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  1. E

    Tesla coil driver revisited.

    The extra diodes are to protect the transistor and reduce its heating. The potentiometer and feeding resistor are low to allow the transistor gate to discharge better because of the gates capacitance (~ 5000pF), something I had read about. Positive feedback from the Tesla secondary coil makes it...
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    Tesla coil driver revisited.

    The above circuit is a working Tesla coil driver. It could use being optimized though. I am trying to choose the best mosfet for maximum output. My schematic editor is limited and that’s the best I was able to do. Any comments?
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    Tesla coil driver revisited.

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    Tesla coil driver mosfet problems.

    If you don't have anything useful to say why are you here? Did you read the entire thread. We are talking about the latest schematic. If you read the entire thread I wouldn't have to repeat myself endlessly. My schematic editor is limited and may be faulty. I'm not impressed by your "expertise".
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    Tesla coil driver mosfet problems.

    Can you show a schematic of what you propose? Thank you.
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    Tesla coil driver mosfet problems.

    Could this work?
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    Tesla coil driver mosfet problems.

  8. E

    Tesla coil driver mosfet problems.

    I see what your saying about the ten zener. Can the internal diode handle the inductive spike current? Will the zeners react fast enough to handle any voltage spikes above 400 volts? This is more or less a "snubber" circuit isn't it? Are you talking about a class c amplifier? Thanks to...
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    Tesla coil driver mosfet problems.

    Can anybody here help me?
  10. E

    Tesla coil driver mosfet problems.

    The diodes are cheap although bulky. My schematic editor won't let me post the entirety of the proposed circuit. I was hoping to get an educated opinion about if this will protect the mosfet sufficiently.
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    Tesla coil driver mosfet problems.

  12. E

    Tesla coil driver mosfet problems.

    The primary is 4 turns 12 gauge copper wire close wound on a 6 inch diameter pvc pipe joint fitting. The secondary is 860 turns 22 gauge magnet wire on a 2.25 diameter pvc pipe. It is air core. All the designs are my own. At 30v and with a 300 ohm resistor replacing the 700 ohm resistor it...
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    Tesla coil driver mosfet problems.

    I was unable to upload a photo of the Tesla coil.
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    Tesla coil driver mosfet problems.

  15. E

    Tesla coil driver mosfet problems.

    Sorry my schematic editor is limited in what it can do. The design is subject to change. I missed the transformer ratio entry on my second attempt. I don't know the particulars of all the parts, they were from many different sources. I have a limited budget and don't have a digital...
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    Tesla coil driver mosfet problems.

    I have a zener diode to limit gate voltage, sorry not shown in the schematic. I think the voltage across the drain-source goes to high and exceeds the rating of the mosfet, 500v. It's a irfp450a. I could be exceeding the mosfet power dissipation rating also. I was thinking of using hv zener...
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    Tesla coil driver mosfet problems.

    Whoops, I put the diodes upside down and a ground is missing. Other problems? Do you need a revised schematic?
  18. E

    Tesla coil driver mosfet problems.

    The above circuit quickly frys mosfets at 60v power supply. At 30v and with a 300 ohm resistor replacing the 700 ohm resistor, it works well. Help please.
  19. E

    Tesla coil driver mosfet problems.

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