Tone Oscillator (CB22066E)

Found in old documentation, this oscillator with the LM380 produces an audio tone in a speaker. Frequency is set in VR1.

Phase inverter (CB22232E)
Used in audio circuits in the excitation of output stages, this circuit provides audio signals with...
Hum Filter (CB10657E)
This circuit was obtained in an English magazine from 1978. We can easily assemble it because all...
Wavemeter (CB15830E)
We found this circuit in an old documentation from the 70s. The text is the original one of the...