Simple light intensity meter circuit

Published:2011/6/30 3:48:00 Author:Christina | Keyword: Simple, light intensity, meter circuit | From:SeekIC

The simple light intensity meter circuit is as shown in the figure. The electric bridge circuit is composed of the VT1, R4, R5 and RP1. When there is no illumination, the adjustment potentiometer RP1 makes the balance of the bridge, and there is no current on the ammeter, the ammeter pointer indicates to zero. When the light irradiates on the photosensitive diode VD1, the photodiode shows the different resistances with the different light intensities, so the field effect current flows through the ammeter, the pointer deflects. Figure: Simple light intensity meter circuit



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