How to turn 12 volts into 5?

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BLu00dime

Member - Posts: 1

Joined: April 15, 2004

Location: United States

Posted: April 15, 2004 at 12:16 PM / IP Logged

Does anyone know how to make 12 volts into 5 i know you need a resistor but what ohm? Any help would be greatly appreciated thanks

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DYohn

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Joined: April 22, 2003

Location: Arizona, United States

Posted: April 15, 2004 at 4:34 PM / IP Logged

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xetmes

Silver - Posts: 586

Joined: May 18, 2003

Posted: April 15, 2004 at 7:34 PM / IP Logged

what kind of current do you plan on drawings? a few ways to do it, zener, voltage regulatior... each has its purpose

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audiokid1

Copper - Posts: 142

Joined: March 17, 2003

Location: United States

Posted: April 16, 2004 at 12:56 AM / IP Logged

I am assuming that you are using one thing that needs to be powered by 5 volts. If so a voltage divider won't do you much good. You are looking for a voltage regulator which can be achieved with the Zener diode. When looking for the right Zener you must pay attention to the maximum zener current rating. You may also limit the current going through the diode by using a current limiting resistor which goes in series with the load. If your application demands alot of current, you will need to use a pass transistor in series with the zener diode. These 2 components go in parallel with whatever the load is that you are trying to drive. I guess before we get to in depth with this you explain why you need the 12 volts converted to 5 volts.

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flynntech

Copper - Posts: 275

Joined: April 15, 2004

Location: United States

Posted: April 25, 2004 at 4:28 AM / IP Logged

why not use a cheap cell phone adapter?

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steph280

Member - Posts: 4

Joined: April 27, 2004

Location: United States

Posted: April 27, 2004 at 12:30 PM / IP Logged

Sorry for a newbie question, but why can't a simple resistor be used? Does the voltage fluxuate without regulators?

Thanks,

Stephen

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xetmes

Silver - Posts: 586

Joined: May 18, 2003

Posted: April 27, 2004 at 1:05 PM / IP Logged

resistors can be used... but you have to know the operating range of the device and other characteristcs to choose a proper resistor values, unless you designed the circuit its just easier to use regulators

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How to turn 12 volts into 5?

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