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Tiny
Tess
Tiny Tess is a very small teslacoil, designed to run
from a 12v supply and to be as compact as possible,
Primary: 5T 1mm emameled copper wire.
Secondary: 3"
tall 0.5" diameter, 500T
on a 5ml syringe former. wound with 0.125mm Wire.
Primary
Capacitor: 1nF.
Spark Gap: Miniture RQ gap from 4mm Dia Cooper tube.
At present Tiny Tess is running from a 5-0-5 kv 20khz
electronic supply, and its giving about 1" arcs to air .
Picture shown with a 'D' Cell to give an idea
of size.
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First
light, running from 12V, Primary cap charging to around
5KV
Its got streamers, its arcing, and it lights a
flourescent tube , it must be a teslacoil!!
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12v - 5Kv PSU Circuit Diag
Here
Psu gives
me 5Kv at 5mA, (So Far.) The whole circuit is in bits, on vero etc
and none of the Mosfets have heatsinks (yet).
Transformer
is 4 turns x 1mm and 2000(ish) turns 0.125mm on an ETD49 core.
Transformer driver borrowed from Steve Connors IGBT
driver
and posts on a full bridge implementation (see Flyback
Driver)
TC resonates at around 3Mhz.
Improvments to be
looked at:-
Less
lossy retification to TC.
Fine tune TC.
RF isolation from
PSU.
Rewind secondary coil with 46 SWG wire (0.04mm
approx).
More Info to come....... |
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In an
effort to get better quenching I tried a rotary, 13mm in Diameter, Driven
from a small 6x6x16 mm motor.
On First trial at full RPM,
I had running sparks up the coil, a good indication of more
power, but bad tuneing.
Corrected tuning, Found it worked better without
Rotary.
:-(
Maybe running rotary much faster will help. Ill use RQ gap for
teting until I'm happy with PSU. Im still getting the HV rectifier
diodes getting hot.
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Added 0.47nF to primary Cap, and
reduced the primary turns to 2.5 Turns
Changed
the top load to a aluminium door knob from Ikea (slowly becomming my No.1 topload supplier :-) ) Varnish removed and polished.
Rectifier
diodes changed to
8kv 10mA ones and doubled up. They seam to be better as
their not getting so hot.
Now getting 1"+
streamers from the topload and hot arcs to earth.
Click images for a larger pictures.
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Picture of the whole project, before tidying up and boxing.
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So Now I'll build another one, add the rotary, maybe DC resonant charging.
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