- on Miscellaneous Electronics
- Published in issue 12/2000 on page 0
0-2 µF Variable Capacitor
This circuit makes it possible to simulate a variable capacitance, with the value set by a potentiometer. The amplification stage around IC1b has an adjustable gain, which can be set between +1 and –1 using P1. IC1a is an impedance buffer, which makes the ultimate converted capacitance as close as possible to an ideal capacitance.