Car Alarm (CB8925E)

This circuit was found in a 80’s Popular Electronics. The components are common and the 8-ohm speaker.

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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...