RE: [TCML] Small coil results

["Thomas Ryckmans" <thomas.ryckmans@xxxxxxxxxx>]

Hello,

I'd be interested to see your 555/IRF740 circuit; mine always seems to fry
when using an ignition coil, despite filter (caps + MOVs).

Also I'd like to see some pictures!

Cheers

Thomas

-----Original Message-----
From: tesla-bounces@xxxxxxxxxx [mailto:tesla-bounces@xxxxxxxxxx] On Behalf
Of Ben Sneath
Sent: 13 April 2008 08:56
To: tesla@xxxxxxxxxx
Subject: [TCML] Small coil results

hello all, you might find this interesting,

Today i managed to get my small 1.75" coil working.
At first, i was getting 3-4" while driving it with a flyback
transformer/555/mosfet(IRF740) driver, then, not happy with
that, i connected this tiny little coil with only 10n tank
capacitance up to a twin mot stack. Thats where things got
loud. It threw white hot streamers straight into the
primary, a distance of about 10" or so (wasn't too worried
about it because i was using a practically indestructable
power supply and an indestructable tank cap).
The funny thing is the breakrate it was running at - 1 BPS
with flyback, FIVE THOUSAND BPS with the mot stack. Now it
may be a terrible waste of power, pumping 2kva into a 1.75"
coil, but, it finally made sparks.
anyways here are the specs:

Power:
unrectified 4kv mot pair, 2Kva

Gap:
5x 1/2" copper couplers 

Secondry:
1.75", 6" winding length 900ish turns

Topload:
1.5x5 toroid (foil covered)

Primary:
6" flat spiral, 6.4 turn
10.5n beer bottle/salt water cap

Sparks:
10" loud streamers, 2 or 3 at a time

ben
_______________________________________________
Tesla mailing list
Tesla@xxxxxxxxxxxxxx
http://www.pupman.com/mailman/listinfo/tesla

_______________________________________________
Tesla mailing list
Tesla@xxxxxxxxxxxxxx
http://www.pupman.com/mailman/listinfo/tesla