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Author Topic: Building LED flashlight, need proper circuit  (Read 3409 times)

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Jamiesan

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  • I'm building a flashlight... feel free to email me
Building LED flashlight, need proper circuit
« on: October 20, 2014, 00:11:22 AM »
I like the battery boost circuit here on this website using the MCP1640 chip; that's pretty much what I want, but I'm not sure if it would work for my flashlight idea.

Here is the specs for what I want to do:

4 - AAA batteries

4 - 10mm 1W LEDs, DC Forward Current: 300mA, DC Forward Voltage: Typical: 3.4  V  Max: 3.6 V, 40-45 degree viewing angle.

I'm pretty good at building things, but electronic theory just goes way over my head... Any help will be greatly appreciated.  I've included a photo showing how I want to put this together.  I want this flashlight to be flat and lay flat, not cylindrical like most flashlights, yet run on 4 common AAA batteries.  It will be about the size of a credit card, about 1/2 inch thick and made of aluminum bar.

How should I build the driver circuit?

THANKYOU,  -Jamie

kam

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Re: Building LED flashlight, need proper circuit
« Reply #1 on: October 20, 2014, 20:58:37 PM »
Hello Jamie,

actually the MCP1640 will not fit your needs. What you need is a step-up constant current driver. Maybe the LT1618 will do...

Jamiesan

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  • I'm building a flashlight... feel free to email me
Re: Building LED flashlight, need proper circuit
« Reply #2 on: October 24, 2014, 14:25:08 PM »
 Thank you for the quick response, I've been working my day job and very busy, I will check out that chip you recommended and get back with you shortly.

Thanks again,

Jamie