Balanced Modulator MC1594 (CB14588E)

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

Voltage to Period Converter (CB4817E)
This 90's Electronic Design circuit converts the period of a signal into a frequency. The...
Power on reset (CB7176E)
These reset circuits when the power is turned on were found in an 80's EDN. The circuit also...
FM receiver with BC548 transistor at output (CB23552E)
The receiver shown above was sent in by contributing reader Adriano Muniz Moura and is used for...