Reference Frequency Switch 7400 (CB22428E)

This circuit is intended to switch two signals of different frequencies that appear at the output. The circuit is TTL and must be powered by 5 V.

Antenna tuner (CB6982E)
This circuit for receiving or transmitting low power was found in old American documentation. It is...
Noise canceler (CB8774E)
Suggested by the 90s ARRL Handbook edition, this circuit aims to reduce or cancel noise at the...
Adapted from capacitance (CB25301E)
This circuit allows you to read capacitances on a common analog instrument. It is part of an...