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What is the DC polarity of the ca-ps800 AC/DV adapter ?

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  • FOTO SPECIALISTAS Feb 11, 2012

    I have a CANON A420 camera and i must connect and supply it with an external 3V power supplyer (i made it myself) but i dont know where is the + and the - point on the input socket of the camera, to avoid damage. The original power adapter for this camera is the CA-PS800. So if you know the polarity of the DC jack of CA-PS800 , please tell it to me. Thanks...

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Posted on Jan 02, 2017

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SOURCE: My Casio WK-3800 will ONLY work on batteries not

Your adapter should be an AD12M. Some have tried a switching version of this and it has not worked. Make sure yours is the AD12M and not the "ML" suffix one.
The reason is that some of these have filtering built into the adapter, and others do not. The filtering is often required.

Posted on Oct 30, 2010

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Adapter polarity


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..20023597-2ss5ycyvkoajtv035dpuezke-5-0.jpg
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20023597-2ss5ycyvkoajtv035dpuezke-5-3.jpg



20023597-2ss5ycyvkoajtv035dpuezke-5-6.jpg

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DO NOT use universal adapters to run these devices. Accidents are too easy and often the universal devices do no have adequate filtering. You are off on the wrong foot to start with as this unit does NOT have a polarity since it REQUIRES an AC adpter, not a DC one. What you have WILL NOT WORK. If you have connected it, it should NOT have caused damage, you just won't get any audio out, even if the unit lights up on one polarity. The unit generates both polarities inside using the AC input.

Here is an example of correct adapter: http://lcdpayless.com/productpage.php?productId=5793

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AC output adapters are harder to find.

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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.
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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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Check the adapter is the right voltage AND polarity for the Casio... I believe they usually take a 9 volt DC adapter with the center pin being MINUS polarity.

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