Antennoscope (CB21782E)

This circuit works as a useful field meter for radio amateurs. We found it in documentation from 1977.

Ocean Sound Generator (CB25489E)
This circuit called “surf man” was published in the August 1992 Radio Electronics magazine. It...
Oscillator triggered by light (CB20355E)
This Hartley oscillator uses an audio output transformer that can be obtained from small, unused...
Bipolar Transistor Colpitts Oscillator (CB4582E)
The oscillator shown in the figure can generate signals between 3 and 15 MHz approximately, depending...