Hi
An old video of my first little tesla coil. Ignition coil powered, 4 cm diameter secondary, 20 cm long with 0.25 mm enamel wire, 6-7 turns primary, 7 cm dia. sphere topload aluminium foil covered, 3.6 nF primary cap, 3-4 inches arcs. Many thanx go to Bert Hickman for help. It was a nice coil to play with. It is disabled now, but the secondary is used in one of my tiny VTTCs.
https://www.youtube.com/watch?v=VS-iRY3H5S0
vasil
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On Wed, 1/16/19, Gary Lau <glau1024@xxxxxxxxx> wrote:
Subject: [TCML] Let's Get Small
To: "Tesla Coil Mailing List" <tesla@xxxxxxxxxx>
Date: Wednesday, January 16, 2019, 3:08 AM
With apologies to Steve Martin, I was hoping
to inspire some discussion on
the small end of the Tesla Coil
spectrum. Not to suggest it's easy but
everyone knows if you throw 10KVA into
a coil, you're eventually going to
get some big sparks. Not much has
been shared about the other end of the
spectrum.
Several years ago I threw together a
palm-top sized coil powered by a yard
sale bug zapper transformer. Bug
zapper transformers are built just like
NST's, current limited but tiny.
Inspired by the recent Little Coil
thread, I dusted it off and made some
primary coil tweaks and adjustments,
and finally got around to taking some
pictures. The performance is OK-ish,
maybe 2" to a nearby screwdriver, but I
was really hoping to get some
similar sized sparks just wandering
about the topload. Yeah I have plans
to tweak some more, although such a
small 4-turn primary is difficult to
adjust. Looking for that round
tuit.
Well, I was hoping to hear other
successes in the micro-sized league and
what might be attainable.
Pictures and a short video are at:
https://drive.google.com/open?id=1q83wHgtXXlpcKSobd8bXSQ1ZlmvlK3zp
Specs:
Power source: 4.8kV/8.7mA Bug Zapper
Transformer, modified to remove the
potted built-in ceramic capacitor
across the secondary.
Primary C: .0094uF/8KV MMC (5x
47nF/1600V)
Primary L: Helical 4 turns PVC
insulated 18AWG solid wire
Secondary L: 0.84”D x 4.43”L x
#38AWG – 3.37mH
Top load: Pine disk, turned on drill
press to form .75” x 3.4”
pseudo-toroid, Al tape covered
Spark gap: Single cylinder gap, .020”
separation
Performance: 2.25” to a screwdriver
blade (very little tuning performed)
Regards, Gary Lau
MA, USA
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