Feature: Optocouplers


Figure 1: A typical opto-isolator circuit, discussed in the text


Figure 2: Voltage overshot starts to rise at the emitter of phototransistor of OC1 (blue trace) with a delay of below 500ns after a low-to-high transition of the input voltage (yellow trace)


www.electronicsworld.co.uk July/August 2021 45


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