Thread: CNC 3020 Enclosure/Upgrade
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21-02-2014 #1
Hi Les,
Nice to see it all coming together nicely for you :)
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22-02-2014 #2
Thanks Kris, I am getting there, slowly!
Charge Pump continued...
I ran a quick test this morning and the charge pump circuit worked fine through the opto-isolator. While I was testing the circuit, it occurred to me that my Estop flip flop on the IO board was no longer needed. It also occurred to me that I could use the Estop switch with the charge pump, to make a true hardware emergency stop. All I needed to do was take the NC side of the Estop switch to +5v, the NO to Gnd and the Common to Pin 5 of the 4538N. I also added a bi-color LED indicator and a 2 pin connector to take a feed over to the IO board so that Mach3 knows when the Estop occurs.
Here's the 3rd version of the circuit...
As I now have a PC PSU inside with ample 5v & 12v lines, I can also loose the 5v regulator circuit from the IO board. Hopefully this extra space will allow me to use some proper connector blocks. I simply didn't have space to fit them before, within the free version of Eagle's size limit (100mm x 80mm).
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