DEVICE FOR GENERATING VARIABLE VOLTAGE

摘要

A device for generating a variable output voltage is disclosed which comprises a MOS field-effect transistor, a nonpolarized capacitor inserted between the gate of the transistor and ground, an output resistor inserted between the source of the transistor and the ground, and a neon bulb, one electrode of which is connected through a control resistor to the gate of the transistor. The voltage across an output resistor which varies in response to the variation in voltage impressed to the gate of the transistor is provided as an output voltage. The device accomplishes the same function of a conventional variable resistor, but the noise caused by the sliding contact of a movable arm with a resistor of the variable resistor may be eliminated. Long service life is ensured and the variation in output voltage characteristic is minimized.