This universal clock generator is implemented using an Atmel AT90S2313 microcontroller, so it does not require very many external components. It is a versatile clock generator for use in pulse generator and timer circuits in a lab setting. It provides approximately 100 reference frequencies with ‘crystal accuracy’, and it can be used to implement dimmer circuits, generate arbitrary pulse waveforms for simulations, as a freely settable frequency generator and much more. Operation and adjustment are simple and easy to understand.