Need a 12v to 5v power supply

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Forum Name: Vehicle Wiring Information & File Requests
Forum Discription: Request Car Alarm, Car Stereo, Cruise Control, Remote Starter, Navigation, Mobile Video, and Other Vehicle Specific Wiring Info, Manuals, Tech Tips
URL: https://www.the12volt.com/installbay/forum_posts.asp?tid=78337
Printed Date: May 04, 2025 at 9:07 PM

Topic: Need a 12v to 5v power supply

Posted By: Roveer
Subject: Need a 12v to 5v power supply
Date Posted: May 26, 2006 at 8:47 PM

I have a device (vantec avox video jukebox) that I want to run in my car. It needs +5v at 2amps. Can anyone recommend a power supply that will do this (or a circuit I can build).

Regards,

Roveer

Replies:

Posted By: doibuy
Date Posted: June 02, 2006 at 7:08 AM

The eaisest thing to do is to buy a variable voltage cigarette lighter adaptor. You can do it the easy way and just plug it in to the power port, and adjust the dial to 5Volts. Or you can take the cigarette lighter plug apart (or in some cases you can just cut it off depending on where the circuit bord is at) a solder on to the positive and negative leads. Also a lot of the XM Radio units for cars use 5 Volts. You can probably get the adaptor at Radio shack. I've also seen them at Best Buy

Posted By: bbmiata
Date Posted: July 04, 2006 at 7:03 PM

Try the PowerStream PST-DC292. I've used them for all sorts of low power (2-3 amps) DC to DC applications (1.5 VDC to 9VDC adjustable with 12VDC input).

See: https://www.powerstream.com/.

Posted By: KPierson
Date Posted: July 05, 2006 at 12:34 AM

Four 1A 7805s in parallel with heat sinks!!!!

Check the data sheet and supply the recomended filtering caps and you're done!

-------------
Kevin Pierson

Posted By: rwamser
Date Posted: July 05, 2006 at 12:09 PM

I am Using a "LD29300V50" 3 Amp 5.0 VDC TO220 Voltage regulator ( Digi-Key P/N 497-4252-5-ND ) for one of my Car Powered Car Projects. Since you need 2-3 Amps you will need a "HEAT SINK" and should put a 2 Ohm 70 Watt Resistor ( Digi-Key iP/N TEWH70M2R00 ) in the Supply lead to the Voltage Regulator ( So the Voltage Regulator does not have to drop the Full 7 to 9 VDC. ) And Filter Caps along with a Fuse

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