Simple SSTC

Introduction: Simple SSTC

This is a simple solid state Tesla coil with one MOSFET

Step 1: What You Will Need

IRF 540 MOSFET (other similar mosfets will work IRF 510, 630)

Heatsink

50 Ω resistor

1 kΩ pot

1 μF capacitor

Cardboard, glass or bakelite tube

Step 2: Operation

The secondary coil gest warm or hot, use cardboard, bakelite or glass tube. The secondary is made of magnet wire 200 - 400 turns, 0.1 - 0.2mm thickness. The coil dimensions are not critical (30 - 40 mm diameter)

The primary is only 1 turn, 4-5mm bigger in diameter than secondary, 1mm magnet wire, placed at the bottom of the secondary.

Turn the 1k pot when the spark discharge appears on the top of the secondary. At best adjustment the spark is longest and the mosfet gets warm slowly. If it don't oscillate, change the connections of the primary!

Resonant frequency depends on secondary coil dimensions and number of turns. It's between 2 and 10 MHz.

If you operate this tesla coil at higher performance (40-50W) the mosfet gets hot, it requires large heatsink.

Placing a top capacitance to the secondary, the spark gets longer, and the mosfet will be cooler.

The spark produces ozone!

Step 3: Video

3 People Made This Project!

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25 Comments

0
BuzzWithSreyon
BuzzWithSreyon

Question 3 months ago

I used 19v 2.3 amps smps and made this circuit with irf540n mosfet , after running it for some seconds it was getting very hot, I can't even touch the mosfet then the source and drain get shorted.... how do, I cure this problem?

0
Golu20
Golu20

1 year ago

What would be the turn ratio if I use 230VDC instead of 20-40v and also what would be the values of resistor and POT?

0
Adam Bricker
Adam Bricker

Tip 1 year ago

I like simple circuits, but this one needs one addition in order to prevent the MOSFET from dying due to excess gate voltage. I would put a 9.1V 1W zener diode with the negative band tied to the MOSFET gate and the other end tied to ground. The zener you select may switch off too slow for this circuit but it will still work and the MOSFET will run cooler also. The threshold voltage on an IRF-540 is 4 volts max, if you use a different one make sure your zener diode voltage is between the max gate threshold voltage and the max gate-source voltage, check the datasheet for your MOSFET. Also, don't substitute a 0.1W zener diode, you will destroy the gate on the MOSFET because the zener will get hot and the gate voltage will drift all over the place. This is personal experience speaking.

0
Tanner_85
Tanner_85

1 year ago on Step 1

Actually I've not replicated this instructable, but I'm designing my own MOSFET Slayer Exciter these days, and everybody in the world is using IRFP460 transistors or IGBTs, and they can't be driven by such a simple circuit. I think you should implement a gate driver IC in the end, if you are serious about the performance of your Tesla Coil.

0
BáchT5
BáchT5

5 years ago

so cool, but you should use mosfet z44, the lighting is bigger

0
Francesco Tiboni
Francesco Tiboni

Reply 2 years ago

So if I use irfz44n, what I Need to change

0
radiojamming
radiojamming

Reply 5 years ago

Yes, but I have only this type of mosfet, and unfortunately I have no stronger power supply.

0
Ацетон
Ацетон

Reply 3 years ago

Can i use resistor like 250Ohm and 10W to decreace gate voltage?

0
wetzhy
wetzhy

3 years ago

Could I use a 470 ohm resistor and a 10k ohm potentiometer?

0
wbuchta
wbuchta

3 years ago

You copied keystone science

0
Ацетон
Ацетон

3 years ago

Can i use 40N60FL and split the schematic? Like i make powering of primary with transisor on rectified 220v (with current limiting,with fuse), and use 12-19 v powering to drive the gate?

0
BorisK23
BorisK23

4 years ago

Hey can i use a 2.2uF capacitor instead of 1uF?

0
radiojamming
radiojamming

Reply 3 years ago

Yes, you can.

0
ELECTRONICS3
ELECTRONICS3

4 years ago

irf540 and irfp260 that I used have max gate voltage 20V , when I apply 24V mosfet burns !! how to protect mosfet , can I conect irfp260 in series or use other mosfet !! can zener beetwen G and S protect it from overvoltage!!!!!!

0
radiojamming
radiojamming

Reply 4 years ago

First, the pot between gate and source must be set to minimum resistance, then slowly increase it until small plasma flame appears on terminal. wneh the plasma is the longest, it is the proper adjustment. Don't run the device long time with inproper adjustment, and use a large heatsink. I have no problem with irf540

0
TheGreatResistor
TheGreatResistor

4 years ago

Hey Man

Amazing circuit and output you have but i have a 18v 3a supply will this work?

0
radiojamming
radiojamming

Reply 4 years ago

Try it, if it will not work, build a simple voltage doubler.

0
ELECTRONICS3
ELECTRONICS3

4 years ago

works but I use irfp260 and I burned 2 of them

0
electro techster
electro techster

4 years ago

Nice dude will this work at 12 volts ,i got 4 mosfets rated at 150v 45 A at continuous use,but minimum gate voltage is 10v to turn it on will it work?

0
BáchT5
BáchT5

5 years ago

but if i have a coil look like coil transformer and it's stacked coils, so can I do tesla by it?