Dave the Embalmer
New Member
Ok, I'm building an LED flashlight. It uses 12 high power LEDs, and what it all comes down to is that at 4.5V (3 "D" cells), I only need 5 Ohms of resistance. Now, a whole lot of energy goes into heating up that 5 Ohm resistor a whole lot. Is there a more effecient way? What I'd like is to be able to perhaps use PWM to short the battery out through the leds in quick bursts or something to that effect. I can use discreet components, but preferably stuff I could control from a uC. (Transistor, ADC for voltage/current sense built-in with the uC I'm using, a PIC16F876).
Thanks!
Thanks!