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25-07-2018 #11
I’ll do what I can to help, though I’ll have to do a bit of revision as I don’t remember a lot of it.
The one component that I added to ensure separate grounds was a small reed relay: using lpt2 pin 14 for a voltage supply and grounding it using pin 1 let the relay output switch the vfd on & off. Pin 18 sends the variable voltage to the vfd for the variable speed.
How far have you got yourself?
Gavin
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