Phototransistor Circuit Diagram. The other diagrams in this article depict only npn phototransistors. The two phototransistor circuit configurations have slightly different operating characteristics and these may determine the circuit used.
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The circuit shown in figure 1 transforms a photo current produced by a photodiode without bias into a voltage. The output voltage vout is given as vout 1p rl. It is more or less proportional to the amount of incident light when vout voc.
It is more or less proportional to the amount of incident light when vout voc.
The circuit shown in figure 1 transforms a photo current produced by a photodiode without bias into a voltage. The other diagrams in this article depict only npn phototransistors. It is more or less proportional to the amount of incident light when vout voc. The two phototransistor circuit configurations have slightly different operating characteristics and these may determine the circuit used.
