Let’s re-visit the voltage meter for a moment - the actual circuit used in the next test differs in a few resistor values, but it’s still essentially the same as the triple op-amp setup described earlier. Here are the two main op-amps involved (omitting the 3rd one, used for the reference voltage):
Let’s inject a 10 KHz square wave into this circuit, and see how it behaves:
The input signal is shown at the top, in purple.
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