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Polarity of AC Adaptor

Dear Sir:

Some AC Adaptor with inside + pole. other with inside pole Negative.

Please advise me how to determine the polarity of the inside pole.

Thank you very much.

Richard

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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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The power on my banshee is coming on?


Check the polarity of the adapter, if it isn't the original one. Even if you have the right voltage, it still has to have the mA or higher but, most important is the polarity. Most guitar pedals are wired backward on the plug. The positive is on the outside ring of the plug and negative is in the middle. There should be a picture or diagram somewhere on the unit close to the plug to find out. If it is backwards, it could have damaged it, maybe not though. If it is ok, cut the plug off and switch the wires and check it. After all, it's not working now, it couldn't hurt.

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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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You should go to a local electronics shop with the old adaptor.
They merely need to match: Voltage in Voltage out Current requirements Plug size Plug polarity (center positive or negative) There is nothing "magic" about the original vendors power adapter.

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Need the polarity of the adapter for polyview v17e moniter


i'm guessing you don't have the original adaptor to test it... sometimes polarity is printed onto the case where the adaptor plugs in... get out your magnafying glass to see it tho.

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Ac adapter


If I understand your description correctly, you have two TVs that use the same model adapter, and both adapters have failed. In that case, I would suspect a weak design, or you may have put them in some place where they were overheated or zapped by power line surges. If it appears to be a design problem, you may want to consider using a substitute.

The adapter should have the output voltage and current marked on it, for example, 12VDC 2300mA would be a 12 Volt, 2.3 Amp output. The polarity is usually marked with a diagram showing whether the center in or hole in the plug is positive or negative.

You can use an adapter with the same voltage and plug style (including polarity) and the same or greater current output. If you find one with the right voltage and current, but the wrong plug, you may be able to change the plug. Just be absolutely certain you have the wires going to the correct terminals; reversing the polarity could damage or destroy your TV. Do a proper solder job on it; simply stripping the wires and twisting them on will not be reliable.

Sources for adapters include www.jameco.com and www.mouser.com.

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I can't determine the polarity of my GPX PDL705 portable dvd


Hi,

I have uploaded the GPX PDL705 manual to this site today. If you check tomorrow they may have posted it by then.

If you look at the small print on the adaptor it should indicate by diagram Voltage output, current capacity, type and tip polarity by small diagram. Most adaptors are 'positive' -- but if you are unsure do not plug the adaptor into the device because it will fry it!

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oh no maybe you used different adaptor some adaptor have reverse polarity. check the adaptor before plugging it..if you using variable voltage set to 3v then adjust also the polarity. the polarity should match the polarity of your camera.

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