small tesla project

[nievesoliveras]

I have wo questions:

1. Is this possible?
2. Can anyone with the circuit already done and an extra flyback can try it?

Jesus

Ps
Also two 9v batteries can be used instead, changing the 100ohm with a 1k.

[kooler]

I have wo questions:

1. Is this possible?
2. Can anyone with the circuit already done and an extra flyback can try it?

Jesus

Ps
Also two 9v batteries can be used instead, changing the 100ohm with a 1k.

i don't know about feed back but i do know.. that i had the same setup with a 9 volt
and by adjusting the spark gap closely.. you can get the input draw down to 20 ma's and still have a good spark..
i was getting 281 volts from ferrite transformer i made on the SG side.. but i didn't try to feed back..
but i will try after turkey day..

robbie

[nievesoliveras]

I will wait to see your results. It would be great if it works right!

Jesus

[xee2]

My circuit drawings had the wrong part number for the transistor. The correct part number for the Jacob ladder transistor is MJE13007. Sorry, I have a bad habit of leaving out one zero.

[TinselKoala]

Neat stuff ! I love a little Jacob's Ladder.

Here's mine, using a 555 timer as the oscillator (so as to be able to vary frequency and duty cycle), switching a 2n3055, driving an ordinary 12v automotive ignition coil.
http://www.youtube.com/watch?v=VNL8QTS0sM0

I've got another one, using a more complicated circuit and a CRT flyback, that is audio modulated...it "sings" when plugged to an audio source. The amazing thing is that the sound begins to occur, with great fidelity but low volume, at voltages that are just short of making a visible spark.

The key to getting big voltages from your secondary is to switch your primary with as fast a rise/fall time as possible: that is, as square-edged pulse as you can manage. (Induced voltage is proportional to the rate of change of the inducing field).
For really _really_  high voltages, then, it follows that you need to avoid saturating your secondary cores with your driving pulses, and that these cores have to be low in inductance. Hence, the use of air core coils, which make it possible to take full advantage of VRSWR (voltage rise from standing wave resonance) in tuned, matched coils driven by square-edged pulses.
With flybacks and auto ignition coils, with their heavy inductances and saturable cores, it's hard to get over 50 kiloVolts; 20 or 30 kV is more like the usual operating range. The same circuit, driving tuned quarter-wave aircore resonators, can get close to ten times that voltage.