On 14 July 2011 16:59, For Sale Sticker <e...@forsalesticker.com> wrote:
> 1 - What guage of wire should I use to go from the break out board to the > drivers? I have some wire from a cat 5 cable but it seems very tiny - should > I use something fatter? The parallel port can only source a few mA, there is no way that it can overload Cat5. > 2 - The power from my power supply (very top right in the photo) I see two power supplies, There is the big transformer feeding a capacitor (the blue thing) through a bridge rectifier to make a tough, unregulated, Stepper supply. Then it appears that some other windings go to the switchmode board, which will give a smooth, regulated supply for the logic components. > So my break out board is asking for ground and power (+9 to +24 V) > Can I assume that black is power and white is ground? Try assuming the opposite, or it will rapidly get expensive. Black is only "live" in the latest EU-harmonised 3-phase wiring scheme (And don't get me started on the insanity of _that_) > Is there a good method to test this using a simple multimeter? If you connect the +ve lead of the multimeter to +12V and the -ve lead (often also marked "COM") to Gnd, then the readout will be 11.7V. If you swap the wires, the readout will be -11.7V. Generally the +ve lead on the multimeter is read and the -ve is black, but you are also generally quite at liberty to plug them in the wrong way round. -- atp "Torque wrenches are for the obedience of fools and the guidance of wise men" ------------------------------------------------------------------------------ AppSumo Presents a FREE Video for the SourceForge Community by Eric Ries, the creator of the Lean Startup Methodology on "Lean Startup Secrets Revealed." This video shows you how to validate your ideas, optimize your ideas and identify your business strategy. http://p.sf.net/sfu/appsumosfdev2dev _______________________________________________ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
