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Registered Member #579
Joined: Mon Mar 12 2007, 09:45AM
Location: Burntwood, Staffs, England
Posts: 46
I have just fnished a new build I though I would share with members It is the well documented hack of a disposable camera but then I fed the output to four Microwave oven transformers and used a SCR to fire single shots to an ignition coil
Even from a 1.5AA battery the sparks are very satisfying but at 3,0V they are , to me, remarkable The big problem is keeping control of he High voltage around the neck of the ignition coil - I used two part epoxy putty to try and stop these flash overs but if anyone knows abetter solution I would be grateful of any suggestions.
Registered Member #3925
Joined: Fri Jun 03 2011, 10:50AM
Location:
Posts: 121
hey,
wow that is awesome, i must try that sometime, dyou think it would work as well with a flyback transformer? i have tried this approach to generating big sparks many times, but never had much success, but to get a spark which is probably in excess of 100kv from 3v is very good, as for the insulation im not sure how to do that. i would try gluing a plastic tube round that hv pin, but almost everything i build is held together with twisted wires, hot glue and sticky tape. LOL so maybe it wouldnt be the best method, but it has worked allright for me when using my flyback transformer stuff.
Registered Member #152
Joined: Sun Feb 12 2006, 03:36PM
Location: Czech Rep.
Posts: 3384
Hello, nice project, did you consider using an electrolytic cap instead of the four MW caps? The cap probably won't be larger than half of an AA battery.
It is also possible to make a self-triggering circuit using two resistors, capacitor and a DIAC.
Registered Member #579
Joined: Mon Mar 12 2007, 09:45AM
Location: Burntwood, Staffs, England
Posts: 46
Dr. Kilovolt wrote ...
Hello, nice project, did you consider using an electrolytic cap instead of the four MW caps? The cap probably won't be larger than half of an AA battery.
It is also possible to make a self-triggering circuit using two resistors, capacitor and a DIAC.
I had the MO caps but did not have any Electrolytic caps rated at 800v plus! The idea of a Push to make button was I was in control of the firing. A zap of this REALLY REALLY hurts .. Also the problem of containg te sparks, even at an in put of 1.5V AA battery would have been worse if it was firing every time the caps recharged The sparks blew through three layers of NST silicone boots and the atomic size punctures , once made were constantly flashing over
Any ,sub microscopic, gap cused an electrical path
Registered Member #579
Joined: Mon Mar 12 2007, 09:45AM
Location: Burntwood, Staffs, England
Posts: 46
alf wrote ...
hey,
wow that is awesome, i must try that sometime, dyou think it would work as well with a flyback transformer? i have tried this approach to generating big sparks many times, but never had much success, but to get a spark which is probably in excess of 100kv from 3v is very good, as for the insulation im not sure how to do that. i would try gluing a plastic tube round that hv pin, but almost everything i build is held together with twisted wires, hot glue and sticky tape. LOL so maybe it wouldnt be the best method, but it has worked allright for me when using my flyback transformer stuff.
good luck. Alf.
I don't think it would work with a flyback because itis a different principle of operation , it needs High frequency I don't think it would work on a "one shot" operation[youtube]https://4hv.org/e107_images/
generic/bbcode/link2.png[/img]
Registered Member #3781
Joined: Sat Mar 26 2011, 02:25AM
Location:
Posts: 701
For your insulation problem, try finding a plastic sleeve of some sort (electrical cord insulation works best for me). Cut off however much you need, slide it over the part that's causing flash-over and then pump the inside of the sleeve with hot glue. It works really well and it's not messy if you're careful.
Registered Member #3888
Joined: Sun May 15 2011, 09:50PM
Location: Erie, PA
Posts: 649
if you could come up with a higher voltage switch, i'd say feed the camera output through a cw voltage multiplier and charge the caps up even higher :) but that would further worsen your insulating problems. try using some plastic sheeting to do the insulating, while using the epoxy to hold it in place. you could even use a short length of pvc pipe.
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Easy High voltage - 90mm- sparks from only 3Volts
