Harmonic generator (CB8989E)

This circuit generates a 1296 MHz signal from 100 or 1,000 kHz crystals. We found it in an American documentation for radio amateurs.

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Sinusoidal Oscillator LM3900 (CB15626E)
The presented circuit is a sinusoidal oscillator for 1 kHz that makes use of the four amplifiers...
JFET Headphone Amplifier (CB25567E)
This headphone amplifier has good gain and high input impedance. The circuit is from Electronics Now and...
Random noise generator (CB22377E)
Based on the 4006 this circuit generates random signals in a frequency range that depends on L1...