Unijunction rectangular generator (CB9248E)

Found in an Electronic Design of 1964, this circuit operates with control voltages from 0 to 12 V determining the duration of the pulses.

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Micro metronome (CB20743E)
This simple CMOS metronome circuit can be mounted in a small box, providing both sound and light...
Capacitance Switch (CB4993E)
Although indicated in the original publication of the 1980s as a capacitance switch, the circuit...
Chroming with Solar Energy (CB18492E)
In the figure below we have a simple way to do chroming, silvering or another type of...