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    AMRobin's Avatar
    AMRobin Posts: 6, Reputation: 1
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    #1

    Feb 4, 2019, 11:59 AM
    Tesla coil
    Someone Please Help!

    I have been watching dozens of videos on creating a mini Tesla Coil. Trying to help/teach 12yr old for up coming science project.

    For the life of me I just cant get it to function. I have tried many setups regarding the resistor, transistor, primary and 2ndary coil. Had TIP31 and 47K with 9v, that didn't work.

    Currently have approx. 610 winds on 2ndary (on 2" pvc). Have 7 on primary "in same direction as 2ndary", switched it from 3 to 7 to see if that works. Using 2N2222A and 10k. Using 12v (8 AA battery setup)

    I found an approx. 8.3 to 8.5 fluctuation in current between main switch and Collector. Found 9.4 between Collector and Emitter. Transistor was slightly hot to touch, which is probably the plateau current not switching fast enough.

    What am I missing, the electrically challenged person that I am? Is it the coil setup? The input voltage? I am clueless!
    talaniman's Avatar
    talaniman Posts: 53,912, Reputation: 10852
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    #2

    Feb 4, 2019, 12:11 PM
    Please show the instructions you followed.
    AMRobin's Avatar
    AMRobin Posts: 6, Reputation: 1
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    #3

    Feb 4, 2019, 01:07 PM
    No top load yet, trying to get it working.
    Switch is basic two pole.

    Bottom wire from 2ndary Coil and one end if resistor to Base
    Negative from battery to Emitter
    Top lead from Primary Coil to Collector
    Bottom lead from PC and other end of resistor to Switch
    Positive from battery to Switch
    talaniman's Avatar
    talaniman Posts: 53,912, Reputation: 10852
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    #4

    Feb 5, 2019, 08:00 AM
    How to make a mini Tesla coil | Crazy invent

    Review you connections.
    AMRobin's Avatar
    AMRobin Posts: 6, Reputation: 1
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    #5

    Feb 5, 2019, 08:49 AM
    Connections are fine. Im thinking more of impedance matter given coil size, but I don't know how to solve that. Are you electrical eng. Or enthusiast? I need a pro!
    talaniman's Avatar
    talaniman Posts: 53,912, Reputation: 10852
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    #6

    Feb 6, 2019, 05:09 AM
    I don't get paid to solve problems any more, but what you used to build your coil is crucial, and the way it's assembled is too. For one old wire for the winding can arc or short, and your resisters may not be properly rated. And overheating your solder will ruin the integrity of your connections. Small things it may seem but humor me with your parts list so we can check the specks.

    Hope this article helps it's quite a read. Lots of math.

    Tuning a Tesla coil

    http://weber.itn.liu.se/~stegu/onete...uide_draft.pdf

    That's why I inquired as to which instruction you used to get the specific type TC you are making. At least tell me where you got your parts. A link or book/magazine will suffice.
    AMRobin's Avatar
    AMRobin Posts: 6, Reputation: 1
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    #7

    Feb 6, 2019, 12:38 PM
    AH, now we getting somewhere... lol What you mentioned about overheating solder... thats a new one one me. Makes me wonder.

    This is what I have been working with.

    26 awg magnetic

    Radio Shack - TIP31C, 47k 1/2 watt, 27k 1/4w and 33k 1/2w

    Stern - 10k 1/2w

    Farhop - 2n2222a

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    talaniman's Avatar
    talaniman Posts: 53,912, Reputation: 10852
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    #8

    Feb 7, 2019, 06:21 AM
    Thanks guy the pics bring some clarity, but if I can have the assembly instruction source, and whether you used a mother board or direct soldered connections for your components. I lean toward a short in the winding of the secondary coil that is disrupting the magnetic field output. What are you using as a verification of function a light bulb? If so what size?

    Is that a glitch in your first photo of the copper wire winding of the pvc pipe?
    AMRobin's Avatar
    AMRobin Posts: 6, Reputation: 1
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    #9

    Feb 7, 2019, 09:39 AM
    I soldered additional copper wire to make larger coil. I tested with multi-meter, no break. The vlog you suggested is the wiring scheme I used. Been using CFL bulb to test.

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