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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3 to 20 MHz XTAL Oscillator (CB13870E)
We found this oscillator in a publication for radio amateurs from the 70s. The circuit generates...
Rhythmic Sequential (CB18165E)
We found this circuit in a 1982 publication, but all the components used are still common in our...
Symmetric 12 V x 80 mA Power Supply (CB13356E)
We found this circuit in a 1976 technical documentation, but it can be assembled with modern...