How to Make A Solar Cat Eye Road Stud in Lab

Traditionally, lanes on roads are marked in a passive way with reflecting road studs and high visibility paint, often coupled with other reflectors on short columns at the sides of the highway. However, on prosperous roads with dipped headlights these passive road studs are harder to catch, and the range of visibility is dramatically reduced,while in rainy, snowy and foggy days they can become completely invisible. In recent years, some new solar cat eye road studs (active road studs) have appeared as options for roadway designers, and a simple approach to the new trend is accounted here.
In last passage, the materials to make a solar cat eye road stud are introduced. Except for those, a toroid core transformer is also needed. Next, I will introduce how to make a toroid core transformer.
 
(1)Take one piece of 30 SWG enamelled copper wire.
(2)Start off by sticking the wire through the middle of the small toroid core.
(3)Wrap the wire around the toroid to make 20 turns.
(4)Repeat the process with the second piece of 30 SWG enamelled copper wire.
(5)Now join the two coils (windings) of the toroid. For this Take one end of the first coil on the one side of the toroid and , one end of the second coil on the other side of the toroid. Now connect them together. 
These two wires forms the centre pole of the toroid as in the circuit diagram which is connected to the positive terminal of the battery (Note the two black dots next to the toroid windings in the circuit diagram. These two dots indicate the polarity and as you can see the two windings are opposite to each other. Make sure this polarity is in right order).
 
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