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In Reply to: Re: Neat Idea.... posted by Monolith on February 07, 2003 at 14:35:46:
Could you do the same thing using silver rod and teflon sheeting? The rod, say 16 guage, would be inserted into the body of the teflon and a second would be placed at a specific distance. The rod could be fastened with conductive epoxy (?)
Follow Ups:
Mike, double sided teflon board material is great for making up trim caps 5-20 picofards or so is all.....Demian Martin used this twenty years ago when he was at Spectral and tough to find really low picofarad values these days in anything decent (sytrene or ppn) other than silver mica so this will be a nice alternative to low stocks of styrene and ppn caps....Just wait 'til you price double sided teflon board material as it ain't cheap nor is sheet teflon....Always ask for "drops", a portion that would normally be thrown away if it was fiberglass...
Bob, where would one look for teflon pcb? I'm in need of a pair of 15pF caps and have looked everywhere for them, can't find anything except for the silver mica, as you mentioned. How big would a 15pF teflon board cap be approximately?
You can also build "gimmick" caps from teflon CAT5 wire for small pf value caps. Take two teflon wires, say 4" long, and twist them together tightly - do not connect the far ends, keep them insulated from eath other of course. The two leads are your caps leads. I usually make a few and connect them in parallel. I fold them up then wrap them with white teflon plumbers tape. You need a meter to measure them to get the correct value. These work great in feedback circuits for me.
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