12V to 3V?

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Jasonb61

Copper - Posts: 81

Joined: December 01, 2004

Location: United States

Posted: April 11, 2006 at 7:54 PM / IP Logged

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

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Jasonb61

Copper - Posts: 81

Joined: December 01, 2004

Location: United States

Posted: April 12, 2006 at 10:45 AM / IP Logged

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

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firstrax

Copper - Posts: 113

Joined: January 18, 2006

Posted: April 12, 2006 at 11:54 AM / IP Logged

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

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

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firstrax

Copper - Posts: 113

Joined: January 18, 2006

Posted: April 12, 2006 at 3:37 PM / IP Logged

Illustrated version. 12V to 3V? -- posted image.

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12V to 3V?

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