This circuit was found in a 1970 IEEE publication. The circuit functions as a voltage controlled variable resistor and can be used with audio signals. Transistors admit current equivalents.
Using 18 or 24 MHz crystals, this circuit is intended for producing reference signals with...
This circuit was obtained from a Linear Technology manual from the 1990s. The sensor is of the...
This circuit is from the manual of the used operational amplifier itself. The same setting can be...