Astable Multivibrator: Hairball Edition

Just to show all those precisely machined enclosures and tidy hand-wired boards don’t count for much:

Astable Multivibrator - as-built
Astable Multivibrator – as-built

The schematic again:

Astable Multivibrator - as-built - simulation
Astable Multivibrator – as-built – simulation

It started with that idea and evolved slightly.

5 thoughts on “Astable Multivibrator: Hairball Edition

    1. A guy I know built a wall-following robot with one transistor (none of this fancy microcontroller stuff for him), so the parts you see here could become a robot controller with redundancy

  1. Okay, why D3 and D4? I’ve built this circuit many a time, but without them.

    1. The base-emitter junction breaks down at about 6 V reverse bias and there’s no current limiting through the caps when the collectors saturate; IIRC, they don’t quite reach breakdown with a 9 V battery, but the diodes may save some wear & tear.

      1. Makes sense. I’m working off 9V so I didn’t consider reverse bias too deeply.

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