Consider at stationnary radar at the origin ##z=0## and a target (speed ##v##) moving along the ##z## axis and away from the radar. The radar is sending plane waves (frequency ##f_i##) to the target and they come back to the radar (the radar is then both an emitter and a receiver). I am...
http://upload.wikimedia.org/wikipedia/commons/8/83/Joule_thief.png
Ok so today they talked about what we had to do to figure out the solution (more or less). They want us to mathematically solve it and then check the results experimentaly. So they said that they want us to figure out a relation...
I got it from wikipedia (the circuit of the school is exactly the same), I think you get more info on how the circuit works there : http://en.wikipedia.org/wiki/Joule_thief . By what is the overall goal of the school project, do you mean what is the purpose of the circuit? If so, the circuit...
Hi everyone,
I have to build a simple Joule thief circuit for school. Here it is :(http://upload.wikimedia.org/wikipedia/commons/8/83/Joule_thief.png). The resistance of the resistor is fixed to 1 kOhms, the voltage across the "dead battery" is about 1.5V, the transistor needs about 0.7V to...