[HayTay]

I'm looking to add a Safety Charge Pump (SCP) to energize/de-energize my Xylotex 4-axis unipolar driver board. I occasionally forget to power off the driver board when I have to reboot my PC and the router starting up unexpectedly, mid-boot, makes my heart skip a few beats.

I know I can purchase a SCP from CNC4PC.com or CampbellDesigns.com. The one from CNC4PC is only $16.81(US) + S&H, but, in keeping with the DIY spirit I'd like to make one. With all of the electronic components I seem to have accumulated I probably have all of the parts within a 10' radius of where I'm sitting. Plus, I'm dying to machine a PCB on my CNC router table.

I've done a bunch of searches and can't seem to hit upon the right keyword combo to nail down exactly what is required and how to cobble it all together. Does anyone have any links or information regarding SCP circuits, SCP design, or SCP PCB layouts, along with the necessary electronic components?

If we can come up with a working open source Safety Charge Pump with component list, circuit design and PCB layout maybe we can get it added to PMinMO's website.


Open to suggestions,

HayTay

[Genguy]

Here is a circuit design to get things started.
The value of the capacitors needs to be adjusted to get things working in the 15 khz range and the output requires a zener diode and relay.
Hopefully this will be of some help.

[smarbaga]

if you are looking for a voltage to frequency converter an 8 pin pic675 with the built in adc could be used up to 5 volts,
a charge pump in electronics brings up low voltage to a higher voltage ( ie: a voltage converter)converts 3 volts to 12 volts , or any voltage to a higher voltage ,
a common example are chips used for laptop battery chargers.
the max232 use a charge pumps to convert 5 volts to 10-12 volts in its rs232 transmitter side.

[ger21]

Here's the schematics for the original Mach1 charge pump. It's posted on the Machsupport web site.

http://www.artofcnc.ca/ChargePumpSafety.pdf