Trouble with Shocker - Electronic Circuits Projects Diagrams Free

Cry_Wolf · 13th January 2008, 03:59 PM

I decided to build a shocker that operates at 6V. I build the following circuit. It worked fine and when i powered it it gave me humming sound which means that the relay was switching on and off at very high frequency.

But the problem is when i connected a small mini transformer(Which i got from a my cheap old charger) across point A and B it did'nt worked.

What could be the problem. I know the problem is with the transformer, Can any one tell me which transformer to use??

**Nigel Goodwin** · 13th January 2008, 04:38 PM

That's because you connected the transformer in completely the wrong place - look at your circuit and think about it!.

Cry_Wolf · 13th January 2008, 05:43 PM

I took this as reference:

http://www.electro-tech-online.com/a...f?d=1102621425

Cry_Wolf · 13th January 2008, 05:45 PM

Well if you say that polarities are wrong in my diagram, then again my circuit is not working because i tried by both the ways

JTECH · 13th January 2008, 05:59 PM

Did you verify that the transformer you used is only a transformer and does not contain any rectifiers? You don't want a rectifier to shunt your generated high voltage, so it must be a true transformer with the low voltage secondary connected across the coil of the relay to give you the required step-up. (Important also is that the impedance of the transformer winding should be approximately equal to the impedance of the relay coil, otherwise the current will have a preference for which ever one has the lower impedance). (Output is on the high voltage side).

Try to find an open type relay and wind a few thousand turns of very thin wire on top of the existing coil if space allows it. This winding can then be used as the high voltage output. (Just a thought!).

**Nigel Goodwin** · 13th January 2008, 06:27 PM

Quote:

Originally Posted by Cry_Wolf

Well if you say that polarities are wrong in my diagram, then again my circuit is not working because i tried by both the ways

I didn't say the polarity was wrong, I said you've connected the transformer to completely the wrong place - and it's nothing like the link you posted.

I'll give you an extra clue (although there's almost no components to get confused by) - you've connected your transformer directly across the battery!.

Cry_Wolf · 13th January 2008, 06:45 PM

Ok I got it, actually i drew the schematic wrong in hurry. So here's the schematic of the circuit which actually i made.

**Nigel Goodwin** · 13th January 2008, 06:50 PM

That should work then, although personally I'd probably connect point B to the other relay contact, so it 'makes' as the relay switches.

There's really nothing to go wrong, unless you wire it wrong.

Cry_Wolf · 13th January 2008, 06:54 PM

Ok can you tell me which transformer to use. I actually broke a old nokia charger to get a transformer if you can specify one it would be helpful.

**Nigel Goodwin** · 13th January 2008, 06:57 PM

Was the Nokia a switch-mode transformer?, I wouldn't expect that to work very well.

Hero999 · 13th January 2008, 08:06 PM

Quote:

Originally Posted by Nigel Goodwin

There's really nothing to go wrong, unless you wire it wrong.

The relay will expire pretty quickly as they're not designed to work at that frequency.

Cry_Wolf · 13th January 2008, 08:43 PM

any alternative to relay??

Actually i am having a party soon in my university

so i am in urgent of a shocker

. Any help would be appreciated.

**Nigel Goodwin** · 13th January 2008, 09:26 PM

Quote:

Originally Posted by Hero999

The relay will expire pretty quickly as they're not designed to work at that frequency.

It's not like you're wanting it to run for days at a time, it should certainly last much longer than it takes to get bored with it - and has the added advantage that it will stop working well before the hospital get around to removing it from where it gets shoved!

blueroomelectronics · 13th January 2008, 10:53 PM

I guess when there's no beer; a shocker is good fun at a college party.

Papabravo · 14th January 2008, 01:05 AM

Yup. "Beer is proof that God loves us and wants us to be happy"
B. Franklin

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13th January 2008, 04:38 PM	(permalink)
Nigel Goodwin	That's because you connected the transformer in completely the wrong place - look at your circuit and think about it!. __________________ PIC programmer software, and PIC Tutorials at: http://www.winpicprog.co.uk

13th January 2008, 05:43 PM	(permalink)
Cry_Wolf	I took this as reference: http://www.electro-tech-online.com/a...f?d=1102621425 __________________ Khizer Naeem Mughal IIUI

13th January 2008, 05:45 PM	(permalink)
Cry_Wolf	Well if you say that polarities are wrong in my diagram, then again my circuit is not working because i tried by both the ways __________________ Khizer Naeem Mughal IIUI

13th January 2008, 05:59 PM	(permalink)
JTECH	Shocker Did you verify that the transformer you used is only a transformer and does not contain any rectifiers? You don't want a rectifier to shunt your generated high voltage, so it must be a true transformer with the low voltage secondary connected across the coil of the relay to give you the required step-up. (Important also is that the impedance of the transformer winding should be approximately equal to the impedance of the relay coil, otherwise the current will have a preference for which ever one has the lower impedance). (Output is on the high voltage side). Try to find an open type relay and wind a few thousand turns of very thin wire on top of the existing coil if space allows it. This winding can then be used as the high voltage output. (Just a thought!). Last edited by JTECH; 14th January 2008 at 11:15 AM. Reason: Additional thoughts

13th January 2008, 06:50 PM	(permalink)
Nigel Goodwin	That should work then, although personally I'd probably connect point B to the other relay contact, so it 'makes' as the relay switches. There's really nothing to go wrong, unless you wire it wrong. __________________ PIC programmer software, and PIC Tutorials at: http://www.winpicprog.co.uk

13th January 2008, 06:54 PM	(permalink)
Cry_Wolf	Ok can you tell me which transformer to use. I actually broke a old nokia charger to get a transformer if you can specify one it would be helpful. __________________ Khizer Naeem Mughal IIUI

13th January 2008, 06:57 PM	(permalink)
Nigel Goodwin	Was the Nokia a switch-mode transformer?, I wouldn't expect that to work very well. __________________ PIC programmer software, and PIC Tutorials at: http://www.winpicprog.co.uk

13th January 2008, 08:43 PM	(permalink)
Cry_Wolf	any alternative to relay?? Actually i am having a party soon in my university so i am in urgent of a shocker . Any help would be appreciated. __________________ Khizer Naeem Mughal IIUI

13th January 2008, 10:53 PM	(permalink)
blueroomelectronics	I guess when there's no beer; a shocker is good fun at a college party. __________________ Bill Smart Kits build Smart People http://www.blueroomelectronics.com Last edited by blueroomelectronics; 14th January 2008 at 12:40 AM.

14th January 2008, 01:05 AM	(permalink)
Papabravo	Yup. "Beer is proof that God loves us and wants us to be happy" B. Franklin __________________ We never have time to do it right; but we always have time to do it over.