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LM317 output question

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Sorry i lied about vout for the sake of simplicity. Vout should be 2.5V 1.5A.

3128vmw.jpg
 

Surpassing my wildest dreams. Never thought that LM317 would survive > 1A reverse current during negative input voltage cycle.
 

I think the LM317 is destroyed by the reverse current and is shorted. Then it is a piece of wire that lights 12V light bulbs.
 

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