Hmm, disapproving..
Hi, I don't want to bring up any moral issues but I feel I should.
I've built a few 'stun-guns' and I still have mixed feelings about the whole issue. For a start some of the design mentioned are not stun-guns. A stun-gun is designed to deliver a high voltage, high current, VERY brief shock. Which, when delivered into the human body causes certain muscles to spasm (the ones close to the bone). This can cause an involuntary movement, loss of balance, and temporary paralysis. Not always pain, a true stungun should not cause any pain.
People probably should remeber how easy this can kill. You shock someone and they fall, hit their head, and thats it. Or their arms fly up, wack you in the face, and break your nose :lol:
The difficult part in designing such a device is how to make it NON-LETHAL. Any idiot can built something that can kill, but making sure the device can never kill, directly by electrical power (not the secondary effects, muscle spasms, falling) is terribly hard.
Cattle Prods however, are designed for pain and incentive.
Most deisgns on the net seem just to create an unrefined, dirty, high votage (and sometimes high current) spike. Which can vary in power, making it dangerous, and quite frankly pathetically amateurish.
The ones I've seen on the net that claim to be stunguns are:
1) The camera flash circuit:
This can quite easily kill. Cameras usually deliver 300-350v from a large capacitor, which, depending on the discharge time, can deliver a few hundred amps. It can burn, make the person jump, and theoretically at least, kill.
2)The 'ol audio transformer with a voltage mulitplier:
These are pretty unimpressive as far as sparks go, but I've shocked myself with one at 5000v. It hurts, really hurts. My version delivered about 6ma (milliamps). Not much, but at 5000v, it can put more than enough current in your heart to stop it.
3) Refined capacitor discharge:
By far the most efficient design for its intended purpose. The is an actual stun-gun operation. Charge a 400v cap (1-4uF) then discharge it through a step-up tranformer to about 25-100kV. Short shock time, so it doesn't burn, and its average power it pretty small (25kW pulse for 50ns, every 0.1s).
I suggest that anyone wanting to build an actual STUNGUN should do their research into the relative voltage and current values the human body can take. I've known many people who say 'its the volts that jolt and the amps that kill' - People who say this know very little about Electricity.
Need I remind anyone about V=IR. where R is the resistance of the body, which we assume is fixed. At 12V, very little current can flow into the human body (uA??). Jack this up to kV and the limit of current flow is down to the power supply. If you build something that CAN deliver 50mA, at 3000V and decide to test it on a friend, buy a black suit :wink:
I'm sorry for nagging, but, why do you want a stungun anyway?
I've seen so many people requesting stungun designs and then not know exactly what they're doing, most of them were under 16, and one even wanted one for his teacher.
I understand the technical interest in the subject, but who really needs a stungun?
I'm done.
Blueteeth.