Optoisolator is a component that is used as a component of the control I / O for equipment that operates with DC or AC voltage. An optocoupler consists of a GaAs LED and NPN phottransistor made of silicon. To use optoisolator circuit can be seen in the image (a) and (b).
In (a) optoisolator get TTL input signal shaped box so that the output signal box, but also in the form of voltage level changed to 0 - +24 volts.
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| Sensor Optocoupler / Phototransistor |
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| Picture Use Optocoupler / Phototransistor |
In figure (b) optoisolator used in the modulated input voltage Vin to Vout isolated peak modulation voltage of +12 V.
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