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Power Supply for RF Modulator

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Thread Starter

CircuitSurfer

Joined Sep 19, 2009
25
Hi I need a power supply for my project. I intend to take the plug off the the phone charger but I have no multimeter to know which line is positive. One of the two wires have a white stripe running on top of it. Would that be the positive?
 
Z

ziouranio

Joined Jul 23, 2009
20
CircuitSurfer said:
Hi I need a power supply for my project. I intend to take the plug off the the phone charger but I have no multimeter to know which line is positive. One of the two wires have a white stripe running on top of it. Would that be the positive?
Click to expand...
I have experienced both cases where the white strip indicates the positive and cases where the strip is on the negative.... the only way to be sure is to use a multimeter and check.
 
Last edited:
SgtWookie

SgtWookie

Joined Jul 17, 2007
22,230
Here is a simple and cheap low voltage polarity checker you can build:



The probes can be just plain wire.

Both LEDs need to be in the circuit, as they protect each other from excessive reverse voltage.
 

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