P
Paul Burridge
- Jan 1, 1970
- 0
15 turns on a T50-2 toroid gives about 1.1 uH. That's probably close
enough and will take you a couple of minutes to make.
Oh, I had the dimensions and all that, thanks to Remarkable Reg's
"Solnoid2" (sic) program for working this type of thing out. On the
former I used I turned out to be 19 turns, but a ferrite slug knocked
that back to 16 and that's what I went with. Most of the problem was
in getting the bloody wire to stay on the former. I tried varnish,
superglue and model enamel before admitting defeat and taping the
bloody stuff in place, which of course looks shite. Finding suitable
enamel wire was another time-consuming pain in the arse! Then trying
to resonate the things with a known 1% capacitor against my grid dip
oscillator (which for some reason works brilliantly only on certain
frequencies and not of course the one I needed) which I had to give up
on and turned to a combination of signal generator, series resistor
and 'scope - a *vastly* easier way of seeing exactly where the
resonance was. So I'm *determined* to use those bloody coils!