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Positive negative polarity - Black & Decker Drills

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Posted on Jan 02, 2017

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davidalfredw
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SOURCE: what is the polarity of a 12v Black & Decker Drill?

centre pin on plug socket is usually positive...
think I would **** it and see ....if the replacement charger has a charge light it will probably not light if you have reversed polarity. Had the same problem with VHF portables ...I just cut the wire on new charger and tried both options ..reconnected and a bit of tape...voila.
There is little danger to your drill from getting it wrong as long as a the timing is relatively short.

Posted on May 29, 2012

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2 Answers

I need to know the POLARITY of the AC adaptor to provide the correct setting using a universal adapter.


there is no polarity in ac current as ac means alternating current and that means alternating between positive to negative back to positive back to negative and so on
only dc ( direct current ) and the center pin of the plug is designated as the positive pole has polarity, the outer case being the negative
OR Are you asking the voltage of the ac adapter and the voltage of the dc output side of the adapter

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What polarity is the pentax L30's dc jack?


please mention some more details about the problem.to make it clear and explainable.
reply.

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How can i determine positive and negative polarity of the rear decklid speakers in a 2003 lincoln ls


Hi Joseph, usually most speaker terminals have one terminal smaller than the other, the smaller terminal is most often the negative terminal.
If they are sized the same the following link may help by doing the battery check for polarity.
How to Polarity Klipsch

Trust this helps, regards Alan

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Wiring a DVC 10 inch sub to 2ohms


RED IS USUALLY POSITIVE
RED-WHITE IS MORE THAN LIKELY NEGATIVE
TO CHECK SPEAKER POLARITY:
1. HOOK LEADS UP AS I DESCRIBED
2.TAKE A AAA,AA,C,OR D BATTERY
3.CONNECT POSITIVE SIDE TO POS ON BATTERY...NEGATIVE TO NEG END......
4. IF SPEAKER "CONE" PUFFS OUTWARD..POLARITY IS CORRECT. IF IT PULLS INWARD..POLARITY IS REVERSED

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What voltage and polarity do the ACS-5 speakers require?


Computers always use DC voltage. Computer speakers receive DC voltage from the computer.
DC voltage has a Positive and Negative polarity.

In the power jack of the speaker, the Center pin is the Positive connection. The outer shell is the Negative connection.

Center hole of the DC adapter plug - Positive.
Outer shell of the DC adapter plug - Negative

Voltage 5 Volts DC.

In case you need it,

http://support.dell.com/support/edocs/dta/acs5/

Nov 29, 2010 | Computers & Internet

1 Answer

I have a Casiotone MT70 made in 1984. How do I check the polarity as I need to get an AC Adaptor and don't want to damage the keyboard?


Here is how you might check the polarity of a 7.5 volt DC replacement adapter:

Put the 5 batteries into the unit and verify operation. NOW using a DC voltmeter measure the voltage from battery negative and meter negative connected and meter positive to the pin on the power jack. IF you see 7.5 volts positive, then the pin is the positive lead for the adapter.

If you see zero, then continue testing.

With the 5 batteries inserted, connect the positive meter lead to the positive of the stack of batteries. Now touch the negative meter lead to the pin.
If there is 7.5 volts there, then the pin is the negative lead for the adapter.

READ THESE INSTRUCTIONS CAREFULLY.

USUALLY the jack has a contact that disconnects the batteery when the plug with sleeve is inserted.. We are testing the jack without inserting a plug here so the plug should HAVE THE BATTERY VOLTAGE with correct polarity on the pin.

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1 Answer

Subs positive negative polarity help


if its color coded,,red is positive and black negative,,,if not hook one up and watch the speaker while playin music,,, if its moving in and out its correct,,if not wrong

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2 Answers

I need to know the polarity of my Hp Pavilion F1703 monitor as I have just brought a new power adaptor and before I connect up to the mains it says make sure you insert the adaptor the correct way round...


If the monitor does not have a symbol (similar to the letter 'C' with a dot in the middle), the cheapest digital multimeter can be used on the 'diode' or 'continuity' setting to check the input.
If the meter reads between 600 and 900, you are measuring the forward voltage drop of a protective diode.  Any other reading will mean that the positive probe of the meter is on the positive part of the connector.     i.e. If you are placing the positive meter lead on the center pin and the negative on the shell and it reads 600-900, then the power supply needs to have the negative applied to the center pin and the positive on the shell. If the negative lead is held on the center pin and the positive on the shell and the reading is 600-900 then the center pin is the positive input and the shell the negative.
The readings shown above mean that you are measuring the forward voltage drop of a diode meant to protect the unit against improper polarization and it will probably either die or ruin the adaptor if misapplying the polarity.
You can buy such a meter at electronics or auto parts stores for under $20 US.

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1 Answer

LCW-0120 Labtec speaker polarity


I am assuming that you already know which wires go to which speaker and all you need to know is which one is negative and which one is positive. Here is one way to find out. If you can access the speakers at all or at least see the cones, it will be easy.
Take a small 1.5v battery and connect it to the wires in question, connect one end to the positive(+) and the other to the negative (-) side of the battery, don't do it for a long time, just enough to observe movement on the speaker cones. Observe the cones of the speakers, if the cones get pushed or moves out, take note of the polarity of the battery because now you know which is which. Now if the cones, move inward or it gets sucked in when you apply voltage, then it's backwards.

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1 Answer

Ac adapter 3.0 V polarity


Center pin is positive, and um Zap! Cheers!

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