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Topic: Voltage regulator needed? Or not? Portable LED PWM (Read 3 times) previous topic - next topic

chuckwalla

All depends the the cells or batteries that are used. If you use a single cell and the Vf of the LEDs are 3 - 3.4v that's not going to work, you'll need a boost Reg. I would start with the easiest solution, maybe four AA's, resistors and MoFETS,  see what that gets ya. It will give you an idea of what the next step will be.

retrolefty

#6
Jan 20, 2011, 04:33 am Last Edit: Jan 20, 2011, 04:35 am by retrolefty Reason: 1
Fundamentally it comes down to you having to pick the battery you want to use and the leds you want to use.

By choosing blue leds you set a lower voltage limit for the battery voltage you can use. If you instead choose red leds, with their 1.5Vf ratings, then you increase your battery choices.

It's like that old adage, lower cost, quicker schedule, better quality, you are only allowed to choose any two.  ;)

Lefty

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