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 circuit for voltmeter has an output of 1 V for 100 uA having been suggested by American...
This low-power audio amplifier was found in the April 1973 issue of Radio Electronics magazine. The...
This circuit makes use of germanium transistor, but can be mounted with a silicon transistor like...