Guitar Distorsion Pedal (CB18205E)

This simple circuit with two transistors was found in a 1985 publication. The power can come from batteries or battery, as consumption is very low.

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Soldering Central (CB16386E)
This simple circuit was found in a 1981 publication. As readers can see, we have an H switch and...
Water Tank Electronic Float (CB17265E)
This circuit is from 2001 documentation with the purpose of controlling a pump that fills a water...
Micro metronome (CB20743E)
This simple CMOS metronome circuit can be mounted in a small box, providing both sound and light...