Solar Frequency Standard (CB21951E)

This solar cell powered circuit generates a standard 100 kHz signal. The circuit is from a 1960 Gernsback documentation.

Proximity sensor (CB8194E)
Published in a PE Hobbyst Handbook of 1991, this sensor uses an integrated circuit that is unusual...
AM Modulator (CB20772E)
This circuit was obtained in a Motorola manual from the 70s. The integrated circuit is from that...
Isolation Circuit for RS-232 (CB12773E)
In critical applications of the RS-232 interface, the danger of induced voltages in the cables must...