stepping voltage down

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Slammed_Am

Copper - Posts: 117

Joined: December 07, 2002

Location: United States

Posted: July 02, 2008 at 5:04 PM / IP Logged

I am looking to some how power an accessory that runs off of 9 volts DC in an vehicle that obviously runs on 12 volts. Basically I am trying to find out how to step the vehicles 12 volts down to 9 to run this accessory.

Would it just be as simple as adding a resistor on the positive wire?

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jeffwhiteman

Copper - Posts: 124

Joined: October 20, 2006

Location: United States

Posted: July 02, 2008 at 5:51 PM / IP Logged

you would nee a voltage regulator part # LM7809. this will give you the output you are looking for. there are 3 leads. voltage in(in this case 12 volts) ground, and voltage out 9 volts. what are you trying to power? this can supply about 1 amp.

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i am an idiot

Platinum - Posts: 13,670

This member consistently provides reliable information

Joined: September 21, 2006

Location: Louisiana, United States

Posted: July 02, 2008 at 7:44 PM / IP Logged

jeffwhiteman wrote:

this can supply about 1 amp.

That was the important part, I just didn't want it to go unnoticed. Depending on how much current you need, you can parallel several of these. You may need to mount them on a heat sink of some sort.

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Slammed_Am

Copper - Posts: 117

Joined: December 07, 2002

Location: United States

Posted: July 06, 2008 at 10:27 AM / IP Logged

It is a generic (FX-never heard of it...?) old school NES video game system. Customer picked it up off ebay, and dosen't want to invest in a power inverter. So I figured thier had to be a simpler alternative.

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i am an idiot

Platinum - Posts: 13,670

Joined: September 21, 2006

Location: Louisiana, United States

Posted: July 06, 2008 at 5:15 PM / IP Logged

If it has a Wall Wart type power supply, it should tell you how much current the power supply is capable of producing. It will be right next to where it says 9 volts. It will probably be 500 or 750 Milliamps. Or it could be as much as a couple of amps. That is the number we are concerned with.

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Slammed_Am

Copper - Posts: 117

Joined: December 07, 2002

Location: United States

Posted: July 06, 2008 at 9:04 PM / IP Logged

9v 300mA

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KPierson

Platinum - Posts: 3,527

Joined: April 14, 2005

Location: Ohio, United States

Posted: July 06, 2008 at 10:19 PM / IP Logged

If you go with a 7809 and our going to run more then ~100mA per 7809 you will need a heat sink for each 7809.

Kevin Pierson

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stepping voltage down

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