This 80's Exar circuit has a carrier detector for frequencies up to 500 kHz. The circuit uses a company 567 which is still a common component.
Suggested by the General Electric Hobby Manual of 1965 this circuit measures voltages from 0 to...
We found this voltage regulator for 5 V with current up to 10 A in an old manual of integrated circuits....
The basis of this circuit is a National Semiconductor operational amplifier that functions as a...