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Power Supply

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aparlett:
Hey Guys

Looking for a cheap power supply that has +/- output round $100 mark? nothing too high powered just to play around with precision op-amps.
any suggestions will be a great help.

thanks

eevblogfan:
hey

Why dont you use cheap ass 12~ 30V 9W or so wall wart and use voltage splitter creating virtual ground using Lm358 one pot and pair of NPN and PNP power transistors ?  I don't have the schematic now  :palm:

pleas some one give him the proper schema  :scared:

all I can find now is that ( should be good anough as op amp baiasing supply )

http://www.circuitstoday.com/wp-content/uploads/2008/08/voltage-splitter-using-opamp.JPG

Cheers :)

IanB:
If you only need a few milliamps than back-to-back 9 V batteries will work fine.

aparlett:
Im going to uses two 9 volt batteries for now but would like to have a proper supply as im going to be suing it alot more in the future.

eevblogfan:
hey


Schema is the first photo and the final circuit I've built ( including Lm317 , but not really needed I think ><" )

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