Music box (CB8626E)

This circuit was found in a 90s Popular Electronics. It uses an LS3404 melody chip that has several recorded melodies and that is uncommon nowadays.

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Sawtooth Oscillator (CB12716E)
Sawtooth-type waveforms are typically generated by relaxation oscillators with unijunction...
26 V x 15 A Voltage Regulator (CB12839E)
This circuit was obtained in an Argentine publication in 1976. It consists of a series voltage...
4046 Decay Circuit (CB25769E)
Using a 4046 PLL, which is uncommon today, this circuit was found in the October 1994 issue of...