Voice Scrambler (CB22462E)

We found this circuit in a Popular Electronics from 1992. It consists of a voice scrambler used in telephone transmissions.

TTL binary adder (CB22430E)
This circuit is based entirely on TTL gates. The circuit must be powered by a voltage of 5...
Beacon Transmitter (CB11952E)
This transmitter operates in the FM band emitting beeps that can be picked up on a common radio at...
Siren Oscillator (CB8449E)
This circuit was found in a 90s European documentation. The circuit already includes a powerful...