded board, allows just a TO92 and few resistors. All what I tried with BJTs created problems to the integrator or did not work.
Could anyone come with an effective design? I spent one full journey trying in LTSpice because I do not dare to rsik the only two pairs of JFETs I got (2 x 2N5461 Pchannel + 2 x J310 N channel).
Please note: I need to add a LED and NOT to modify the integrator.
Just in case I am adding the .asc file plus model and subckt