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)


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



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You copied keystone science

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?

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

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

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

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

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?

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

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.