Balanced Line Driver (CB6223E)

This 600-ohm line driver was found in a 1980s documentation. The integrated circuit used is not common today.

CW Short Wave Transmitter (CIR813E)
This small experimental transmitter can send its signals to distances up to 100 meters. L is...
Frequency to voltage converter (CB6961E)
This circuit is from an old Elektor using components that are not currently common. The circuit is...
5A DC contactor (CB9271E)
This circuit was obtained in a Motorola documentation from 1968. The circuit uses a power...