Abstract
A thermostatic control for a tungsten incadescent lamp is described. The circuit employs an operational amplifier feedback circuit to adjust the filament current and thereby achieve a constant filament temperature. The filament temperature is adjustable over a wide range by adjusting a potentimeter. Since the calibration of the thermostat does not, in principle, require temperature or radiometric measurements, the design may be useful in setting up a primary radiometric standard.
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