Car Alarm (CB14448E)

The transistors of this circuit found in a 1965 magazine can be the BC558 and the sensitive 12 V x 50 mA relay. The other components are common.

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Signal generator (CB23768E)
Aiming to generate signals in the bands used for maritime communications, this signal generator was...
Simple Power Supplies (CB20187E)
In the figure below we have the main configurations of power supplies with the most used...
Motor photoelectric control (CB8022E)
This circuit was found in a 1964 Electronic Design. The components are from the era and the load...