One-transistor oscillator (CB22064E)

Capacitors C2, C3 and C4 determine the frequency of this simple oscillator. Transistor can be general purpose equivalent.

Linear photometer (CB20721E)
Found in American documentation from the 1970s, this circuit employs an integrated circuit from...
Short Wave Micro Transmitter (CB529E)
This transmitter uses a small loudespeaker (FTE) as microphone and can send the signals to...
Operational Amplifiers Test (CB1500E )
We found this circuit in a 1977 publication. With it we can test general purpose operational...