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Anonymous Poster

How Do I Decide My Power/Current/Voltage Input

03/01/2011 3:58 PM

Here's my setup.
I have a project, where I am using a 12 volt fan with 200mA of current and 2,4W of power. I am also using 15 LEDs lights, 5 red, 5 green and 5 yellow.
Seeing as I am complete novice at electronics, I need help deciding on what resistor strength and size batteries I need to use? I presume 8 1.5V AA batteries are required to power the fan, however this only gives me around 5 hours of battery life. Thanks for all your help.
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redfred
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#1

Re: How do I decide my Power/Current/Voltage Input

03/01/2011 4:12 PM

Try this.

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JohnDG
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#2

Re: How Do I Decide My Power/Current/Voltage Input

03/01/2011 7:23 PM

You don't get anything for nothing. Even neglecting the LEDs, if you want longer life, you'll need to go to larger (higher ampere-hour, or Ahr) batteries, or use a mains power supply.

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Anonymous Poster
#3

Re: How Do I Decide My Power/Current/Voltage Input

03/01/2011 10:44 PM

join the yahoo 12 volt dc power power group. Steve Spence or Nando can design or answer any questions you may have with a 12 volt application.
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Randall
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#4

Re: How Do I Decide My Power/Current/Voltage Input

03/02/2011 5:07 AM

Do you have to use batteries?

Are the LEDs all lit independently, or do they come on together or in groups?

A power supply from a scrap PC is your best source of a 12V supply.

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