solarwind wrote: > The thing also works perfectly > without any capacitor at all, As far as you can tell over the limited range of test conditions you have applied to it. Running it without a power supply cap is asking for trouble. The likely symptom is that it works 99.9% of the time. > but that's probably because I'm powering > it from USB. Probably not. > since everyone keeps telling > me to use 0.1 uF. No they haven't. I certainly haven't. As I said before, 100nF bypass caps are so 1990s. If someone tells you that should be the standard value, you should be careful about what other bad or outdated advice they may be dispensing. ******************************************************************** Embed Inc, Littleton Massachusetts, http://www.embedinc.com/products (978) 742-9014. Gold level PIC consultants since 2000. -- http://www.piclist.com PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist