hi and thanks for your help! i've applied the modifications you suggested me, but i noticed i wasn't able to simulate the circuit due to a "singular matrix" error. however, here's some thoughts:
- i forgot to say i will use the LM324, also because it come in a convenient package of 4 op-amps
- i've increased the value of R$, but do i really need to remove C1? i would like to smooth the incoming signal non to get a series of pulses on the output
- despite reading this point many times, i haven't understood
- D1 removed
- thanks for the advice, i've put a resistor between the output and the diode to limitate the current
following your advices and messing a bit with the circuit, i end up with this:
as you can see, i put R4 to limitate the input current, i reduced the gain to about 6, i added the current limiting resistor to the output as well as a filtering capacitator. on the simulation everything looks fine, what you you think?