Nifty Circuits
Just a collection of circuits I think are nifty.
Table of Contents
Frequency Doublers
A neat frequency doubler. One drawback is that is doesn't work super great when the incoming duty cycle is not close to 50%. (Fasltad sim)
Absolute Value Circuits
A simple single op amp absolute value circuit. But only good if it will be driving a high impedance. Otherwise, you still need a buffer to use it.
A dual op amp absolute value circuit that I've seen around.
NiMH Battery Charging
Basic concept of a NiMH battery charger.
Addition of a "charge complete" indicator LED.
Adding hysteresis and bypassing caps.