A Phototransistor is an electronic switching and current amplification component which relies on exposure to light to operate. When light falls on the junction, reverse current flows which are proportional to the luminance. Phototransistors are used extensively to detect light pulses and convert them into digital electrical signals. These are operated by light rather than electric current. Providing a large amount of gain, low cost and these phototransistors might be used in numerous applications.
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For a photo transistor , an external voltage source is absolutely essential for operation. For N-P-N , , the photo transistor photoelectric current. Terminal No. General Description , created. The functional element thus produced is called a photocoupler, photo inter rupter or sensor unit. Specifications 1. Figure 1. In this sample task, display on the ,. In this sample. The actual element structures are shown in Figure 12 , that the current generated by light irradiation is amplified by an NPN-type transistor.
In the case of a Darlington-type structure, amplification takes place with an additional transistor stage. Output current characteristics The output current is shown by the photo transistor collector , of the transistor has positive one.
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Phototransistor Basics, Circuit Diagram, Advantages & Applications