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Registered Member #2123
Joined: Sat May 16 2009, 03:10AM
Location: Bend, Oregon
Posts: 312
A simple circuit from my youth was to use a little DC PM/brush motor wired in series with the secondary of a speaker transformer. The primary would put out some pretty good sparks. This was a small tube radio-type speaker transformer, kind of hard to find these days though.
Registered Member #509
Joined: Sat Feb 10 2007, 07:02AM
Location:
Posts: 329
Ive tried making a triggered spark gap in a potato gun chamber from a disposible camera flash... it sucked, worked alright (80% of the time) in air, but never worked to ignite the mixture. Had tungsten electrodes too. :) Is propane more insulating then air?
But just ask for a whole bag full of disposable cameras, move the transformer/transistor/resistors portion of the circuit from one onto a piece of prototyping board, then build a 10+ stage multiplier off the output of the transformer, using the 22nf foil caps (for the trigger circuit) and the HV diodes (on the output of the main transformer normally) Thats what I did for mine and its works pretty well, I think I have ~25 stages, but I suspect that it gets to a point of diminishing returns, and that is well below 25.
In my latest one though I just cheaped out and purchased a $15 stun gun, soldered leads to its output terminals, (dont alter the gap on them, it can overvolt its self) and put it in a plastic project box and put some Binding posts on for the output. Larger, but faster, and more 'scientific' looking then my taped up bundle of HV wire :)
Registered Member #1038
Joined: Mon Oct 01 2007, 08:02PM
Location:
Posts: 96
I have a tiny ignition coil from an ATV, it's about the size of a C or D cell, but it makes a nice spark when you discharge a capacitor though it. I got it to work at 12v with a 2uF cap, though it made much bigger sparks from discharging a photo flash cap though it...
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tiny ignition circuit
