Hi there I have always used an isolated DC supply to power microprocessor stuff, because of the same spike problems. Fit a small DC to DC convertor in between your PSU and the PIC board something like a traco power tmh0505 should be fine.
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Power supply problems
Hi there I have always used an isolated DC supply to power microprocessor stuff, because of the same spike problems. Fit a small DC to DC convertor in between your PSU and the PIC board something like a traco power tmh0505 should be fine.
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Post your schematic;
"If the Earth were a single state, Istanbul would be its capital." Napoleon Bonaparte
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fit suppressors to the hand sander
Go after the noise at source - often a better approach than to try and clean it up when it gets to your board. Sounds to me like the hand sander has arcing brushes. Try a 47 ohm/0.1 uF suppressor capacitor across the active to neutral inside the sander case if possible. Suppression capacitors have a special winding of the capacitor to make it lossy and they work a treat on most noisy brushes.
HTH
BrianT
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