Help with a circuit...

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# 1 17-01-2004 , 04:08 PM

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Join Date: May 2002

Location: Faringdon, UK

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I have a circuit including a 12V cell, a step up transformer (9v up to 100V) and a light bulb (ive attached a simpliied version of this with this post)

i dont know much about electronics, so its only a simple question, but would it be better to attach a switch to point A in the circuit (on the neutral line) or point B (the one with 12V running through it)?

Which one is it usually attached to? Im looking for the safest option seeing as there's in effect 100V running through the circuit and the wires are slightly exposed

thanks in advance

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- Simon

My Website: www.Glass-Prison.com

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# 2 17-01-2004 , 04:14 PM

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point B. Always interup the current going to the device dont interupt the neutral from the device. reason behind that is the device must have a safe state and that cannont be done with current constantly to the device.

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# 3 17-01-2004 , 07:06 PM

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iron_tick is correct about the placement of the switch. Just out of curiosity, what are ya makin'?

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# 4 18-01-2004 , 01:29 AM

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thanks for that, ill stick it on the red

erm im making a clock with a light inside it user added image

ill show u a pic when its done

- Simon

My Website: www.Glass-Prison.com

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# 5 18-01-2004 , 04:20 AM

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So it sounded like you're running a 100+V DC light??? What's that about???

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# 6 18-01-2004 , 04:44 AM

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lol yeah thats true, i had to take it from my computer cos it was one of those neon string light thingys user added image

- Simon

My Website: www.Glass-Prison.com

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# 7 18-01-2004 , 04:59 AM

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I've never used on of those lights before, but isn't it going to be pulling a lot of current at the 12V cell?

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# 8 18-01-2004 , 05:25 AM

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erm, never thought of that user added image

its only a 9v cell anyway, but if its runs off of 12V inside the computer, i dont see why it wud be a problem outside of the computer, just a diff type of power supply

this is the stringy lighty i have:
https://www.optxbystreetglow.com/elneonstring.htm

- Simon

My Website: www.Glass-Prison.com

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