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Registered Member #8817
Joined: Mon Dec 17 2012, 05:16AM
Location: Australia
Posts: 110
G'day,
Im Mitch from Australia, ive built 2x DRSSTCs, a PLL Audio SSTC, a normal SSTC and just recently a SGTC.
Now i want to pursue a bipolar tesla coil.
I need some advice;
Should i wind the secondary so i have a ground in the middle? or have it as one complete winding that is not grounded at all?
How do you measure the Fo of the secondary of a bipolar tesla coil that is not grounded? Ive done some reading on non grounded secondary's with this thing called ground reflection and 1/4 wave and 1/2 wave.
what coupling range should i be aim to be in? 0.1k - 0.2k? higher or lower?
Does JAVATC work with bipolar tesla coil principals?
Registered Member #15
Joined: Thu Feb 02 2006, 01:11PM
Location:
Posts: 3068
That's a great question. I've always treated bipolar coils just as two 1/4 wave resonators (two conventional tesla coils) built back to back sharing a single primary.
I actually did experiement with a few bipolar DRSSTCs. For the primary, I used a pancake primary - the same as with any DRSSTC, except the secondary coil was built as a 1/2 wave resonator, or a resonator that has roughly 1/2 the resonant frequency as a single 1/4 wave resonator.
I've done both ungrounded and grounded bipolar coils, and have found that grounded secondaries are a bit more unforgiving in that you will ensure that voltage peaks are not at the middle which could be very bad with regard to flash-overs etc...
Registered Member #8817
Joined: Mon Dec 17 2012, 05:16AM
Location: Australia
Posts: 110
Wow thanks Dr. Spark, ive watched all of your video's and been over your website many times your coils are excellent! :)
Yes like that with keyboard or guitar or from your PC, ive written over 40 midi songs to be tesla coil playable and have ~50 other songs from other tesla coilers.
is the diagram below how i would measure the secondary resonance of a ungrounded bipolar tesla coil?
Registered Member #8817
Joined: Mon Dec 17 2012, 05:16AM
Location: Australia
Posts: 110
Oh ok sweet, do i attach the leads to the side loads? or have them near the side loads? wont the meter leads add capacitance to the system and fudge the readings?
made a clean version of the diagram you drew:
the board im gunna be using has only 60A IGBT's so ill use more turns on the primary.
Hehe nice why do they require significantly less power than other coils?
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Advice on building a Bipolar DRSSTC
