Bidirectional buffer (CB9317E)

This circuit was obtained in a 90s Electronic Design. The circuit uses components from that time.

Shortwave Converter (CB24017E)
This circuit is from a Radio Electronics from March 1970. The crystal depends on the frequency at which...
Magnetic Field Detector (CB25980E)
This circuit detects magnetic fields through a sensor coil, providing a signal in its function. The...
Intercom amplifier (CB23690E)
Described in an article that taught how to assemble the complete intercom in Radio Electronics magazine...