He further explains that, with the Arduino Uno, you can remove the reference capacitor from the circuit, and simply use the stray capacitance present in the board and microcontroller, which can be ...

On one range, the Arduino charges the capacitor through one resistor and discharges it through another while timing the operation. The amount of time taken corresponds to the capacitance.

Capacitance multipliers explained I was interested in the capacitance multiplier included to reduce hum in Allo’s Vana hi-fi amplifier for Raspberry Pi and the firm’s own Sparky computer. So I googled ...