Dangers and Safety considerations. - Page 2 - Home Theater Forum and Systems - HomeTheaterShack.com

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post #11 of 14 Old 02-12-10, 02:11 AM
 
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Re: Dangers and Safety considerations.

Always, never assume that the voltage inside the hood is gone even after a short time.
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post #12 of 14 Old 05-04-10, 03:25 PM
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Re: Dangers and Safety considerations.

If one has absolutely no training in electrical / electronics work I would highly discourage poking around inside. However, it is not difficult to get some basic instruction so that you can poke around with some level of safety. Take a basic electronics class locally or work through a lab kit at home. The organized class is preferred because you will be introduced to the equipment and you will have an instructor to guide you.

Even seasoned professionals make mistakes - I personally have had many but for example I melted a large screwdriver on 440 volts that was supposed to be turned off (The shop owner turned it off and I didn't check). I took 25 kv on the chin from a color TV transformer. Etc. There are lots of stories out there.

But there are definitely some basics that you should know before you go for it. As an example (and not for opinion on the issue) it would be foolish to own a gun without taking a firearms safety program or having been taught by a pro somewhere. Electricity can also kill.
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post #13 of 14 Old 05-04-10, 03:42 PM
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Re: Dangers and Safety considerations.

Capacitors are used to either smooth out DC voltage, block AC voltage, pass AC voltage, keep noise off the supply voltage, or combine with other components to create a tuned circuit that will block or pass certain frequencies like in a crossover. The most common caps used in standard electronics are so small that even if discharged it would feel like static electricity because they simply don't hold much energy. Even the basic assortment of electrolytic caps.

But a standard power supply in a device can store up a good shock. And TV's have serious high voltage supplies. These all need discharged correctly.

The large caps used in car audio are a different story. Any capacitor bigger than your thumb probably is going to hurt you. That doesn't mean you shouldn't use caution on any size electrolytic capacitor (these are the ones that look like tin cans). The big ones are truly mini batteries and that is what they are used for. In circuit design 1 farad is about a thousand times bigger than anything ever needed. In fact I don't remember even seeing one that size until "recently". They store a lot of power.

Maybe someone could list the power storage of the different sizes of electrolytic capacitors in a table of some sort for the curious. Start at 10 mf and go up to the big boys. Just an idea.
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post #14 of 14 Old 05-04-10, 04:01 PM Thread Starter
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Re: Dangers and Safety considerations.

Capacitors don't store power, they store charge, and capacitance is the meaningful unit. As you stated, 1 farad is much larger than most consumer electronics require and those are mostly used in car audio or industrial applications. Even a much smaller cap can be dangerous, however, and supplies using thousands of microfarads are common.

The bottom line for safety is to determine if there is voltage on a cap when servicing a unit. If there is, discharge it through a resistor until there is not. Assume that there is no safe level of charge.




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