Simple SSTC

Intro: 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

Share

Recommendations

  • Audio Contest 2018

    Audio Contest 2018
  • Metalworking Contest

    Metalworking Contest
  • Fix It! Contest

    Fix It! Contest

43 Discussions

0
None
wetzhy

2 months ago

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

0
None
wbuchta

11 months ago

You copied keystone science

0
None
Ацетон

1 year 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
None
BáchT5

2 years ago

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

2 replies
0
None
radiojammingBáchT5

Reply 2 years ago

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

0
None
BorisK23

1 year ago

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

1 reply
0
None
ThomasK19

2 years ago

I always wanted to make a Tesla coil, but the ones I found looked pretty much too big. This seems to be a nice one. What's the wattage of the 50 Ohm resistor?

11 replies
0
None
TheGreatResistorThomasK19

Reply 1 year ago

How to protect the gate from 40v 0.5A because irf540 is only 20 gate voltage

0
None

Adjust the pot between gate and source to minimum (between gate and 50 ohm to maximum) and increase it slowly when a small plasma flame appears. That's the correct adjustment. With a large heatsink, during adjustment, I did not burn the mosfet.

0
None
radiojammingThomasK19

Reply 2 years ago

The resistor is 2W, my device is running at 40V, 0.5A = 20W. The resistor doesn't get hot, I don't know what about higher performance.

0
None
PiratCradiojamming

Reply 2 years ago

Can I use a 51 ohm resistor instead of a 50 ohm resistor?

0
None
ThomasK19PiratC

Reply 2 years ago

For sure. General resistors have an accuracy of 10%. 50% +- 10% gives a range of 45 Ohm to 55 Ohm. So even with a 5% accuracy you would be on the safe side.

0
None
PiratCThomasK19

Reply 2 years ago

Thanks for the fast reply!

I am planning to build this little tesla coil.

I have a few more questions:

How did you make the 40v power supply?

How many secondary windings did you use?

And in which direction do I need to wind the secondary coil?

0
None
electro bunny PiratC

Reply 2 years ago

Buy a step up boost regulator, or you can just make one for fun. If you dont know what a boost converter is, its basically takes low voltages and converts to a higher voltages. search them up.

0
None
PiratCelectro bunny

Reply 2 years ago

How many secondary windings did you use and in which direction do I need to wind it?

0
None
radiojammingPiratC

Reply 2 years ago

Hi! Sorry, I know I reply late, but I was busy recently. 51 ohm will work well. Doesn't matter what is the direction of the secondary, if there is no oscillation, change the polarity of the primary. It's easier. First, try with 200-300 turns on a cardboard tube. Power supplies between 20 and 40V will work. My power supply is a small, 20W transformer from a satellite receiver, a rectifier bridge, and a filter capacitor. Good luck!

0
None
PiratCradiojamming

Reply 2 years ago

I only have a cardboard tube with a diameter of 5.5cm, will it work?

0
None
radiojammingPiratC

Reply 2 years ago

Yes, diameter is not critical, but you can use glass, bakelite tube etc. any other material that not melt because secondary coil gets very warm, almost hot during operation.