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General Mach Discussion / Re: add relays to Break out board schematics
« on: May 31, 2017, 03:39:55 AM »
You need to connect a protection diode across the relay coil and also check the model / rank of the PC817 opto as their maximum drive current rating varies from 2.5 to 30 mA and this will determine the type of relay you could use.
Maybe better to purchase a ready-made cnc relay board ( ebay from China ) ??
Tweakie.
Maybe better to purchase a ready-made cnc relay board ( ebay from China ) ??
Tweakie.