Photoelectric alarm with LDR (CB23799E)

This circuit was found in Radio Electronics magazine from February 1962. The sensor is an LDR, and the power comes directly from the power grid.

RF Pulse Generator (CB4132E)
This high frequency pulse generator was found in an old American documentation. The circuit makes use...
Amplifier MC14546 (CB20041E)
This small 1 W amplifier uses a Motorola integrated circuit from the 1970s. The integrated circuit...
Triac Heating control (CB21372E)
We found this circuit in a 1966 RCA manual. The integrated circuit is unusual, and the Triac must...