We found this circuit in the 1989 Radio Electronics Experimenter. The circuit uses common components, and the thermistor is supposed to determine the value of the trim potentiometer.
In the figure below we have a typical circuit for applying a current sensor that can be used in...
A quartz crystal-controlled oscillator, capable of operating up to approximately 1 MHz, can be...
This low power, class A circuit uses two old germanium transistors. The circuit was found in an...