Tricky indeed. That is why I decided that Mr Wallace is the expert and I use his stuff when it comes to servo's. Well whenever it is my choice to make, I use the Mesa stuff. It just works.
On 2013/07/12 07:25 PM, andy pugh wrote: > On 12 July 2013 18:16, Marius Liebenberg <[email protected]> wrote: >> Stupid question Andy. How do you get the -10v from this circuit? > Ah. I am getting confused. > You don't. That circuit (and the other one I came up with with a pair > of optos) only gives you 0 to X volts. I have only ever used it to > drive a VFD. > > +/- 10V is more tricky, (and offset PWM is not a great way to do it). > PWM + DIR is a safer approach as then you don't get full-scale at > power-off. > -- Regards / Groete Marius D. Liebenberg MasterCut cc Cel: +27 82 698 3251 Tel: +27 12 743 6064 Fax: +27 86 551 8029 Skype: marius_d.liebenberg --- avast! Antivirus: Outbound message clean. Virus Database (VPS): 130712-1, 2013/07/12 Tested on: 2013/07/12 09:19:56 PM avast! - copyright (c) 1988-2013 AVAST Software. http://www.avast.com ------------------------------------------------------------------------------ See everything from the browser to the database with AppDynamics Get end-to-end visibility with application monitoring from AppDynamics Isolate bottlenecks and diagnose root cause in seconds. Start your free trial of AppDynamics Pro today! http://pubads.g.doubleclick.net/gampad/clk?id=48808831&iu=/4140/ostg.clktrk _______________________________________________ Emc-users mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/emc-users
