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Magnetic induction safety bike lights. Nearly invisible design, cheap, waterproof and battery free!
DIY Contactless magnetic induction bike dynamo
I cannot tell how old this guide is.It seems you are on the right track: http://www.envirogadget.com/lamps-and-lights/magtenlight-contact-less-dynamo-bike-lamp-kit/
OK, now i've seen Dec. 2014
Hi, can you please tell me the characteristics of the relay coil?I would like to know the resistance, volts, diameter of the wire etc.When I tried to lit up a led like this, it did not work, I could hardly get 15ohms from an 880ohm relay.
Bicycle Rubberband Handbrake
Hi!As i remember it lights up, but i finally preferred to use some common 5mm leds to have a bigger surface.For best rusults i suggest you to use a pre-winded coil, there are many more turns and it is more precise.In this other project i experemented myself how hard is to wind up a coil :)http://www.instructables.com/id/DIY-contactless-magnetic-bike-rim-dynamo/
Do you think connecting a 1watt power led would lit up ?
thanks for the information. I will try it with a meta piece that can magnetize and let you know my result..
Go check: www.teksel.net and You'll find a nice solution to control Your dynamo
It isn't just to have the coil. It needs a core allso.. the core is to be of iron. The magnet will magnetisize => the core, which will induct a altering AC electric field to the coil.
Go and check out: www.teksel.fi There You´ll find a nice solution to control Your sustem
hi , i read some where saying that coil should be as close to the magnet and also something like if possible magnetic filed can cover larger surface area. so i took a perf board and wounded up copper wire which i took from a 6v 10A DC relay. At first i tried with the relay's coil directly. But didnt work out( it picked up only when the magne got in direct contact). so i thought this coil wounded around the perf board should work, but even this one didnt help. Am i making a silly/blender mistake ?(i scraped all the copper contacts in the perf board which lies beneath the windings, and the LED is connected in opposite way, so if current flows in either ways one of the LED should be ON)
hi, i made a coil using a perf board, so that it can stay flat and close to the magnet(i removed the copper contacts of the perf board beneath the windings). and just to test it, i connected 2 LED's(like a rectifier, so when current flows in either direction any one of the LED stays ON). BUt this did not work,.. Am i making any silly/blender mistake... can you plz help.
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