Thread: CNC 3020 Enclosure/Upgrade
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21-02-2014 #1
Thanks for the links Ed.
I must have had a real brain fart when I did the charge pump circuit above. Apart from getting the PC power connector the wrong way round, and a couple of other small errors, I made a major mistake with the relay. It's SPDT, so the above circuit makes a direct short across the 24v input, whoops! There's obviously a very good reason for bench testing circuits first, and fortunately I always have the current limiting control on my bench supply turned way down in the milliamp range, so no damage was done. Anyway after a quick couple of tweaks the circuit worked beautifully on the breadboard, I have only tested it connected straight to the BOB, so I just need to make sure it works, through the opto-isolators on the IO board
Here is the second version of the PCB...
Regards,
Les
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