According to Marcel Duchamp on Wed, 01/23/13= at 11:47: > > You could get the same results from a supply that is nothing more than a= =20 > step-down transformer followed by either a half-wave or full-wave=20 > rectifier. The average voltage may well be 4.5V; this says nothing=20 > about peak voltage. And yes, Digikey and many other vendors do sell=20 > wall warts that operate like this. Thanks. So looking at the 4.5 VDC with an oscilloscope looks like the next step. If the 4.5 VDC is shown to not be so DC as one would like, what should I do? If I toss the DigiKey el-cheapo wall wart, what should I replace it with? And what about the previous comment about "blowing out the LEDs" if the replacement power supply can not emulate the internal impedance of the AA alkaline cells? Regards, web... --=20 William Bulley Email: web@umich.edu 72 characters width template ----------------------------------------->| --=20 http://www.piclist.com PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist .