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.
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