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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Crystal Controlled Oscillator (CB6186E)
This circuit is from Signetics' 80s documentation. The circuit generates 100 kHz signals according...
500 MHz Amplifier (CB9178E)
This circuit was found in a Motorola documentation from the 90s. The transistor used is uncommon...
Intermittent buzzer (CB20494E)
This two-tone buzzer can be powered by a solar panel. The circuit is from a 1991 documentation. The...