![]() ![]() Meaning if you had 1 unit of magnetic field at 1cm, at 2cm you will have 1/8th of the field, at 3cm you will have 1/27th and so on. Your coil is generating a magnetic field at a certain frequency, keep in mind the magnetic field is going to 'attenuate' by the the inverse cube of the distance (magnetic field=1/(distance^3)). I'll give you a hint as to what you'll find. Then find the magnetic field through the coil (you'll need to know the area of the coil and the turns.) Then calculate what kind of energy you need at the input coil. ![]() Once you know the current use the equations located in this online textbook in chapter 11 Inductance and Magnetic energy (Yeah it requires math). You can either simulate it with a spice package or place a meter between the coil and transistor. Have you tried finding the current through the coil? Find the current through the coil. The number of turns of the coil is 300 instead of 275. My supply voltage was 10 volts because I don't have a battery of 9 volts. I need to know how to achieve a good wireless range? and What controls the range? Is it supply voltage, the base resistor or something else? I need a good range, something like 5 or 10 cm. When I put the florescent lamp inside the coil it lights up. The other terminal of the coil is not connected (open circuit). I connected the high voltage terminal to one of the coil's terminals. I brought a wire and modified its shape to be round (a circle). When I approach a florescent lamp, It does not light up. The second problem is that the circuit does not provide enough range. How can I get rid of the very high temperature of the transistor. I burnt my transistor due to excessive heat. The major problem is that the transistor becomes very hot quickly. I build this circuit and it works but I have two problems. ![]()
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