On 17/01/2013 7:35 PM, RussellMc wrote: > MC34063 buck is VERY simple. > PIC buck is simple if you are a PIC master with real time switching > experience. Which you may be. Using "feed-forward" (is that even a term?) to alter the PWM should be=20 easy enough as the input voltage doesn't change very fast as far as I=20 know. I probably didn't mention that originally - my apologies. Using feedback with the PIC circuit would be trickier I agree. David... --=20 ___________________________________________ David Duffy Audio Visual Devices P/L Unit 8, 10 Hook St, Capalaba 4157 Australia Ph: +61 7 38235717 Fax: +61 7 38234717 Our Web Site: www.audiovisualdevices.com.au ___________________________________________ --=20 http://www.piclist.com PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist .