Combined Light and Dark Alarm 741 (CB25480E)

This circuit detects a light window using two operating systems. The circuit is from a July 1992 Radio Electronics.

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Heart Monitor –Transmitter (CB25406E)
This circuit was found in a Radio Electronics magazine from November 1991. The circuit operates at 2.2...
12 V Source from Battery Charger (CB1173E)
12 V battery chargers provide higher unregulated voltage. With the regulator shown, obtained from...
Relaxation Oscillator (CB4603E)
The indicated circuit generates frequencies in a range from approximately 500 Hz to over 5 kHz...