Block Transformer polarity

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  #1  
Old 03-08-07, 10:03 AM
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Block Transformer polarity

Hi All,

I have a 5V. block type transformer hardwired into a charger for a tool. The transformer is bad and I need to replace it. However, since the transformer no longer works, I cannot determine the polarity of the two wires. One is solid black and the other has a stripe running through it.

Can anyone help me to determine if the solid is + or -. There must be a convention for wiring transformers.

Thanks!

Len
 
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  #2  
Old 03-08-07, 10:06 AM
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Generally speaking, the striped wire is the ground or neutral, depending on whether the transformer is DC or AC.
 
  #3  
Old 03-08-07, 10:12 AM
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5V transformer polarity

Thanks, Bob.

The transformer plugs into AC and outputs 5v DC to the tool charger.
So, from your reply, I am assuming the solid wire is +.

Is my assumption correct?

Thank you for taking the time to address my problem.

Len
 
  #4  
Old 03-08-07, 10:15 AM
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Open up the charger and look which wire was connected to the positive battery terminal. That would be the positive wire.
 
  #5  
Old 03-08-07, 12:28 PM
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5V. Brick transformer AC to DC

Thanks, again, Bob for your response.

I'll check that tomorrow and let the forum know the results.

Len
 
  #6  
Old 03-10-07, 01:58 AM
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Originally Posted by racraft View Post
Generally speaking, the striped wire is the ground or neutral, depending on whether the transformer is DC or AC.
A DC transformer? Are you serious?
 
  #7  
Old 03-10-07, 07:12 AM
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He is refering to one of those things I call wall warts. They come in DC or AC output.
 
  #8  
Old 03-13-07, 09:47 AM
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Typically the stripe goes to the center terminal of the plug.

There should be a diagram on the adapter otr the tool with the polarity.
 
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