slippyr4 wrote: > The only thing i'm uncertain of is how long olin's circuit will take > for the waveform to stabilise once i start outputing a square wave. > Anyone with more experience like to take a guess? or is that the sort > of thing that can be simulated? This is something that can easily be simulated. I'd venture a guess that it's not significant. Gerhard -- http://www.piclist.com PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist