On Friday 26 September 2014 05:58:37 andy pugh did opine And Gene did reply: > On 26 September 2014 04:28, Peter C. Wallace <p...@mesanet.com> wrote: > > The 7I76 spindle analog out circuitry expects a regulated 5V to 12V > > supply, your supply has about 10K Ohms of series resistance so is > > not a suitable voltage source. You can use an isolated external > > supply of 5 to 12V > > It might be important to stress "isolated" there. The KBIC controller > float the pot at +100 volts or so.
I'll add even more emphasis to this warning. We tend to forget that which Just Works(TM) > One solution is probably a small 12V - 12V isolated DC-DC converter > connected to the normal 12V DC. That is another avenue, and a actually a good suggestion as those are generally less costly than a line transformer powered solution and considerably smaller physically. Since this circuit generally needs less than 20 milliamps, if no 12 volts is available but 5 volts is, there are 5 to 12 converters available too. But they MUST BE TRANSFORMER ISOLATED, the charge pump designs have way too much leakage coupling due to the use of capacitance for the power transfer method. Leakage that can destroy circuitry if accidentally grounded, and kill you if you are the grounding medium. :( Good advice Andy, thanks. Cheers, Gene Heskett -- "There are four boxes to be used in defense of liberty: soap, ballot, jury, and ammo. Please use in that order." -Ed Howdershelt (Author) Genes Web page <http://geneslinuxbox.net:6309/gene> US V Castleman, SCOTUS, Mar 2014 is grounds for Impeaching SCOTUS ------------------------------------------------------------------------------ Meet PCI DSS 3.0 Compliance Requirements with EventLog Analyzer Achieve PCI DSS 3.0 Compliant Status with Out-of-the-box PCI DSS Reports Are you Audit-Ready for PCI DSS 3.0 Compliance? Download White paper Comply to PCI DSS 3.0 Requirement 10 and 11.5 with EventLog Analyzer http://pubads.g.doubleclick.net/gampad/clk?id=154622311&iu=/4140/ostg.clktrk _______________________________________________ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
