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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AC Inverter Amplifier MC34071 (CB15277E)
Other series operational amplifiers, such as MC34072, MC34074, MC35071, MC35072, MC35074 d MC33071...
ASCII to Hexadecimal Converter (CB13761E)
This TTL circuit was found in a 1978 technical documentation. The power must be supplied with 5 V....
Automatic shutdown circuit (CB24444E)
We found this circuit in documentation from the 90s. The circuit uses components that are still...