17-03-2019, 05:46 AM
I've tried finding the largest amount of micro farad's at a high voltage several times. The cheapest are 470u ish at around 385v/400v, probably due to these being used in PC SMPSU's, for around £3. That's for a 105 deg from decent manufacturer. These are a sensible size too, after that the price goes up steeply.
The problem is, obviously if you use a load of these in series to get a high voltage rated you loose capacitance, which prompted me to have a go making my own high voltage, high capacitance caps using thick poly sheet and copper foil tape and baked bean tins/plaggy pipe. I didn't succeed with the large capacitance, but the caps I made handled over 7kv before they started showing sign's of insulation breakdown.
Andy.
The problem is, obviously if you use a load of these in series to get a high voltage rated you loose capacitance, which prompted me to have a go making my own high voltage, high capacitance caps using thick poly sheet and copper foil tape and baked bean tins/plaggy pipe. I didn't succeed with the large capacitance, but the caps I made handled over 7kv before they started showing sign's of insulation breakdown.
Andy.
