This circuit was obtained in a 1975 documentation. The maximum frequency depends on the diodes and the FET. Type 1N34 diodes and a FET BF245 can be used for frequencies up to 100 MHz.
What differentiates this circuit from the previous one (CB12689E) is the non-need to use a...
This simple metal detector was found in a 1960 Sylvania transistor manual. The phone must be high...
Found in a 90s Popular Electronics this circuit has its gain given by R2. This component can be...