In SX Microcontrollers, SX/B Compiler and SX-Key Tool, beazleybub wrote:

The circuit I provided was just an example. I am sure I have the B C E in the wrong places!  :shocked:  
Is the reason for using an opto-coupler instead of a transistor just for BS2SX protection from voltage spikes?

And is it hard to determine which opto-coupler to use?

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