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.

Multiple Feedback Band Pass Filter MC3403 (CB15266E)
The operational amplifier used in this configuration is uncommon today, but more modern types can...
Dynamic Microphone Amplifier (CB4729E)
This is a circuit that appears several times in this section and in articles. It is a preamplifier for...
4046 Narrow-Range VCO (CB25755E)
We found this circuit in the August 1994 issue of Electronics Now. The 4046 is unusual today. The...