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Peak Detector Circuit

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DavidAlfa:
Not what I'd call simple using discrete parts.
If the wave is just 30Hz or so, use an ADC, 1KHz sample rate will be far enough and the software is nothing fancy.

But could be achieved using few inexpensive parts: 1x Quad Op-amp, 1x 74HC14, 1x 4016 cmos switch and some passives.
The clocks can be used to tell the MCU when start a conversion.

MathWizard:
Yeah you need something to reset your peak when the slope of the voltage changes negative again, then goes positive again.

That's probably pretty tricky, or the signal needs to be altered 1at to make it work better for the analog circuits. I've made basic op-amp integrator's/differentiator's, but I need to learn more on all that.

I bet with a microcontroller, and digital circuits, it's easy if you know programming.

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