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### Author Topic: 3v Dc to 12v Dc to flash strip led'S  (Read 2815 times)

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#### Manie Serrao

• Guest
##### 3v Dc to 12v Dc to flash strip led'S
« on: July 08, 2012, 21:25:51 PM »
Hello All,
I want to build a circuit to flash strip LED's every 15 seconds but must power it with two AA 1.5volt alkaline batteries
The strip LED's I have are the "Hi Bright" x 12v x 4.9 watt / meter. The strip will be just under half a meter. How long a set of batteries would last is also a question mark.
I have never used a DC to DC converter chip, but am not biased towards the discreet component style..........just wish I had plenty of time to fiddle....
All help would be greatly appreciated..........

Regards
Manie

#### cheerio

• Sr. Member
• Posts: 306
##### Re: 3v Dc to 12v Dc to flash strip led'S
« Reply #1 on: July 09, 2012, 15:19:11 PM »
you might try this one. But the current provided by this does not leave much room.

#### kam

• Hero Member
• Posts: 1849
##### Re: 3v Dc to 12v Dc to flash strip led'S
« Reply #2 on: July 10, 2012, 08:55:34 AM »
plus, you should keep in mind that the output power will be less than the input power by a factor. If you power this with two 1.5V batteries able to deliver let's say 1A of current (that is 2.5W total) and your converter has 90% efficiency, the output power will be 2.5x0.9=2.25 watts. If the output voltage is 12V, the output current cannot be more than =2.25/12 = 0.18A

#### Manie Serrao

• Guest
##### Re: 3v Dc to 12v Dc to flash strip led'S
« Reply #3 on: July 10, 2012, 12:35:00 PM »
Thanks Guys,

Will build it and post the results