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Post by lamazoid on May 10, 2008 2:54:03 GMT -8
On your photo the bulb is connected directly to output without bridge. This is wrong. I suspect the bridge is your problem, replace all diodes and test again with it.
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Post by Gary Lecomte on May 10, 2008 5:33:37 GMT -8
Ivan, You need to put a large Heat Sink on your Mosfet.
Without a heatsink they get very hot and burn out. Especially when driving them like that to light a light bulb.
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Post by Deleted on May 10, 2008 9:04:43 GMT -8
Ops..!I did it badly, thank you buddy! Thank you very much GARY, I thought about putting coolers as LAMAZOID said on heLs page but I forget it.Your very attentive as everytime.
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Post by lamazoid on May 10, 2008 9:29:46 GMT -8
Does it work now ?
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Post by Deleted on May 10, 2008 15:27:53 GMT -8
YES!!!! Thanks guys!! But I have a very small sparks 20 mm or less and very thins (4 or 5 sparks in same time like my other circuit) Now I have to make many changes to the circuit. I probe to change the surge arrester by metal cross but the result is the same, I think change the core of T2 and use a rod from a flayback. (maybe work)
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Post by Gary Lecomte on May 10, 2008 19:33:26 GMT -8
Hi Ivan....I can't remember How many turns you have on the primary of T2. I think you said about 35, Maybe try Reducing them to about 20 and see what happens.
Most important is the Battery Input Current and at what voltage? (Output Power = Input Power, Less Efficiency loss of probably 10 to 20%.) Ideally the Battery will Maintain at least 9 volts in operation. But 12 volts is better. This will ensure the Mosfet turn Fully on, giving an efficient output.
The Capacitor Stores the power from T1, than releases it in pulses as controlled by your surge arrester or spark gap. T1 Must be capable of Quickly Restoring the Current and Voltage to that cap after each discharge pulse. The Higher the Capacitance of that cap, the Greater the discharge into T2 and the Greater the Current out. But than T1 Must be able to Re-Energize the capacitor much quicker. This also means the Battery Must deliver more current
Since I don't know what voltage or current you have coming out of T1, its really hard to help you. The Light Bulb picture shows a Reasonable Power out of T1. But that bulb is a LOW Impedance load. Its not the same situation as charging up the cap.
A good Ferrite material on T2 Helps to transfer the Magnetic Field, but without the Previous info Above, You still won't get a good output.
Hope this helps you to understand better......Gary ** And my ferrite offer still stands
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Post by lamazoid on May 10, 2008 23:41:59 GMT -8
YES!!!! Thanks guys!! But I have a very small sparks 20 mm or less and very thins (4 or 5 sparks in same time like my other circuit) There is a BIG difference between reqular sparks (one cap and T2) and my design. You should notice it, no matter what voltage on surge arrester or how long your spark is. Otherwise (if you don't see any difference) you did something wrong. Frequently seen problem is fried diodes on second cap. You should test them too. Or wrong phased T2.
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Post by Deleted on May 11, 2008 10:46:15 GMT -8
Thanks guys!! I use a transformer 12V 5A, my T1 is bigger than suggested (25 mm) with wire thickest, 0.22 mm diameter. the capacitors loaded well, short-circuiting with screwdriver and produce large outbreak (sound strong), I use cross spark gap but does not work better. The problem must be (I think) the T2 or T1 with a few laps. The same coil (t2) in my another circuit produces sparks of 60 mm. The bulb test was one small of 220v 40W, so as not to damage the bulb MOSFET use a 25W car bulb in series with the positive transformer. The oscillator only works when the polarity invested in MOSFET Reverse Sort of drawing circuit
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Post by Gary Lecomte on May 11, 2008 13:52:46 GMT -8
so as not to damage the bulb MOSFET use a 25W car bulb in series with the positive transformer. The oscillator only works when the polarity invested in MOSFET Reverse Sort of drawing circuit If you have a 25 watt car bulb in the 12 volt wire, that will LIMIT Current TOO Much for the circuit to work properly and give a good spark. And with Proper Heat Sinks, Your Mosfets should be OK. And I Don't understand your second sentence.
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Post by Deleted on May 11, 2008 13:53:03 GMT -8
YES!!!! Thanks guys!! But I have a very small sparks 20 mm or less and very thins (4 or 5 sparks in same time like my other circuit) There is a BIG difference between reqular sparks (one cap and T2) and my design. You should notice it, no matter what voltage on surge arrester or how long your spark is. Otherwise (if you don't see any difference) you did something wrong. Frequently seen problem is fried diodes on second cap. You should test them too. Or wrong phased T2. Yes my friend, I know the differences and that your stun is better than mine, so I'm trying to make.
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Post by Deleted on May 11, 2008 14:00:47 GMT -8
Hi GARY..! my next test is to remove the bulb in series, (in first stage). But I think that did not affect much the circuit since the transformer is 5A. What I said is that my circuit works only if I connect the wires of the transformer invested.
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Post by Deleted on May 11, 2008 14:12:51 GMT -8
One thing more, not use resistors in parallel with the capacitors ( I must to probe this ) I have many things to do and little time, but each new experience going to the post THANKS BUDDYS..!!!
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Post by Deleted on May 11, 2008 14:19:56 GMT -8
so as not to damage the bulb MOSFET use a 25W car bulb in series with the positive transformer. The oscillator only works when the polarity invested in MOSFET Reverse Sort of drawing circuit If you have a 25 watt car bulb in the 12 volt wire, that will LIMIT Current TOO Much for the circuit to work properly and give a good spark. And with Proper Heat Sinks, Your Mosfets should be OK. And I Don't understand your second sentence. 12V * 5A = 60W 60W-25W"bulb" = 35W FREE POWER (the stun gun can work very well with 35w)
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Post by lamazoid on May 11, 2008 22:46:58 GMT -8
No it will not. Because of high resistance of bulb mosfet inverter will not work.
I don't understand about reverse connection, too. This is push-pull so it does not matter how to connect wires, because of circuit symmetry. So it means there's something wrong, again. If your ciruit lights up the bulb WITH rectifier bridge connected it MUST charge the cap and MUST provide the discharge into arrester. Today i will post a photo of "how to" assembly this ciruit, maybe it will help.
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Post by lamazoid on May 11, 2008 22:48:51 GMT -8
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