plasma control panel

rodw wrote: I'm not sure many do add it as its a fairly recent learning. I think his build predated that point.

In this thread, post #134766, he had a 220 ohm in the schematic. By post #148670 there was no resistor. That was the one I was asking about... just to make sure we are talking about the same thing.

I think a better idea is to do as PCW suggests and use a 1uf capacitor.

forum.linuxcnc.org/plasmac/40819-arc-ok-...fire?start=50#191678

phillc54 wrote: I think a better idea is to do as PCW suggests and use a 1uf capacitor.

forum.linuxcnc.org/plasmac/40819-arc-ok-...fire?start=50#191678

I read what PCW had to say... it's a little bit above my pay grade. Is he (I assume it's a he) saying that the 1uf cap would prevent the problem that the OP (and others) were trying to correct with resistors? ... I believe it was the buildup of some sort space dust in the flux capacitor they were trying to blow off.

txtrone wrote:

phillc54 wrote: I think a better idea is to do as PCW suggests and use a 1uf capacitor.

forum.linuxcnc.org/plasmac/40819-arc-ok-...fire?start=50#191678

I read what PCW had to say... it's a little bit above my pay grade. Is he (I assume it's a he) saying that the 1uf cap would prevent the problem that the OP (and others) were trying to correct with resistors? ... I believe it was the buildup of some sort space dust in the flux capacitor they were trying to blow off.

Did someone mention a dusty spaceship?

Yes, if a relay is switching a low current, space dust or oxide can build up on the relay contacts which can result in intermittent/failed operation. The relay manufacturer's specify a minimum current that is sufficient to "burn" off the oxide so it does not form.

rodw wrote: Did someone mention a dusty spaceship?

That was your cue!