This circuit is from an 80's Electronic Engineering. The base is a common operating and 4 single integrated voltage comparators. The circuit directly drives 4 indicator LEDs.
The components used in this project from a 1970s publication are no longer common. For the...
The purpose of this circuit is to eliminate RF picked up by a turntable. The circuit is from a...
Despite being from a 1970 General Electric documentation this circuit can be used as a shield if...