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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High Input Impedance LM3900 Amplifier (CB14183E)
The figure below shows an AC transconductance amplifier with the National Semiconductor LM3900. The...
Guitar Fuzz (CB26213E)
This common circuit using operational amplifiers was found in the 1993 issue of Radio Electronics Special...
Voltage Switch with Diac (CB13362E)
This circuit provides a voltage at the output only when the input voltage exceeds a value that...