Found in a 90s Popular Electronics, this circuit uses a MAR-X to amplify signals up to 2 GHz. The circuit is quite critical.
This voltage regulator for low current applications (a few milliamps) is from a European...
Found in old documentation this circuit uses the NOR ports of 4001. The circuit has the frequency and...
This circuit was found in a 1968 General Electric documentation. It has an input impedance of 2 M ohms...