http://www.outdoorlanternsonsale.com/rechargeable-flashlight/
Need Diode bridge help?
I've been working on this for a while now and I'm sick of it so I figured its time to ask real people...
I'm building a diode bridge to convert ac current to dc current for a rechargeable flashlight. I am connecting a magnet tube wound with magnet wire to the ac + and - and I have a capacitor connected to the + and - side of the dc
I am using this image here
http://upload.wikimedia.org/wikipedia/commons/2/29/Diodebridge2.png
to figure out how to connect the bridge. I have hooked this up to a Voltimeter and when I hook the dc to the - and + and shake it to generate current I still get some - current when I shake it and I also get some ac where the dc is. what is wrong?
please help me
and if it helps you I am using an 1n4007 diode and a Aerogel Super Capacitor
Your generator will give pulses of current each time the magnet enters, and leaves the coil. The rectified pulses will be of short duration, and may not read properly on a meter(especially a digital one). As long as you wire the polarity of the bridge as you have described, the capacitor should integrate the pulses and will charge up. However, to have a constant light output, you will need to regulate the voltage to the light source(bulb or led). Use a low drop out 3 terminal regulator selected for either the bulb voltage, or as a current sink to regulate the led.
Hope this was helpful. Any questions, just email me. Good luck.
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