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20 Comments
- inactive, on 10/12/2007, -0/+6MISLEADING wow.
I was thinking of computer power supplies like Ultra XConnect or Silverstones or something like that.
god how disappointing. - Dhalgren, on 10/12/2007, -0/+5"At 6V, you're not going to get 6mA through your highly resistive body."
This may be true, but part of the instructions include plugging the unit into a wall with the transformer exposed. At this point, the primary windings are at 120V. This is potentially dangerous. I would suggest that if you are going to do something like this, make sure that you are plugging the unit into a GFCI protected outlet (such as one in your bathroom) so that if you do electrocute yourself you are less likely to die. - rebz, on 10/12/2007, -3/+8It should be (and probably is in the article) that this is extremely dangerous. Be careful.
- drakey, on 10/12/2007, -1/+5At 6V, you're not going to get 6mA through your highly resistive body.
In any case, I'm not saying throw caution to the wind and start opening crap up that you don't understand, I'm just saying that "extremely dangerous" is somewhat overstated. Opening up your TV is extremely dangerous. Opening up a wall wart is about as dangerous as licking a 9V battery. - inactive, on 10/12/2007, -2/+5Current, not voltage kills. It only takes 6mA of current to stop the brain/heart.
- tech10171968, on 10/12/2007, -0/+3With the type of power supplies this guy is talking about that's not really true; just make sure you unplug it first (of course). BTW, a CRT (Cathode Ray Tube) doesn't have anything to do with a power supply, and you don't have to wait "42 years" to handle one; just use a 1K ohm, 1/4 W shorting probe on the anode cap before you remove it. CRT's can act as capacitors ad will store a good-sized charge even after the set is turned off and unplugged (for example a 27" TV operates at around 28,000 to 30,000 volts from the IHVT).
- nethag, on 10/12/2007, -0/+3"At this point, the primary windings are at 120V."
Or in most European countries: 220 V. Even more of a shocker! - inactive, on 10/12/2007, -0/+2Depends on how long it takes the caps to discharge.
- Mr.Glass, on 10/12/2007, -0/+2i know your suposed to wait a while after using a power supply before you open it up. anyone know how long you need to wait?
- tylerni7, on 10/12/2007, -0/+2I lick 9 volt batteries all the time, I have been shocked my 120vac current at least 3 times, and have been shocked with a 2kv, 12A microwave transformer. I'm probably just lucky, but as long as it is a small power supply and keeps a low amperage (sure 6ma can kill you, but it isn't very likely), it should be fine. After its unplugged, discharging the capacitor with the end of a screwdriver would be helpful.
(Of course I'm not the best person to give advice on electrical safety as you can see...) - sinembarg0, on 10/12/2007, -0/+1fscking up equipment would be like testing it to see if it works, and would have nothin to do with f*cking it up.
- tylerni7, on 10/12/2007, -0/+1A CRT an microwaves and other high power things should have a bleeding resistor to drain the capacitor /fairly/ quickly... if that isn't in place though, then it will store the charge for a long time.
- radu5er, on 10/12/2007, -1/+1While the graphics in this article are good, IMHO if you need an article like this for this kind of repair you are probably best off in buying a new wall wart and toss the old one. But by all means, if you don't really know what you are doing (ie. if you are not a hardware 'geek' ) BE VERY CAREFUL MESSING WITH MAINS OPERATED EQUIPMENT!
- rebz, on 10/12/2007, -3/+3A CRT is about 42 years.
- stuffhappens, on 10/12/2007, -2/+2@drakey
People have died licking 9V batteries - really! - hawk82, on 10/12/2007, -0/+0When I read the title, I thought it meant repairing modular computer power supplies. Should be renamed to dc warts or dc bricks.
- stuffhappens, on 10/12/2007, -0/+0If you KNOW what you are doing AND have the time then it's easy to fix these things and you are also doing your 'green' bit by not throwing a repairable unit away, but the dilemma is whether to spend 30 mins fixing something that can be replaced for about £3 (in the UK), plus the units are often only around 40-60% efficient (lots of energy wasted as heat) so replacing the unit with a small switch mode version (also very cheap now) with 70-80% efficiency will probably pay for itself in a very short period of time.
- tech10171968, on 10/12/2007, -1/+0I think people should do a little more research before screwing with their electronics. I work in an electronics repair shop, and we get a good bit of business from people who just "knew what they were doing" but fscked up their equipment anyway.
- inactive, on 10/12/2007, -7/+2mod down
- drakey, on 10/12/2007, -12/+3Nah, the article deals with wall-wart style power supplies, which do not store high voltages. Even if you somehow screwed it up and shorted it out, the transformer would probably blow before anything got hot enough to be a fire hazard. "Slightly dangerous" would be a fair caution, though.
