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Author Topic: Switching Power Supply Plans?  (Read 70 times)
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I am building my first board and I want to build in AC powered DC supply to the board. I only need to power an AtMega from Arduino Uno, 1 LED, LM35, a 16x2 LCD with backlight, and drive the gate on a SSR. There are so many schematics and such for power supplies out there I am overwhelmed. I want to use the switching one to avoid giant expensive transformer. Seems no one does that anymore. I am told there are IC's out there that make switching power supplies very easy now but I have no idea which one. Could someone point me in the right direction?

Thank You.
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BCC AZ USA
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It gets hot so it must be working
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I use USB phone chargers for a lot of my projects.  They output 5V at 500-600 mA.  They are pretty compact, too. I get them at the local thrift store for one or two dollars apiece.  Look for the ones with mini USB connector.
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The vendor I use...
http://www.cui.com/
http://www.cui.com/catalog/power/ac-dc-power-supplies/external
http://www.cui.com/catalog/power/ac-dc-power-supplies/internal
(They also make a nice piezoelectric buzzer.)

Given the fact that you have not provided any details about power consumption I respectfully suggest that trying to build your own power supply is a bad idea.
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I don't know the actual power consumption yet because I haven't run the numbers but the breadboard runs the whole thing off Arduino's +5 so it cannot be too much. I don;t want to use some over the counter thing because I plan to use this LM35 to control 120VAC and I don;t want to have to add in a wall plug inside the project box just to convert incoming 120 to a +5 VDC. That would make the project box huge. I just need to build what ever is inside one of those small wall warts onto the PCA. I am familiar with Linear power supplies but not the newer, smaller, switching ones. Don't want a giant transformer when I don't need one smiley

Thank You
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Lacey, Washington, USA
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Building a switching power supply that runs from 120 or 240Vac is a rather hazardous thing to do. Are you certain you are ready for that?
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Steve Greenfield AE7HD
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