Quick Adder (CB20155E)

This is a factory circuit from an 80's manual. The circuit can be implemented with modern operationals and the power supply must be symmetrical.

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Tunable Filter from 700 to 1kHz (741) (CB13446E)
This circuit is from an American publication from 1975 and can use other operational amplifiers and...
Simple Audio Generator (CB15043E)
This circuit generates audio signals for testing amplifiers and other equipment. The potentiometer R5...
CMOS Stabilizer (CB8857E)
This circuit was found in a 90s EDN. In it we have the use of LEDs and diodes to stabilize the supply...