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Bangbox Ok, I call this thing simply the bangbox, because that is what it does when activated. Producing loud bangs. It actually is a high energy ignition system. And I think it cannot be built much simpler. This is what it looks like, not yet fit with the large storage capacitor, but only 100nF instead.
This picture shows the bangbox with a micro spark plug as used on small model aircraft IC engines. The plasma extends approx. 3mm from the gap and is really hot.
And this is how it works (click on the schematic for a larger version):
These are the two transformers. The left one is the flyback transformer, primary 10 turns of 2 x 0.5mm dia bifilar, secondary 100 turns of 0.3mm dia, 4 layers with layer isolation. The core has an air-gap of 0.5mm. The right one is the Tesla transformer, secondary 20 turns, 2 1/2 layers, primary 4 turns, no core air-gap. The wire is 1mm dia silver plated copper, threaded into a PTFE tubing with 1.1mm inner dia. Both cores were recycled from power transformators, salvaged from blown desktop PC power supplies. They are approx. 40 x 35 x 12mm3 in size and are of N27 material. You can download the CAD file for this device here. The circuit has been designed with Target 2001 by Ingenieurbüro Friedrich. They offer a free demo version of this program at their web page http://www.ibfriedrich.com . The demo is only restricted in component count and should be more than sufficient for this circuit. An English language version is also available, as is the documentation. To be continued as I get hold of a larger capacitor.
09/25/2000
If somebody needs one of these capacitors - I still have some left and will sell them cheap. Just been experimenting a little bit more with the bangbox: I placed a kleenex, soaked with kerosene, between the electrodes and connected the power. The kerosene lights easily. So I think it should light a turbine combustor as well. Now my ears are ringing - I’ll better put on ear defenders next time.
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