Piclisters,

           Just a quick question, what size of capacitor is best used across
supplies? high capacity or low, does it depend on the voltages or the
noise/wave of a signal (e.g. transformers which produce noisy outputs). The
main reason I ask is that the supply to my modem is 9V and I require a
transformer supply to my Pic Programmer, also 9V, but it appears that the
transformer is too noisy for the pic programmer. I also have a noisy 4.5V
transformer for use with my PIC when its on a breadboard. The PIC works fine
with the supply now that I've added a 20uC cap across it, would there be a
smoother supply with a larger/smaller supply?

I'm not looking to make a big discussion out of this ;,)

Mark Craig
m.craig@ntlworld.com
Glasgow
Scotland

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