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Rocco99 Posted - Mar 24 2014 : 10:15:48 AM
Would like some help as a newbie in designing a power supply to provide 5V DC at up to 3 amps. I've seen a circuit diagram using a voltage regulator (LM338T) on this site. I'd really like to see or have more construction details as this will be a first project. Any help that can be provided would be highly appreciated.
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Aaron Cake Posted - Mar 25 2014 : 5:21:43 PM
The datasheets for all those linear regulators provide good sample circuits which work well. You can basically just copy them and use as-is.
Rocco99 Posted - Mar 24 2014 : 3:27:47 PM
Thank you.
audioguru Posted - Mar 24 2014 : 2:09:56 PM
The circuit you found makes an output up to 30V. When it is turned down to only 5V then the regulator has 29V across it which makes it get extremely hot and shut down unless the maximum output current is very low.

Make changes as follows:
1) Use a transformer voltage that is 7VAC or 8VAC at 4A.
2) Use a pot resistance that is 500 ohms.
3) Use a resistor resistor value that is 120 ohms.
Rocco99 Posted - Mar 24 2014 : 11:26:46 AM
Sorry, the schematic I looked at uses the LM338K not the LM338T

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