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Topics - tefatronix

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Solid state Tesla coils / Self-oscillating nano Tesla Coil (14.3 MHz)
« on: October 31, 2017, 09:27:37 PM »
Hi all, I'm a student from the Czech Republic and this is my first post on this forum, in which I am going to show you my miniature Tesla coil.

I have already posted this in a few Facebook groups before, but in case anybody is interested, here it is.
This is my smallest Tesla coil, the circuit board measures 25x20 mm, the secondary coil has the following parameters: 14.3 MHz fres, 10 mm diameter, 25 mm winding height, 0.1 mm wire diameter.

It is very similar to Slayer exciters and to a self-oscillating coil another member posted here some time ago. The input stage uses extra 1N4148 diodes to decrease the capacitance of the Zener diodes and uses a simple circuit (zener, trimpot, some resistors) to slightly bias the MOSFET gate. The output stage wired in a class E like configuration, however I don't use any capacitor in parallel to the MOSFET's output, as it seems to be in tune even without it. I haven't measured the waveforms, as my scope is quite slow and its input capacitance is not negligible. The MOSFET I use here is an IRF510 - this one was chosen because of its low gate capacitance, low price, easy availability and fairly high speed (I think it would be quite challenging to get an IRFP460 to run at such frequencies  ;D )

I built this coil to have an "improved version" to replace my previous nano Tesla coil, which got damaged and was very inefficient anyway (based on a BD139 NPN BJT in a very similar circuit to this one - it had a different bias circuit and a 150 pF tuning capacitor). I've already had this coil laying here for a few weeks or even months, but I was too lazy to write any documentation, but finally got myself to do it (full documentation is here).

This coil can run off a 12-14 volt power supply without overheating, it can momentarily tolerate higher voltages (I tested it at voltages over 24 V) as long as the input is pulsed, otherwise it will overheat fairly quickly. At voltages under approximately 15 V or so, the discharge has to be started manually with a piece of metal, etc.

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