High impedante circuit for sensor (CB20542E)

This circuit for PC and which can also be used with microcontrollers was found in an English documentation from 1992. A font must be symmetrical.

Complementary Mini Amplifier (CB970E)
This simple circuit was found in the Spanish magazine “Todo Electronica”, in an edition of 1996....
Precision Diode LM101 (CB4607E)
The basis of this circuit is a National Semiconductor operational amplifier that functions as a...
LC Oscillator Using the 40106 (CIR092E)
A high-frequency square wave oscillator using an LC-tuned circuit is shown here. The upper...