SCR photo control (CB8276E)

This circuit is from a 1968 Electronics World. It acts directly on a high voltage alternating current relay. The sensor can be a common LDR.

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Triangular Signal Generator (CB19523E)
The integrated circuit used in this configuration is uncommon today. The diodes are for general use...
Oscillator (CB6000E)
This oscillator or clock generator generates rectangular signals and frequencies up to 100 kHz....
13 V x 5A power supply (CB16891E)
This power supply with transistor regulation was obtained in a 1995 documentation. The power...