Light Activated AC Switch (CB25875E)

Using a CA3059 this circuit was found in the July 1995 Electronics Now magazine. The triac must be provided with a heat sink.

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Undervoltage and overvoltage indicator (CB5073E)
This circuit that uses only transistors indicates when the voltage in the circuit has the voltage...
Robot Bug (CB25466E)
This is the circuit of a robot published in the June 1992 issue of Radio Electronics magazine. The sensors...
Tone Decoder (CB5146E)
This circuit was found in a 1980s documentation. It decodes by identifying a certain frequency tone...