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

Chris,

I'm really glad to learn about your success!

To be honest, a while ago, I had a look at a "vintage PLC board", and I noticed that all the input opto isolators had 15µF Tantalum caps in parallel. This gave me the "push" to try the same on my own boards. Seems as if this also works out fine for you. Too bad that I don't know who developed this "vintage PLC board" - I think (s)he deserves a couple of free drinks - at least :-) .

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