Self-biasing JFET circuit (CB25563E)

This JFET amplification stage was found in the April 1993 issue of Electronics Now. The input impedance is 10 Megohms.

Beat Frequency Oscillator (CB4212E)
This beat frequency oscillator or BFO was found in an American 1980s documentation. The circuit is...
Audio Leveler (CB6481E)
This circuit was found in an Experimenters Handbook of the 1990s. The purpose of this circuit is to...
0 to 200 nA Current Meter (CB5281E)
This circuit was obtained from a 2005 Linear Technology manual. It is based on company components...