This JFET amplification stage was found in the April 1993 issue of Electronics Now. The input impedance is 10 Megohms.
The amplifier shown in the figure is indicated for operation with resistive transducers such as...
This circuit, obtained in a 1994 documentation, uses an SCR in a relaxation oscillator to raise the...
Found in Linear Technology documentation, this circuit drains only 70 uA of the monitored circuit....