On Sat, Aug 9, 2008 at 9:27 PM, Christopher Head wrote: > -----BEGIN PGP SIGNED MESSAGE----- > Hash: SHA1 > > Wouter van Ooijen wrote: > |> | How often do you need to verify program memory at Vdd limits? > |> > |> ... like the $35 PK2 can? > | > | It can, but only when both extremes of Vdd are well below the voltage > | level of the USB but, which can be below 4.5 V. I would not call that a > | true 'production' grade programmer. > | > > Agreed, it only applies if you know your particular USB port provides > enough voltage to meet the extremes of the target chip's VDD range. > > That said... anyone up for making a tiny circuit (I'm thinking, around > the size of a flash stick) that plugs into a USB port and has a little > tiny switching boost regular, plus maybe a linear, and brings whatever > you have on the port up to a perfect 5V? Just use a powered hub. They come with 5V switching power supplies. Anyway, measure your USB port. The ones I've measured are a little over 5V, except a PCMCIA adapter that supplies 3.3V (!) Regards, Mark markrages@gmail -- Mark Rages, Engineer Midwest Telecine LLC markrages@midwesttelecine.com -- http://www.piclist.com PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist