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Micro coil specs? pics? (was Micro coil earthing)
Original poster: "by way of Terry Fritz <twftesla-at-uswest-dot-net>" <jduva-at-baytechnologies-dot-net>
I couldn't help it...I had to try and build my own minimicroscopic coil
last night. 22.5W input power, and only 1" arcs to ground....needs some
fine tuning and better gap quenching...better coupling, a top load, better
ground rigid construction, properly terminated wires, a new primary...this
is starting to sound like Ecto-1 before it was all fixed up!
power supply is a 4500V 5ma single coil neon ramped up to 5250V on a 140V
variac. I'm using the ground lead as the second HV lead in the circuit.
secondary is just over 700 turns (5.5") of 33-gauge wire on a .6" diameter,
6" high glass test tube
the primary is two turns of 12-gauge household wire w/insulation and
close-wound on a section of 1.5" PVC pipe
spark gap is 4 copper pipe sections laid out on a glass tabletop, adjusted
manually. One end pipe has a lead from the cap string touching it, the
other end pipe has the end of the primary coils wire touching it (very
cap string of 17 Panasonic Terry caps in series for 3.3nf (recalculating for
a 2-turn primary gives me a needed cap value of 15.6nf....oops!)
The leads are across the HV terminal from the NST and the ground lead from
the NST. Also, the end leads touch the spark gap and the other end of the
RF ground is a small 6" toroid on the glass table top that sits on top of
the extra wire from the bottom of the secondary
the secondary is stood up in the middle of the primary, the extra wire off
the top is held with pliers (calculations used it as a 2" sphere)
maybe with a fan across the spark gap or a whole new gap (I'm in desperate
need for a small-but-GOOD static gap or very minute rotary), 2 strings of 7
caps in series-parallel for 16nf, a real 2" sphere top load, a better ground
(foil everywhere!) and I'll get to see some better sparks! Are there any
actual photos out there of tiny coils working well? I'll post results of
the reworkings as soon as they're done.
From: Tesla list [mailto:tesla-at-pupman-dot-com]
Sent: Wednesday, May 02, 2001 5:48 PM
Subject: RE: Micro coil earthing
Original poster: "Lau, Gary by way of Terry Fritz <twftesla-at-uswest-dot-net>"
>Matt im 16 and built 2TCs a normal 360W one and a really tiny mini
>microscopically small 6W one. got any pics of your one?
6 Watts? Could you share a few more details? What was the power supply
and what were the spark-results?