Complex 555 based frequency or PWM generator @bigclivedotcom

Complex 555 based frequency or PWM generator @bigclivedotcom

Uploaded July 2026 | Updated September 2026, 2 weeks ago

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.

If you enjoy my videos, supporting the channel on Patreon helps keep it independent of YouTube's quirks, avoids intrusive mid-video adverts, gives early access, bonus footage and regular quiet Patreon live streams.

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#ElectronicsCreators

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Complex 555 based frequency or PWM generator