See page 4 of the datasheet here: **broken link removed**Īdding a resistor between the base and emitter connections of the opto transistor will speed it up a bit but also decrease it's sensitivity. no more than 1% of your cycle time, for optimum efficiency. Unfortunately the MCT2E opto is a very "slow" device, according to the datasheet it can take up to 50uS to turn off. Normally, the opto transistor should be between the base and +12V, with a series resistor to set the "on" current to the base, plus a base-emitter resistor on the transistor to ensure turn-off. That's not a good design as it means the switching point is around 0.6V
You are trying to short out the first transistor base with the opto-isolator.
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