In this National Semiconductor circuit, the output voltage is numerically equal to the square root of the input voltage. The circuit is from the 90s and the components are from the period.
The circuit shown is from the Texas Instruments optoelectronics manual, applying to low power...
This circuit was found in a 1968 General Electric documentation. It has an input impedance of 2 M ohms...
This filter that rejects a frequency range determined by the double-T was found in the August 1993...