Olin Lathrop wrote: > With all this in mind, I wanted to see what kind of hardware it would > take to implement a basic programmer. The schematic I came up with > is at http://www.embedinc.com/pic/prog.pdf. I'd be interested to > hear if I missed any gotchas from those who have been down this road > before. Would it be worthwhile to provide a voltage divider in the feedback loop around IC2A, to allow Vdd to be driven 5% or 10% *above* the nominal value during program verification? High-end device programmers do this, but maybe it isn't necessary here. -- Dave Tweed -- http://www.piclist.com hint: To leave the PICList mailto:piclist-unsubscribe-request@mitvma.mit.edu