Cursed circuits: a capacitance multiplier

The lca,tuf’s thing blog takes a look at a capacitance multiplier circuit.

It’s the kind of a circuit that usually doesn’t make sense at first glance because we can’t pattern-match it to anything we know:

Section A is just an op-amp configured as a voltage follower. No matter what else is going in the circuit, it takes some voltage from section B and then mirrors that signal on its output leg.

Section B is a capacitor that’s charging through a resistor; the voltage across the capacitor’s terminals (Vcap) will change over time.

See the full review in the post here.

from Adafruit Industries – Makers, hackers, artists, designers and engineers! https://ift.tt/HiV5mAD
via IFTTT