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New Lab, Family Coil, 1st Light
Original poster: "by way of Terry Fritz <twftesla-at-uswest-dot-net>" <Mddeming-at-aol-dot-com>
It finally happened- First light on new coil with help from grandsons (ages
8.8, &12) in new lab (1918 vintage brick garage). Since I've said a lot
recently about lack of adequate data from some corners to allow peer review,
here's the full specs:
( Pix to follow whenever I get a decent camera and a web site.)
Power supply 20A 0-120 Variac, 15A RFI filter, 15 A fused. Input I and E
PFC 92.4 uf -at- 660VAC (6 nominal 15's in parallel). Transformer 15/60
unmodified Transco in original case. "Terry-style" NST protection filter w/
#10 welder's face plate over the safety gap to reduce UV blindness. Gaps set
-at- 0.35" each. Main gap aspirated 1/2" copper and PVC pipe fittings across
outlet of filter, set -at- 0.4" connected to Sears 10A Shop Vac. via 2" x 8'
Hose and assorted fittings. Tank Cap 18.2 nF ,35 kV rolled poly Cap with real
transformer oil. Primary 0.25" Cu tubing on 0.75" c-c 12T tapped -at- 7T. Base
0.25" acrylic over particle board and PVC pipe. Primary support 28" x 0.25"
Lexan doughnut 5" ID. Secondary 820T AWG#23 magnet wire.
Dual toroid Terminated Coil. Ground via #8 grounding cable to 3/8" x 4' Cu
rod driven 3' 8" into garage floor.
Ceiling Distance = 96.0
Wall Distance = 48.0
Primary Height (Inner Turn) = 21.5
Primary Inner Diameter = 6.375
Primary Outer Diameter = 24.375
Primary Height (Outer Turn) = 21.5
Strike Rail Height = 25.0
Strike Rail Diameter = 30.0
Secondary Base Height = 25.0
Secondary Diameter = 4.28
Secondary Length = 21.16
Secondary Inductance (mH) = 13.76
Terminal-1 Height (center) = 51.8
Terminal-1 Cord Diameter = 3.25 (4 Galv. vent elbows)
Terminal-1 C-C Diameter (toroid only)= 8.0
Terminal-2 Height (center) = 55.4
Terminal-2 Cord Diameter = 4.25 (Al flex without tape over.)
Terminal-2 C-C Diameter (toroid only)= 13.75
Top Voltage = 360000
Pass Ccalc (pF) Change Fcalc (Hz)
28000 C=24.66628 Err%=0.000056 F=273186.38
Performance: with no breakout point.
Measured frequency 258.3 KHz (MotorolaService Monitor)
Max. measured horizontal air streamer 31". Discharge to overhead grounded 3"
copper ball = 28" white arc. No primary strikes.
Not too bad for an old guy and 3 kids.
1. Add storage area & instrument racks to Lab.
2. On the fly adjustable height Primary
3. 1/7 HP phase adjustable SRSG,
4. 30A Variac
5. Assemble 15/300mA NST farm, add Maxwells to Tank.
6. 8" coil.
7. 40A and 15 A power lines to Lab.
8. KVA Generator
10. File Bankruptcy etc.etc. ;-))
Query: If running 2 matched Maxwells in series, is there any
advantage/disadvantage to putting one on each leg with primary between them?
Cheers from the Deming Family Tesla Society:
(Matt D. Ricky D. Matt D. II Elton D.)