Crystal variable oscillator (CB9506E)

Found in Radio Electronics from the 90s, this circuit can vary the frequency in small values around the crystal frequency.

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...