Its a long time since I used an LM3914 but I think it's possible to lift the bottom of the divider chain above ground to set the minimum reading. The...
That is the correct type of coil but the inductance depends upon how you use it. In its simplest form, you use the inductance and a small capacitance...
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...
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