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Old 09-05-2012, 12:28 PM   #4
tom66
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Join Date: Apr 2011
City & State: Leeds
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Default Re: How to test a voltage regulator

In addition - a working adjustable regulator will always have 1.25V between the OUTPUT and ADJUST pins.

A voltage regulator usually requires at least 0.5V more on the input to work (for most types, some require less) - for example if a 3.3V regulator only has 2.2V out - it might not be bad if the input is just 2.7V.

A slightly low output can be indicative of an oscillating regulator, due to bad caps.
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