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Author Topic: power adaptor (110V mains to 9V DC)  (Read 1033 times)
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Looking for some help with making a power adapter to convert power from 110V mains to 9v DC. Any suggestions on a circuit, or a site to use as a resource?
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http://www.ti.com/lit/ml/slup224/slup224.pdf
Google search wil reward many returns, But wouldnt it be easyer just to use a wall wart (wall adapter)?. Or are you just wanting to build one for fun smiley ?
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trying to build one myself smiley
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Linear regulator, or a switching regulator?
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Designing & building electrical circuits for over 25 years. Check out the ATMega1284P based Bobuino and other '328P & '1284P creations & offerings at  www.crossroadsfencing.com/BobuinoRev17.
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yes that is a big difference, ie lump of metal with wire wrapped around it and large, or tiny, efficient and more complicated
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This looks right - what do you guys think


* Ultra-Clean-9V-DC-Power-Supply-Schematic-Diagram.PNG (13.08 KB, 659x328 - viewed 59 times.)
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looks like that will work- dont forget the large heat sink smiley
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Why an LM317 & all the parts?
Go with a 7809 part and 2 capacitors instead.
http://search.digikey.com/us/en/products/NJM7809FA/NJM7809FA-ND/805766
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Designing & building electrical circuits for over 25 years. Check out the ATMega1284P based Bobuino and other '328P & '1284P creations & offerings at  www.crossroadsfencing.com/BobuinoRev17.
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I agree use a 7809, but also a transformer with a 12v secondary to reduce the size of the heatsink.
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