Sawtooth generator (CB21338E)

This op amp circuit is based on a 555 IC and two common op amps. Transistors are general purpose.

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...