Light Activated Alarm (CB26164E)

This circuit was found in the 1991 Electronics Experimenter's Handbook. It activates a relay when light shines on a sensor.

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Wien II Bridge Oscillator (CB4924E)
This circuit generates signals from 0.01 Hz to 10 kHz, but uses unusual components today. The...
Ramp Generator (CB1434E )
This circuit was obtained in a 1973s documentation. The transistors may be BC558 for the PNP and...
BCD to 7-segment decoder (CB25202E)
This CMOS circuit for LED displays is from a Radio Electronics magazine from February 1989. The...