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More development. Replaced the power transistors with logic level MOSFET's and removed switching to the Arduino - 12v on, Arduino on, so I don't forget it. The switches can be hardware or digital output from the Arduino, but this means more debounce programming for any pushbutton logic - so I think, hardware?
The big and small caps on the 12v supply are actually fixed to the PSU terminals. I put them in the schematic to see if there was any effect. 5v supply will be an inbuilt PSU for the switches.
Thoughts on this setup appreciated. Practical, not practical, too complex for the application?
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