![]() Most modern optocoupler devices use a phototransistor as their Rx unit such a device is known simply as an ‘optocoupler,’ since the input (the LED) and the output (the phototransistor) devices are optically coupled. Basic form and application circuit of a typical optocoupler. Basic form of an optocoupler device.įIGURE 2. Here, the Tx unit is a LED, but the Rx unit may take the form of a phototransistor, a photo-FET, an opto-triac, or some other type of photo-sensitive semiconductor element the Tx and Rx units are housed closely together in a single, sealed package.įIGURE 1. Figure 1 shows the basic form of such a device.
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