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Old 30th November 2006, 11:52 AM   #1
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Default fixed tovariable power suply

I am a first year ELECTRONICS postgraduate student from Mumbai,INDIA. I want to know whether we can convert--dual power supply i.e. the one built using LM7805(positive voltage regulator) and LM7905(negative voltage regulator) to make a variable supply which uses LM317 (adjustable voltage regulator) ????

Basically, can we find such a circuit which establishes a relation between the two?

Hope that you will definitely help me out at your very earliest!

PLEASE HELP ME !!!!!!!!!!!!!!!!!!!
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Old 30th November 2006, 12:45 PM   #2
Did it Himself
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You can use the transformer and rectifier, caps etc. The max output from the unit will probably be about the same as with the fixed regulators though. Also a new board will need to be made as the pinouts are different.
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Old 8th December 2006, 01:07 PM   #3
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The 7905 would be replaced by an LM337 (adjustable negative regulator).
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Old 8th December 2006, 01:41 PM   #4
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if you want to establish the relationship between the two, go onto National Semi's website and search under "tracking regulator" -- it's a bit more complicated than just plugging in an LM337 for an LM3905 -- but you can control the output voltage with only one potentiometer thusly:
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