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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Transistorized Voltmeter (CB21919E)
Found in an old Raytheon transistor manual, this 4-scale voltmeter has an accuracy that depends on the...
Low power current sensor (CB5382E)
This circuit was obtained from a 2005 Linear Technology application manual. The circuit is...
PIC32MM 32-Bit MCUs
August 2017 - The PIC32MM microcontrollers of the Microchip 32-Bit Family can be obtained from...