This is a field strength meter found in an 80's Hands On. The circuit operates at frequencies up to 500 MHz and has a buzzer as its indicator. Can be used as a detector for spy transmitters.
We found this circuit in an old documentation. General purpose equivalent diodes can be used. The...
This circuit, which combines a bipolar with any JFET, was found in the April 1993 issue of...
June 2017 - Microchip's new PIC18LF67K40 8-bit microcontrollers with Flash / EE / RAM memory and...