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Can anyone tell me if the 12 volt powersupply is 12 volt AC or DC ?

Lost my power supply when I moved and cant find another. Need to know if it is 12 v DC or 12 V AC

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  • Roberta Smith
    Roberta Smith May 11, 2010

    likely dc.... do you still have the manual ? i've looked around for the adaptor on the internet and the specs just don't seem to be available.



    Robert

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Model HER-48-12010
P/N: 68300021-0013
AC Input
DC Output

Posted on Nov 04, 2008

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Fault finding


Power is going to the motherboard, and you know this by assuming?

An assumption would be you see the Power Supply fan spin, LED lights light up, and maybe computer case fans spin.

Not an assumption, and you would have tested the 3 main voltage power rails, coming out of the Power Supply.

The Power Supply in your computer is an SMPS.
Switched-Mode Power Supply. (Also is known as the short abbreviation - PSU. Power Supply Unit)

http://en.wikipedia.org/wiki/Switched-mode_power_supply

The Power Supply in your computer is a Converter.
It converts HIGH AC voltage into 3 LOW DC voltages.

[Depending on country,
USA = 120 Volts AC. UK = 240 Volts AC. Japan is 100 Volts AC, but may depend on area. Australia = 240 Volts AC. India = 240 Volts AC. HOWEVER, do not write the above in stone. I may have made an error ]

The 3 low main DC Voltages coming out of the Power Supply is;
A) 3.3 Volts DC
B) 5 Volts DC
C) 12 Volts DC

Orange wires carry 3.3 Volts DC
Red wires carry 5 Volts DC
Yellow wires carry 12 Volts DC
ALL Black wires are Ground wires. They can also be called Negative wires.
This is a DC circuit now. There is a Positive, and a Negative.
Orange, Red, and Yellow wires are power wires, and also Positive wires.

The first part of your diagnosis will be to test those 3 main voltage power rails.

[Digressing;
Using an example;
There are many Red wires coming out of the Power Supply.
These are 5 Volt wires. They are Connected TO, the 5 Volt power rail in the Power Supply.
ALL 5 Volt wires end in one place, in the Power Supply.
The 5 Volt power rail.
When you test just ONE red wire, you are testing the entire 5 Volt power rail coming from the Power Supply.

This also goes for the Orange wires, and Yellow wires ]

With the Red 5 Volt wires, and Yellow 12 Volt wires, you could just use a 4-pin Peripheral power cable to check them,

http://www.playtool.com/pages/psuconnectors/connectors.html#peripheral

Multimeter set to DC Voltage, the red (Positive) probe lead of the multimeter; touches the female metal terminal connector, for the Red wire.

http://www.mcmelectronics.com/product/28-9420&utm_medium=Affiliate&ref=cj&utm_campaign=CommissionJunction&utm_source=CommissionJunction?t=2&utm_expid=8634549-14

The black (Negative) probe lead of the multimeter, touches a female metal terminal connector, that goes to a Black wire.

You should be reading 5 Volts DC.

Same thing for the Yellow 12 Volt wire.

With an Orange 3.3 Volt wire, this changes.
A straightened out paperclip is inserted, down into the BACK of the ATX main power cable's connector; AND into a socket hole with an Orange wire in it.

http://www.playtool.com/pages/psuconnectors/connectors.html#atxmain20

http://www.playtool.com/pages/psuconnectors/connectors.html#atxmain24

The straightened out paperclip, slides down into the socket hole, with the Orange wire in it.
Slides down into the socket hole, RIGHT NEXT TO the orange insulation of the wire, and MUST go down far enough; to Touch that female metal terminal connector.

EVERY wire going down into the ATX main power cable's connector, ends in a female metal terminal connector.

Same thing is down with a socket hole that has a Black wire in it.
ALL Black wires are Ground wires. (Negative)
You can choose ANY socket hole that has a Black wire in it.

Now touch the two probe leads of the multimeter, to their respective straightened out paperclips.

Red (Positive) probe lead of multimeter, to straightened out paperclip in Orange wire socket hole.
Black (Negative) probe lead of multimeter, to straightened out paperclip in Back wire socket hole.

You should be reading 3.3 Volts DC.

(Or if your multimeter kit has special probe lead, that would take the place of a straightened out paperclip, of course use it instead)

Know this;
A) If ALL of the LED's ('lights') were on at once, they would use less than 1 Watt of power.

B) EACH fan uses 2 to 3 Watts of power.

C) A typical CPU (Processor) can use 51 to 130 Watts of power.
Just depends on what Processor (CPU) it is.

This is why a Power Supply with a weak voltage power rail, will not have enough power to turn the Processor ON, but will have enough power to light those simpy LED's, and spin fans.

[LED - Light Emitting Diode ]

Regards,
joecoolvette

May 11, 2013 | Dell Computers & Internet

2 Answers

Wht kind of current comes out?


The computer's switch mode power supply produces DC (direct current) electricity.

Nov 05, 2012 | Computers & Internet

3 Answers

I'm dumb. Can I hook an inverater to my generator and produce more enegry than my generator produces???


Please understand that the generator produces power from fuel with an engine wheras the invertor is one which genrerates power from a stored battery using the principle of frequency switching a DC source to induct and produce AC.
Now you can have an uninterupted power supply setting with the invertor backed up by the generator so that when the battery voltage goes down you can start and charge the invertor and also supply the extra energy .
the ratings of both must also be considered.

Sep 25, 2010 | Electronics - Others

1 Answer

In moving I accidentally seem to have lost my power supply. The router shows 12 volts stamped into the back of it, but can anyone tell me the amperage and polarity on the router side? I found an extra...


If t says 12 volt then that is correct.

They are usually 0.75 A (750mA) for these modems

So long as you match those two numbers you will be fine DONT go less on either but you can go higher on the current rating eg you could go to 1.0A

Regards Bob

Oct 09, 2009 | Arris SURFboard SBG900 Wireless Router...

1 Answer

I have an old SPX90 Digial Reverb with a dead powersupply. The part number on the board is VA81400. Is this part number correct? Is the part still available? We tried ordering it from the Yahama dealer,...


Any power supply will do as long as it has the same specs as the dead one, which will be:

Input : x Volts AC
Output: x Volts AC or DC
Watts: x
Amps: in millamps
Polarity: (for power supply with DC output only) Center pin = plus or Center pin = minus

You should be able to find the matching transformer/adapter/power supply at Radio Shack.

More info, let me know.

Charlie

P.S. The power supply you received may be the correct one -- check to see if the specs match the old one.

Aug 29, 2009 | Audio Players & Recorders

1 Answer

What kind of external power supply does the media speaker needs?


Juster-Avia 3D-107 Media speakers.

I wanted to know what kind of external power supply it needed. I open the case and saw 4 diodes which tells me is a bridge rectifier circuit. I also looked at the filter cap and saw ????uF at 28 volts. Therefor, I did the Scientific Wild *** Guess( A.K.A. SWAG METHOD)
12 volts AC out at 1.6 amps or higher.

Apr 28, 2009 | Juster 3D-102 Computer Speakers

1 Answer

Lost power supply


Hi,

If the desktop charger is the version that can accommodate two radios simultaneously similar to the T5000, then the AC wall adapter or the power supply is 9 volts AC.

Hope this be of initial help/idea. Pls post back how things turned up or should you need additional information.

Good luck and kind regards.

Thank you for using FixYa.

May 26, 2008 | Cobra Radio Communications

2 Answers

Microsoft Force Feedback 2 joystick - Lost Power Supply.


Hope this helps.
Part No. 96749 (Maybe Ebay?)
Input: 230V~ 50Hz
0.15A
Output: 12V 1.3A

Apr 28, 2008 | Microsoft SideWinder Force Feedback 2...

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