~     BELLEND LAB'S HIGH VOLTAGE PAGE.     ~



                     WE BODGE.    WE DRINK TEA.      WE GET PAINFUL SHOCKS.



DANGEROUS SHIT ALERT!   MOST OF THE STUFF ON THIS PAGE WILL ATTEMPT TO KILL YOU!

                                           DOCTOR BELLEND IS AN EXPERIENCED BODGER. DON'T ATTEMPT TO BUILD ANY OF THESE MACHINES.



A TESLA COIL BUILT IN A FEW HOURS FROM JUNK, AND REQUIRING 5 CUPS OF TEA.
  • Proin s

  • Introduction.

    Warning....

    First of all, this is just something you bodge to make big sparks for a day. Please don't
    make it your entire life like Peter Terren the sad pen collector. I'm sure you have much
    better things that you like to do, like a social life, fast cars, beer and chasing the fairer sex...


    At the turn of the century Nikola Tesla invented a high frequency air-cored transformer
    with the aim of transmitting electricity without wires. He carried out many successful
    experiments, but it never came to fruition. Since then geeks have built small coils based
    on neon sign transformers. However the web changed all that, and fellow geeks could
    share the results of their experiments and pretty soon sites were showing big coils ablaze
    in a mass of sparks.

    All over the web, anoraks are devoting their lives to building high voltage stuff. It's no big
    deal. We built this in hours, out of junk and it works fine. If you're looking for polished brass
    parts and expertly machined components though, you're looking at the wrong site.

    Remember also that the size of your Tesla coil is inversely proportional to the extent of
    your social life, the people with time to build and run ten-foot coils are people who don't
    let a social life get in the way. Either they're single, with facial hair, and wear Apple tee-shirts
    and sandals or they have partners who don't care if they aren't around. If I spent weeks in my
    workshop building 10 foot Tesla coils I'd be divorced and probably end up living on
    Pot-Noodles, wearing the aforementioned Apple tee-shirt, growing facial hair and looking
    at a lot of internet pornography. This page shows you how you can build a coil out of junk
    in a few hours.

    The coil below was built without the use of a calculator, oscilloscope, resonance formulas
    or any other unnecessary rubbish.

    Ingredients: 4 microwave oven transformers, (from old microwaves please), capacitors
    (Maplin or RS), car brake pipe (Dirty Barry's car parts), various plumbing bits (B&Q),
    transformer wire (Maplin or RS), Variac or old convector heater for ballast. A fast motor
    from a Hoover/Strimmer and access to lots of assorted electrical junk.

    Building a Tesla Coil...
     
    Tesla coil on test in the garden recently after standing for a few years.    
    Then.... A massive failure of the RSG and a full power arc burn-up ensues.

    Never mind, the RSG needed a redesign anyway!  :-)
     
    Tesla coil innards....

    Power supply. 4 X microwave oven transformers wired in series-parallel to give 8000 Volts
    @ 0.5 Amp full power. These must be current limited so they are supplied
    from a variac. The 2 outer transformers are stressed to 8X their normal voltage between
    core and primary so the whole thing is dumped in transformer oil. Don't use engine oil,
    we tested some and it was rubbish (water would probably have been better).                                 

    I can't stress enough that the output from this is absolutely LETHAL.
     
    Capacitor. 10 X 0.033uF @ 20 Kv  in series in a piece of pipe giving 33nF at 20Kv
    Rotary spark gap. My first one exploded at 10,000 rpm and had to be extracted
    from the garage ceiling. This one is built from plexiglass I scrounged from a
    mental health ward, and runs slower for safety!
    Specially dedicated supply that won't trip out our entire house!


    The input current must always be limited to Microwave transformers because
    you are basically placing a short across them. I use this ancient Variac.
    It's a rotary transformer giving 0-240 volts into the 8Kv primary power supply.
    First run on a 300w neon transformer. Even this gives sparks a foot long.
    It is way out of tune in this photo. 
    Coil at about 70% power which is as much as I dare in the garage.
    The longest sparks were 5 foot!
    This is what you can achieve if you have lots of money and a very understanding wife!
    Mr Tesla himself. An electrical genius. Seen here in his Colorado Springs lab in 1899.
    See the Tesla coil in action. Click there -  http://www.youtube.com/watch?v=EaX_hyyG35o

     
       



    CLIMBING ARC - AS SEEN IN FRANKENSTEIN'S LAB
     
       
    Some people call them 'Jacob's Ladders' but I think Jacob should be
    left to the God-botherers, it's a climbing arc as far as I'm concerned.
    I've had to call it a Jacob's Ladder on U-Tube however  because everyone
    else does. The proper name, if you're an engineer is a 'Horn Gap Electrode'.
    They were originally used for breaking arcs in surge arrestors on early overhead
    lines.


    My first attempts were using my 4 MOT supply despite warnings from
    people all over the web not to use them because they're lethal.
    (We play with these things precisely for that reason). They didn't

    work well. Lots of current but not really enough voltage.
    The transformer. 120 Volts in 35,000 Volts out, air insulated.
    It's very difficult in the UK to source anything bigger than a 10Kv NST.
    Something like this is a rare find.


    Running your climbing arc at 50 Hz also means you get that classic
    'Frankenstein' sound unlike flyback and ignition coil driven gaps which can be silent..


    Climbing Arc. Done. See the Climbing arc in action:

    http://www.youtube.com/watch?v=TcowS9c2Uz4





    'FOOLISH STUFF NOT TO ATTEMPT.....' 
     
       
    With the Tesla coil at a mere 150,000 volts it is possible to discharge it through your
    body with relatively little pain.



    See me get a big electric shock:  http://uk.youtube.com/watch?v=6nZ45xgzl80


    And if you're really stupid, you could attempt grabbing the UK mains at 240 v.
    DON'T TRY ANYTHING YOU SEE HERE.
    THE DOC IS A BELLEND.
     
       
       
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