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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FM Booster (CB26081E)
We found this circuit in the December 1998 issue of Electronics Now magazine. RF transistors such...
Temperature to frequency converter (CB9611E)
This circuit was found in an American documentation from the 80's. The sensor is a special...
Automatic Lighting Control (CB17427E)
This circuit automatically controls the degree of illumination. As the circuit is from 2001, it...