This circuit was found in the March 1995 issue of Electronics Now magazine. The circuit requires a symmetrical power supply, and the FET is a common general-purpose type.
The circuit shown in the figure selects signals modulated at a certain frequency. This frequency...
The circuit presented was obtained in the National Semiconductor's Linear Applications Handbook of...
We found this circuit that uses a thermistor as a sensor from the 1991 Electronics Experimenter Handbook....