Multiplexed AD Converter (CB9023E)

This 8-channel converter was found in a 1970s American documentation. The integrated circuits used are not common today.

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Optocoupler Code Practice (CB26321E)
This ingenious circuit was found in a 1990s Popular Electronics. The oscillator is a 555 and the...
Two Inputs Stepper Motor Control (CB23787E)
This circuit consists of a variation of the previous one, with the difference that we only have...
Transistorized 1 kHz Astable (CB25323E)
This circuit generates a good-intensity 1 kHz rectangular signal. The circuit is from Electronics Now...