Guys you are great!
I used electrolytic capacitors, but with frequencys above 100kHz I think I should use ceramic ones.
The transistors used were the standard 2n 3904 but anything shoulld work with a switching time below 10 us (=100000 Hz if I'm not mistaken).
Voltage will be 9V in the final circuit so with 5v thershold on the boost converter mosfet this should work.
The boost converter:
As I understand the "on" time should be less than the time that takes the coil to saturate.
And the back emf usually is al lot faster than the forward(?) emf so the multivibrator should oszillate like this:
----||----||----||----||----||----|| rather than:
To archieve this one resistor has to be greater than the other, no problem here.
The capacitor used in the bc. was a ceramic capacitor, is this ok? As I understand the purpose of this thing is to buffer the pulses nothing more.
I also used a standart npn transistor instead of a mosfet in the bc. This might explain why it got so hot...
Unfortunately until the 15th I have to study for three upcoming tests so I can't work on this until then. But after that I will be able to get my hands on an oscilloscope and will post some pictures of how I adjusted the circuit and if everything works out also a quick and simple tutorial on how to create a boost converter without a 555.
I also bumped into this site which was.. not as helpful as I hoped since there is little explaining which paramaters change what.http://uzzors2k.4hv.org/index.php?page=450vboostconverter