Balanced Modulator MC1594 (CB14588E)

This circuit is from the Motorola Linear Databook from 1990. The integrated circuit used is uncommon today.

Two Transistors Oscillator (CB12657E)
This configuration is very traditional, appearing in several publications around the world. This...
TTL divider by 7 with the 7490 (CB13289E)
This is the normal configuration for dividing a TTL signal by 7. The 7490 can divide by other...
Motion sensor for the blind (CB7875E)
Found in a 1967 Electronics World, this oscillator changes its tone when objects move in their...