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Registered Member #617
Joined: Fri Mar 30 2007, 07:29PM
Location: Buffalo NY
Posts: 49
I dont quite understand how those transformers can be fed from two batteries with only a resistor connecting the pins? If you turn them on and off quickly thats one thing, but it seems to me that your not and i have no idea whats going on here.
Registered Member #56
Joined: Thu Feb 09 2006, 05:02AM
Location: Southern Califorina, USA
Posts: 2445
There is also a transistor connected to it. It works but having a feedback winding on the transformer that feeds the transistor causing the circuit to resonate. Quite ingenious little drivers
Registered Member #75
Joined: Thu Feb 09 2006, 09:30AM
Location: Montana, USA
Posts: 711
Slightly off-topic, however my guess on how the "inverter" works is that it's a blocking oscillator like the "Joule thief" here: At least that's the only inverter circuit I know that works with only one transistor and one resistor, and I think a while back there was a thread here by someone who modified the circuit for 400V output - possibly even using a disposable camera transformer.
Registered Member #952
Joined: Mon Aug 13 2007, 11:07AM
Location: Finland
Posts: 388
Yep, it's a blocking oscillator. The camera circuits can be overdriven up to 6 volts so in theory you could get 1.2kV out. The highest voltage I've gotten would be kinda 500V (driven from 3 volts)
Registered Member #1225
Joined: Sat Jan 12 2008, 01:24AM
Location: Beaumont, Texas, USA
Posts: 2253
This is absolutely amazing! I cant get video to work though. The thing that is amazing is that someone could actually get a spark at all with just 4.5 watts. That was a seriously...Well it was ingenious. Now make a tiny rsg( even though it will probably reduce performance).
Registered Member #286
Joined: Mon Mar 06 2006, 04:52AM
Location:
Posts: 399
"This is absolutely amazing! I cant get video to work though. The thing that is amazing is that someone could actually get a spark at all with just 4.5 watts. That was a seriously...Well it was ingenious. Now make a tiny rsg( even though it will probably reduce performance)."
I have made a small RSG coil last year but I did not used a camera flash inverter. An air ionizer inverter was used.
Registered Member #1361
Joined: Thu Feb 28 2008, 10:57AM
Location: Cairns, Australia
Posts: 305
Thats amazing!!! never knew camera transformers could be used for such a thing, and with the relativly low voltage, caps wouldnt cost to much either. Nice work!
Registered Member #75
Joined: Thu Feb 09 2006, 09:30AM
Location: Montana, USA
Posts: 711
Spark, (hey, yet another Fin in the forum!), would you be able to give some more information about the camera transformer? I don't have any disposable cameras so I tried winding my own. I used a tiny 25mm^2 ferrite core with 5+5 windings on the primary and a few 100 windings on the secondary. I could get it to oscillate alright, but even from a 5V supply it took several seconds to charge a 1uF cap up to 300V, and it oscillated at a very high frequency (about 200kHz).
If you have more info on your transformer, I could try to replicate it.
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Small Tesla Coil using disposable camera transformers
