12V to 3V?

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Forum Name: General Discussion
Forum Discription: General Mobile Electronics Questions and Answers
URL: https://www.the12volt.com/installbay/forum_posts.asp?tid=76123
Printed Date: May 26, 2024 at 3:31 AM

Topic: 12V to 3V?

Posted By: Jasonb61
Subject: 12V to 3V?
Date Posted: April 11, 2006 at 7:54 PM

Hello,

I just bought a new Audiobahn DVD player that comes with a regular remote and a steering wheel-mounted remote...

Anyways, I'd like to hardwire the remote to the steering wheel and I was wondering how I should properly do it.

well, the part I'm a wondering about is what proper voltage to put into it... It came with a 3V battery so how should I properly step down the 12V to 3V?

Thanks,
-Jason

Replies:

Posted By: Jasonb61
Date Posted: April 12, 2006 at 10:45 AM

Hello,

I am wanting to hard-wire a remote for my CD player and the battery that was in the remote was rated at 3V so I need to drop the input voltage from the truck, which is 12V, to 3V...

I bought a Adjustable Voltage Regulator (LM317T-Positive) from Radio shack and I was wondering if anyone knows how to configure this so it's output is 3V from a 12V input.

Thanks,
-Jason

Posted By: firstrax
Date Posted: April 12, 2006 at 11:54 AM

Vout = Vref (1+(R2/R1))+Iadj R2

So, R1 between Vout and adjust pins = 240 ohms and R2, adjust to ground = 336 ohms.

Posted By: firstrax
Date Posted: April 12, 2006 at 3:37 PM

Illustrated version. posted_image

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