This amplifier for instrumentation with very high input impedance was found in a manual of JFET circuits. The operational ones used are current and the power supply must be symmetrical.
Found in a magazine 73 for radio amateurs of the 90s, this circuit shows how to supply a photo...
This normally open, two-terminal, high-sensitivity circuit was found in General Electric's...
This high-power amplifier that comes close to 400 W peak uses unusual high-power transistors...