Sometimes we don't have a clean clock, so let's have a look at a couple of resonators.

Prinsta Voltage Controlled Oscillator (VCO)

Voltage Controlled Oscillator

Not the simplest design, but if you have a DAC (from say a microcontroller like an Arduino) then you can generate a clean Pulse Width Modulation (or Modulated) signal by just varying the voltage input.


What’s the surface mount equivalent?