TTL Counter (CB21360E)

This counter from 0 to 9999 was found in English documentation. The power source must be 5V with at least 1A.

Spy Tunnel Diode Transmitter IV (CB19428E)
This low power circuit for the FM band was found in a spy book from the 90s. The tunnel diode is...
Low Pass Filter or Integrator (CB13209E)
This circuit was found in an old Motorola documentation from the 70s, as it uses one of its...
Smoke detector (CB8262E)
Suggested by General Electric in a 1970 documentation, this circuit makes use of some components of...