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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Telegraphy Practice Oscillator (CB18342E)
This very simple oscillator, with only one transistor, was found in a Japanese magazine in 1967....
Simple sound bridge (CB6069E)
This simple bridge circuit can be used for impedance or resistance measurement using a high...
Light-controlled oscillator (CB7874E)
This circuit has the intensity of the signals controlled by the light that falls on the sensor....