On Sunday 26 July 2015 12:30:42 Jon Elson wrote: > On 07/26/2015 02:51 AM, Gene Heskett wrote: > > Jon; > > > > I have some wall warts for a defunct portable phone charger base > > that measures, no load, 13.1 volts. I am considering using one of > > them for the 12 volts your pwm servo amp needs. > > > > This is not enough overvoltage to make a 7812 work, and if the logic > > draw is 100 mills I expect it will sag to below 13 volts. Is this > > usable as is? > > As long as you can be sure it won't ever surge over 15 V > when inductive stuff is turned off, it should be fine. The > FET drivers and CMOS logic on the PWM amp have no > regulation. I usually test with a "9 V" wallwart power > supply that runs about 11.8 V under that load, but that is > just for the test bench.
On hooking it up to the servo amp today, it makes 11.56 volts with the last digit wandering 20 mv. So it should work. Whole box is now assembled, lid installed after blowing out any drilling debris from making the lid screws, and turned it all on with the switch on a surge arresting extension cord, no smoke, the night light used for a power off bleeder on the motor supply lights normally, which I believe is a good sign. Now I need to get another 5i25 from Peter, its blown something and will not initialize, or reflash. It was pulled partially out of the socket by the data cable while powered up, a definite no-no. Other cards installed in the same slot work fine. I'd clean off the shelf and put it in its final resting place, but its 50+ lbs & I'll rest a bit before I try setting it on a shelf 6 feet up. Some "furniture" yet to assemble, some midden heap to move and dispose of too, so without a 5i25 card, I can spend some time doing that. 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> ------------------------------------------------------------------------------ _______________________________________________ Emc-users mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/emc-users
