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Quick electrical question...and a few more

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ninjasquirrel:
Hey guys I want to cool my bartop project with 4 pc fans rated at 12v each-Each pulls 0.1 amps  I have an old wall wart rated at 9v but actually outputs @14 volts when tested with the multi-meter with no load. When I wire tied all the grounds and leads together and checked the voltage, it was reading @7ish volts (i'm pretty sure, need to check again)
I also have the linx LED lighting that groovy gamer gear sells it's rated at 12v also. Can the fans and lights be wired to the wall wart directly and everything be happy? Or does it need to be regulated better? I have VERY little room inside the bartop so I need a very small solution to fit inside it.

question #2
I also have a pc speaker system that i'm using. The power supply on it is a pretty large brick and is rated at 14v output. What are my options to tie this thing into the same system as fans and lights? I don't have room for a pc power supply, so I like the idea of the small wall warts, but even the speaker brick is almost too large!
Thanks

scream1973:
You have to look at the total amperage being drawn.

Typically if you supply less voltage to a device like a fan you will just get slower rotation but everythign will still function properly.. However LEDS can be very particular about what you are feeding them.
Your best bet is to take a 12 volt regulated feed off your pc power supply. Or barring that get a regulated wall wart.

DillonFoulds:
+1 for a PC power supply. If you don't think you can afford the space for a full sized atx power supply, what about scavenging old computers for an mATX supply? Or perhaps find an ultra small form factor (usff) dell computer. They typically have proprietary supplies with a much smaller footprint, but the same standard of color-coding the output wiring.

lilshawn:

--- Quote ---Or barring that get a regulated wall wart.
--- End quote ---

an SMPS power supply can supply 2 or more amps (even over 5 amps is available) and be 1/5th the size of a conventional wall wart of similar output...this one is about 2x2x5 inches...could be tucked out of the way someplace




http://www.ravirajtech.com/smps_power_supply_adapters_india.htm

Donkbaca:
you could get one of these:
http://cgi.ebay.com/MOLEX-SATA-HDD-Bluray-12V-5V-DC-AC-Power-Adapter-9B-/350240383232?pt=PCA_UPS&hash=item518bf42100

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