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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TIP31 and TIP32 1W Amplifier (CB25709E)
This small audio amplifier was found in the May 1994 issue of Electronics Now magazine. The power...
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The displayed relay operates with an audio signal applied to the input. The transistors can be...
Photodiode Amplifier 1 (CB13092E)
The circuit shown in the figure and uses the diode in the leakage current operation mode. In it,...