Found in American documentation this circuit uses transistors of the time. The circuit can be made with current components. It works as a trigger working with 600 ohm signals.
This capacitor for small capacitances is based on the tuning of a receiver circuit. The variable is...
This 1995 documentation circuit detects when an extension on a phone line is active. Adjustment of the...
This analog tachometer can be used in cars with platinum or in robotic and automation applications to...