Complex 555 based frequency or PWM generator

This seemingly simple module took more time than usual to reverse engineer, as it uses unusual circuitry to allow a variable frequency stream of pulses or alternatively a PWM (Pulse Width Modulation) signal.

The main purpose of the unit seems to be for providing adjustable speed and direction control to a stepper motor driver, but I'm not sure why it also has the PWM option. Perhaps for servo position control?

If you want some of this stuff to play with then here are links to the items on AliExpress (not a sponsor).
These are affiliate links, but that will not affect the price you pay.

The variable frequency or PWM 555 based module:-
https://s.click.aliexpress.com/e/_c3rJygYd
Should cost about £3.

The mini stepper motor driver:-
https://s.click.aliexpress.com/e/_c4pr1efT
Should cost about £4.

The NEMA 17 (1.7") stepper motor:-
https://s.click.aliexpress.com/e/_c4rGC609
Various types - rough price about £10.

As always, shop around for the best deal.



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