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Twin luxeon lights.
agamlem wrote: What regulator are you using? It's a micrel MIC29302T, in a TO-220 package. This one is cool as it's adjustable, and also has a shutdown pin, which I may use to shut the thing down when the battery voltage drops below 6V. I figured that dropping from 7.4 to 6.0V with a series regulator gives me around 80% efficiency anyway, so the gains to be made by using a switching regulator are only modest. I use a pwm circuit based around a 555 timer. I thought about getting hi tec and using a microcontroller with an a-to-d to monitor the battery and give various dimming levels. But it seemed like too much hassle. So do you use a fixed duty cycle, or some sort of feedback loop to set the output power? I push my vista lights a bit harder at 7.2 volts (or sometimes more) since they do it themselves for some models. They have 6 cells in their batteries. I run a 10 watt head and a 15 on the bars. I like to hit about 80-90% daylight speed of road. Mine are usually run from 5 sub-c NiMH cells, so 6V is the go. I reckon It's plenty bright enough, and I don't want to sacrifice bulb life, as they're expensive. Regards, Suzy -- suzyj |
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