# Dynoflex charger

Discussion in 'The Projects Forum' started by vikinpcc, Jul 18, 2011.

1. ### vikinpcc Thread Starter New Member

Jul 18, 2011
1
0
Could somebody help me name the electrical components that were used in this project?

I am intending to do this for my school project. (Ofcourse with improvisation)

But i am confused by the electrical terms that are being used.
It will be very helpful if somebody could help me with the names of the components, so that i can buy those and start putting it together.

With specification will be helpful, because im studying mechanical and this project involves alot of electricals and electronics which i have no idea about. Well not that much! =)

Thank you very much for your help!

Cheers,
Vik

2. ### praondevou AAC Fanatic!

Jul 9, 2011
2,936
489
I recommend you have a look at the following links first.

He used two coils, obviously he wound by himself.
http://en.wikipedia.org/wiki/Coil#Electromagnetic_coils
Then he took the AC-Voltage from the coils, passed them through a rectifier.
To smooth the rectified AC-voltage he put a electrolytic capacitor on it.
http://en.wikipedia.org/wiki/Diode_bridge
The generated DC-Voltage then passes through a simple 5V linear regulator.
http://www.eidusa.com/Electronics_Voltage_Regulator.htm

While the rectifier circuit can be easily built there is one important thing missing. The number of windings for the two coils. He certainly found this out by trial and error, because the voltage generated depends on the speed of the Dynaflex and he has to make sure that the input voltage of his voltage regulator stays under the maximum rating which is usually 36VDC.
Also, depending on your load you may need a heatsink for the regulator, they are horribly inefficient.

There are other more complex ways to built the circuit, but I guess you want to keep it simple.

I suggest you contact the guy for information on the coils.

Edit: just found his website http://scott-n.com/wp/?p=19

3. ### wayneh Expert

Sep 9, 2010
12,368
3,224
Excess voltage would be hard to develop as long as the load is attached. The internal resistance in the coil will shave voltage off the emf if any current is flowing in the coil, due to an applied load at the DC end.

But I agree it would be smart to avoid re-inventing the wheel by starting with his coil specs. Even just the wire gauge would be a very helpful piece of information.

That rectifier (with filtering capacitor) he's using looks like what you'd find inside a standard DC wall wart. Tear one open if you have a spare, and you'll have a ready made board just like in the video. You just need to disconnect the transformer from the wall wart and wire in your generator in its place.

4. ### praondevou AAC Fanatic!

Jul 9, 2011
2,936
489
He used 2 coils in series 26-gauge , 320 windings each. Information from his website. He also bought neodymium magnets which he put inside the dynaflex. http://scott-n.com/wp/?p=19