Guys thanks for the ideas and snippets. I have not been around today to work on this. I need to up the frequency to 300KHz now to reduce inductor size and value. I was going to use a 20mhz resonator but just wanted to get something up quick and dirty so I used the internal osc at 8mhz.
My schematic is a scribble on a piece of paper at the moment, but its essentially a classic buck converter design that could be found anywhere on the web. I think some of the problem is ripple voltge on the 5v line. This changes the internal vref of the adc.
I'll mill or get the boys in the shop to etch me a pcb in the morning so I can load up on the capacitance and cut down on the noise.
Oh, last night, I killed 12 Osram Dragon infra red led's that are not mine. Oops. I think they are something like $15 a piece![]()
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