Matching antenna (CB7458E)

The coil and sockets of this circuit found in a QST depend on the frequency band that is intended to be tuned.

Infrared Transmitter (CB14792E)
This circuit generates an audio tone that is transmitted by infrared rays. The transistors can be...
PWM motor control (CB7996E)PWM motor control (CB7996E)
This circuit for some amps was found in a 90s Radio Electronics. The voltage can be between 6 and 25 V...
Cardiac monitor (CB7968E)
Found in a 90’s Electronics Now, this circuit has its output connected to an audio amplifier. The...