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Old 09-05-2012, 12:25 PM   #3
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Join Date: Feb 2010
City & State: S.F. Bay area
My Country: USA
Line Voltage: 120V 60Hz
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Posts: 35,745
Default Re: How to test a voltage regulator

Suggestion: You can tell if it is adjustable regulator by looking to see if it has a resistor between the ADJ pin and the OUTPUT pin, and also ADJ pin and circuits ground.
Vout = 1.25 x (1 + R2/R1)
R1 is the resistor between ADJ & V OUT
R2 is the resistor between ADJ and Ground.

Notes: the output voltage of the FIXED Regulator can be boosted by adding a resistor between the GROUND pin and circuit Ground.
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Basic LCD TV and Monitor troubleshooting guides.

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