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.
This transmitter is modulates a infrared light source from an audio signal. Applications include a...
This turntable filter was found on an 80's Elektor. The circuit makes use of operational features...
This circuit is from a Radio Electronics magazine from May 1989. The power supply must be...