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A small TeslaCoil fully made of acrylic plastic. The cool thing about this is that every part is transparent. This coil is driven by the power supply of my large DC Teslacoil. Total height 44cm, max output voltage +- 380.000 Volts (57cm arc length). |
The rotary spark gap is placed underneath the coil, so the light will reflect in the base of the coil. As you might notice, there is no earth strike ring above the primary coil. I did not make it because I thought it simply wasn’t necessary, lets jus say the results outperformed my expectations.
Specifications:
Top load:
Steel sphere 120mm diameter chromed
Capacity 13,466 pF
Secondary coil:
50mm acrylic tube
0,24mm wire
1000 turns
157.1 m wire length
9373,83 uH inductivity
3,715pF self capacitance
¼λ frequency = 477,1 kHz
Resonance frequency = 396,6 kHz
Primary coil:
15,5 uH inductivity
3,0 mm copper wire
10 turns at 20 degrees angle
15mm clearance to secondary
Tank capacitor:
10,4 nF ideal
10,0 nF 30kV used
Capacitor type: 40x polypropylene pulse capacitors 100nF 1500V
Composed capacitor, made out of 2 strings parallel with 20 in series
Output:
57cm arc to ground
Approximately 380kV (Using the KEMA table, impulse voltage, spike to spike)
Power supply:
+6 and -6 kVDC (12kV total) (Voltage doubler)
2.2kVA 4800V transformer
1200W usage with coil on max power
35H choke coil
Schematics and equations:
Construction pictures:
Comments
Tapping on a primary coil means that you can tune the primary circuit by moving the connections on the primary coil. For example: if you have a 10 turn primary, but you connect it at the 9th or 8th turn (reducing its inductivity), this means that the primary resonance capistance is changing as well, this could be useful to tune your system.
You can find a MOT in every microwave, you might look at the internet for broken microwaves, the transformer is usually still working fine. NST are more difficult to get, you might ask a neon sign company if they have old transformers left.
the schematics on this page are accurate.
the contacts are 4mm wolfram rods and the used variac is 270V/20A. A 10Amp variac would also do the job.