how to drop voltage from 12v to 2.5v

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megatfauzi76

Copper - Posts: 93

Joined: December 14, 2006

Location: Malaysia

Posted: July 17, 2008 at 9:34 PM / IP Logged

Hai

I need help. Can anyone guide or give some idea, how to drop 12v from car battery to 2.5v? I need some inffo what kind of resistor and the ohm size of resistor that can drop 12v to 2.5v.

Really need help, coz im goin to do my own bypass kit for my remote start.

Thanks

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dtk1

Copper - Posts: 179

Joined: June 21, 2007

Location: United States

Posted: July 18, 2008 at 12:42 AM / IP Logged

what kind of car ? why not used 1101t DEI

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megatfauzi76

Copper - Posts: 93

Joined: December 14, 2006

Location: Malaysia

Posted: July 18, 2008 at 1:46 AM / IP Logged

Mine is nissan versa... Can you give some advise what type of resistor i need to use?

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KPierson

Platinum - Posts: 3,527

This member consistently provides reliable information

Joined: April 14, 2005

Location: Ohio, United States

Posted: July 18, 2008 at 8:38 AM / IP Logged

Do not use a resistor. Use an adjustable voltage regulator - like a LM317.

You can't get a solid voltage using a resistor only. At bare minimum, you would need two resistors to make a voltage divider. Voltage dividers are great for reference voltages but NOT for powering anything as they lack the ability to provide any type of real current without changing the output voltage.

Kevin Pierson

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KPierson

Platinum - Posts: 3,527

Joined: April 14, 2005

Location: Ohio, United States

Posted: July 18, 2008 at 9:25 AM / IP Logged

http://www.electronics-lab.com/articles/LM317/

Check out that page. It looks like if you use two 240 ohm resistors you will get the 2.5vdc you are looking for.

Kevin Pierson

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how to drop voltage from 12v to 2.5v

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