LED headtorch

[Pete Matthews]

I need help with a simple circuit. I am looking to make an LED headtorch for a college assignment, and need the it to have a maximum brightness and a dimmer brightness.

Please can you help me with how I achieve this? I'm looking to run the torch off 2 AA batteries.

Thanks for your time.

Pete

 

[justDIY]

two aa batteries is not much if you're wanting to build a white torch ... red leds would work good, but white would be dim - unless you build some sort of step-up power supply

regardless .. for two brightness levels ... how about a single pole double throw switch, with center off ... just use two different current limiting resistor values ... less resistance for bright, more resistance for dim.

 

[Pete Matthews]

LED torch

What Voltage would you suggest? I have Petzl that runs off just 3 AAA batteries.

Thanks for your help.

Pete

 

[Someone Electro]

it much depends on the LED.White and blue are mornaly from 3-5 V

 

[tikbalang]

http://elm-chan.org/works/led2/report.html

 

[audioguru]

Shouldn't students do their own research about a project?
Then they can ask questions about it if they want.