This circuit can work with almost any JFET. The circuit is from an Electronics Now from April 1993. It is powered by a 12 V battery, but can also be powered by 9 V.
This RF signal meter has a switch position that allows calibration and comparison of low intensity...
April 2017 - Texas Instruments bq51222 integrated circuit for chargers and other Qi wireless power...
We found this circuit in an American 1980s documentation. The circuit can be easily assembled in our...