Intermediate Stun Gun - Page 15 - Electronic Circuits Projects Diagrams Free

Hero999 · 18th June 2007, 08:32 PM

It's a transformer.

It increases the voltage by the turns ratio.

It doesn't make energy from nothing, the voltage is increased so the current is reduced, remember VI = Power.

Normally the ouput voltage is even higher than you'd expect be cause the current is suddenly interrupted in the primary causing a high voltage which is multiplied again by the secondary.

Look up transformers and ignition coils on Wikipedia.

You could also ask your physics theacher he/she will probably be able to offer you an excellant explanation.

HarveyH42 · 19th June 2007, 12:10 AM

I can't believe how long this thread has been going. Must be the longest active thread here.

I would think the purchase price of a manufacture device would well worth the money if you shock somebody and they die. Always blame the manufacturer, some measure of legal protection. Kill somebody with a home built unit, and its manslaughter, and a judge will decide how justified you were to use deadly force.

To have any chance of being effective, you would need to practice and train yourself to use it effectively in a real situation. I'd think that time would be better spend learning a more effective means of self-defense. I mean, what are you going to do if the batteries are dead? What if you fumble and drop it? Gets knocked out of your hand? Bummer if it gets turned back on you... I just wouldn't want to put much reliance on a single defense. Got to be ready to do what you can with whatever is available...

Hero999 · 19th June 2007, 08:03 AM

I agree, take up a martial art, perhaps Nigel can advise you.

things · 19th June 2007, 09:16 AM

hmmm, i have noticed that too. why do so many people want to build a stun gun?, even though it's not likely to kill you, not many people appreciate being shocked no matter how many volts/milliamps it is. And in most places i'd imagine that they would be illegal?

Hero999 · 19th June 2007, 09:46 AM

They're illegal over here in the UK.

usmankhan · 19th June 2007, 10:04 AM

yes i use breadboard to built this circuit and it is the easiest way to built circuit

things · 19th June 2007, 10:05 AM

Is there any country that they are not illegal?

Hero999 · 19th June 2007, 01:48 PM

Yes, please read my previous response.

**Nigel Goodwin** · 19th June 2007, 01:57 PM

Quote:

Originally Posted by Hero999

Yes, please read my previous response.

I suggest you read the post you replied to again!

Hero999 · 19th June 2007, 02:02 PM

I don't see how a home made stun gun will be more illegal than a ready made one providing it doesn't kill any one.

I do agree that if it's off the self then you can blame the manufacturer which won't be the case if you've built it yourself.

Also stun guns are illegal in many countries anyway.

bananasiong · 24th June 2007, 08:25 AM

I wonder the TIP31 will not be destroyed by the back emf?

audioguru · 24th June 2007, 01:35 PM

Quote:

Originally Posted by bananasiong

I wonder the TIP31 will not be destroyed by the back emf?

Yes, probably.
If the stun gun doesn't have a victim as its load then the back emf will increase until something conducts. It the output sparks then the back emf will be limited. If there is no spark then you can say goodbye to the TIP31 transistor.

bananasiong · 24th June 2007, 02:56 PM

Can't just use a diode to protect it? Or this will reduce the stepped up voltage?

audioguru · 24th June 2007, 03:03 PM

Quote:

Originally Posted by bananasiong

Can't just use a diode to protect it? Or this will reduce the stepped up voltage?

A protection diode would reduce the stepped up voltage.
A real stun gun uses a high voltage Mosfet to drive the transformer.
It also uses a transformer designed for high voltages, not just a dinky little audio transformer.

bananasiong · 24th June 2007, 03:17 PM

Just to confirm. If no diode for protection, the stepped up voltage is higher than the step up ratio because the back EMF is also stepped up. When a diode is added, the stepped up voltage is the product of the ratio and the input voltage of the transformer, right?

Quote:

A real stun gun uses a high voltage Mosfet to drive the transformer.

The high voltage MOSFET you meant is the one that can handle the fly back?

*sorry for the nobbie questions, I'm not good in ac.

18th June 2007, 08:32 PM	(permalink)
Hero999 Experienced Member	It's a transformer. It increases the voltage by the turns ratio. It doesn't make energy from nothing, the voltage is increased so the current is reduced, remember VI = Power. Normally the ouput voltage is even higher than you'd expect be cause the current is suddenly interrupted in the primary causing a high voltage which is multiplied again by the secondary. Look up transformers and ignition coils on Wikipedia. You could also ask your physics theacher he/she will probably be able to offer you an excellant explanation. __________________ What's so bad about Microsoft? Get Opera it's simply a superb browser.

19th June 2007, 08:03 AM	(permalink)
Hero999 Experienced Member	I agree, take up a martial art, perhaps Nigel can advise you. __________________ What's so bad about Microsoft? Get Opera it's simply a superb browser.

19th June 2007, 09:16 AM	(permalink)
things Experienced Member	hmmm, i have noticed that too. why do so many people want to build a stun gun?, even though it's not likely to kill you, not many people appreciate being shocked no matter how many volts/milliamps it is. And in most places i'd imagine that they would be illegal? __________________ The 3 laws of science.... 1. If it smells bad, It's chemistry. 2. If it's mushy, It's biology. 3. If it doesn't work, It's physics. www.laserpointerforums.com A forum for disscusion of lasers and laser shows! www.laserchat.org IRC chat for laser and electronic related stuff.

19th June 2007, 09:46 AM	(permalink)
Hero999 Experienced Member	They're illegal over here in the UK. __________________ What's so bad about Microsoft? Get Opera it's simply a superb browser.

19th June 2007, 10:05 AM	(permalink)
things Experienced Member	Is there any country that they are not illegal? __________________ The 3 laws of science.... 1. If it smells bad, It's chemistry. 2. If it's mushy, It's biology. 3. If it doesn't work, It's physics. www.laserpointerforums.com A forum for disscusion of lasers and laser shows! www.laserchat.org IRC chat for laser and electronic related stuff.

19th June 2007, 12:10 AM	(permalink)
HarveyH42 Experienced Member	I can't believe how long this thread has been going. Must be the longest active thread here. I would think the purchase price of a manufacture device would well worth the money if you shock somebody and they die. Always blame the manufacturer, some measure of legal protection. Kill somebody with a home built unit, and its manslaughter, and a judge will decide how justified you were to use deadly force. To have any chance of being effective, you would need to practice and train yourself to use it effectively in a real situation. I'd think that time would be better spend learning a more effective means of self-defense. I mean, what are you going to do if the batteries are dead? What if you fumble and drop it? Gets knocked out of your hand? Bummer if it gets turned back on you... I just wouldn't want to put much reliance on a single defense. Got to be ready to do what you can with whatever is available...

19th June 2007, 10:04 AM	(permalink)
usmankhan New Member	yes i use breadboard to built this circuit and it is the easiest way to built circuit

19th June 2007, 01:48 PM	(permalink)
Hero999 Experienced Member	Yes, please read my previous response. __________________ What's so bad about Microsoft? Get Opera it's simply a superb browser.

19th June 2007, 02:02 PM	(permalink)
Hero999 Experienced Member	I don't see how a home made stun gun will be more illegal than a ready made one providing it doesn't kill any one. I do agree that if it's off the self then you can blame the manufacturer which won't be the case if you've built it yourself. Also stun guns are illegal in many countries anyway. __________________ What's so bad about Microsoft? Get Opera it's simply a superb browser.

24th June 2007, 08:25 AM	(permalink)
bananasiong Experienced Member	I wonder the TIP31 will not be destroyed by the back emf? __________________ Superman Returns.. http://www.supermanhomepage.com/imag...an-returns.gif My friend created this account for me.. LOL http://bananasiong.myminicity.com oh.. somemore http://bananasiong.myminicity.com/env

24th June 2007, 02:56 PM	(permalink)
bananasiong Experienced Member	Can't just use a diode to protect it? Or this will reduce the stepped up voltage? __________________ Superman Returns.. http://www.supermanhomepage.com/imag...an-returns.gif My friend created this account for me.. LOL http://bananasiong.myminicity.com oh.. somemore http://bananasiong.myminicity.com/env

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