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best schematic for a solid state tesla coil?

Can anybody please help me with a sstc schematic? I'm thinking of building a sstc for an exhibition in my school and so i might need to run it for quiet a long time(like for a day with 5min intervals), and so it shouldn't overheat and die. Though I've found some designs especially the steve ward's sstc schematic, the problem is I couldn't get the ucc37322 & ucc37321 gate driver ICs, a suitable and more available substitute would be fine(I live in India). And which mosfet should i use for this purpose, i would be running it at 220v straight from the mains(in a H-bridge confg). And is the following audio modulator going to work with this?

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This circuit is good but this one might be a bit simpler. I've made it before with not much trouble.

As for the driver issue I had to get my parts shipped in, but if you don't want to do that I would try a H-bridge driver for the GDT.

Also make sure you've got a good ground for the secondary that's what I found to be a problem.
jasshopper (author)  The MadScientist3 years ago
how to make it audio modulated? and the thing is i couldn't get ucc3732 1&2 so is there a replacement for them?
I don't know about replacements (I used to have a list somewhere but most were seriously overpowered for the job), but if you replace that part of the circuit with a H-bridge like I said it should work. An example of this is below.

sstc01.gif
On the right hand side of the circuit you will see a H-bridge circuit driving two GDT primaries at once (for your circuit this probably isn't necessary, I would probably just ignore that part). This driver can easily be adapted to your SSTC circuit if you replace the NE555 chip with a NE556 chip and use the two outputs to drive the H-Bridge.

http://www.ti.com/lit/ds/symlink/sa556.pdf

You will need to couple pin 5 to pin 8 with a 1nF capacitor. Other than that it is just direct pin matching for the NE556 is just two NE555's in one chip.

Hello. I am currently trying to work on this same project. What is the op-amp doing at the start? It looks like an integrator but the signal form + and - should be the same and the + side is not grounded like an integrator would be.

To be honest i dont really know, sorry.

jasshopper (author)  The MadScientist3 years ago
ok, i got most of it but i'm not an expert in designing circuits so what part of my sstc design should i change and to what? and what should i do if i'm using your design(richie burnett..)to make it audio modulated, any way i could use my modulator with your circuit? and if you don't mind could you make a schematic?
Well it is already audio modulated, it's got two audio inputs to an op amp. The change from 555 to 556 is very simple just look at the datasheets and match pin for pin (they have the same name, match it to no:1 of each pin you'll see) and add the 1nF capacitor as I said. Then use the two outputs of the NE556 to drive the two inputs of the H-bridge circuit I showed you (exclude the MOSFET you see at the bottom).

This should work, I am not an expert myself so I can't guarantee that it will. I might make it myself some time to test it out.

Also I wouldn't have it running all day without good cooling, maybe have a push button in front of it to turn it on for a couple of minuets. Also I would recommend putting the TC in a cage if your showing it in public TC's can damage technology, damage/stop pacemakers and kill people.

The MOSFETs you want to use in the 220V H-bridge are IRFP450/60's they are the most common for this purpose.
jasshopper (author)  The MadScientist3 years ago
is this how you said? pls check if it is correct.
SSTC improvised.png
That is almost right but in my holiday tiredness I forgot to add a few things. Just the 14,10 and 4 pins all need to be connected (not much trouble) as well as the 12 and 8 pins need to be connected.

It would also help if you added a 10K resistor from pin 9 to ground.

Also you forgot to add a 1nF capacitor between pins 5 and 8.

Sorry for the mistakes.
jasshopper (author)  The MadScientist3 years ago
did you mean like this?
SSTC improvised.png
Yes that ought to do it.
And please be careful.
jasshopper (author)  The MadScientist3 years ago
thank you , you have been really helpful.
arasmas2 years ago

Hello. I am currently trying to work on this same project. What is the op-amp doing at the start? It looks like an integrator but the signal form + and - should be the same and the + side is not grounded like an integrator would be.