- If you need clarification, ask it in the comment box above.
- Better answers use proper spelling and grammar.
- Provide details, support with references or personal experience.
Tell us some more! Your answer needs to include more details to help people.You can't post answers that contain an email address.Please enter a valid email address.The email address entered is already associated to an account.Login to postPlease use English characters only.
Tip: The max point reward for answering a question is 15.
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
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.
The polarity is correct, but 400mA is not enough. One commercial supply I saw was rated at 2.5A. I even suspect 3v isn't enough as I have tried an external battery pack with D-Cells in it and after a few flash shots it wants new batteries. The camera itself seems to be over-sensitive to "low" voltage and complains about new or freshly charged batteries (see other posts).
There is a problem with these cameras in this battery voltage area. I have asked Vivitar what external voltage to use, but no reply. Good luck! I am sufficiently fed up with this camera that I may try 4.5v external supply and if it blows up, good riddance!
If you are thinking of runnig it from the mains supply then you will need a 3v units - a common universal unit from will do it
the camera will have a diode thats protects the polarity and a universal power supply with have reversible connectors