Two points:
R4 value looks too low, it is only there to ensure the gate has some leakage current when the output of the MOC3020 is high impedance, I...
Yes, but with the risk of damaging the meter and possibly the IC at higher signal levels. It isn't a safe strategy.
A better approach if you want to...
Not PWM, what you need is an op-amp as a gain stage, a rectifier (either diode or better still an op-amp based precision rectifier) to give you a DC...
As per FvM, don't confuse FM and AM bandwidth requirements. The deviation of standard FM broadcasts is far wider than the bandwidth of normal 455KHz...
I do not doubt any of the technical explanations about diode recovery time and how to snub the spike but I do have reservations about how relevant it...
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