Special Notes

The tap lead is shown being 3 feet long, enough to wrap itself around the primary coil assembly, provid­ing an additional turn. You may shorten this lead to a shorter length, bearing in mind that it will require readjustment, as it is pait of the primary coil.

If you cannot obtain open-air discharges of 10 to 12 inches, it will be necessary to experiment with the tap position along with the spark gap spacing. Open — air discharges are where the sparks emit from the output terminal into the open air. These will be longer than if they were dircct to a discharge probe. Point-to-point discharge lengths of 7 to 10 inches are possible and will he more intense but shorter than the open-air discharges.

The spark gap should be set to a maximum length where reliable operation occurs without extinguish­ing. The coil should not be operated for periods over 30 seconds due to radio frequency interface (RF1) potentials and overheating. You may have to place the system in a Faraday cage as shown on our plans as #FARAl. This will be necessary around sensitive electronic and communications equipment.

The secondary coil leads must never be allowed to route inside the coil form, as breakdown and irre­versible damage will occur (see Figure 14-3). Figure 14-4 shows a wooden block with leads secured.

Note the coil is referenced TOP and BOTTOM, where one end is slightly spaced shorter than the other. The shop unit seems to work best with the short end at the bottom. Coupling between the coils is critical and you may experiment by placing the sec­ondary coil on wooden blocks with various thick­nesses and check the results. A toroid terminal is recommended for optimum performance and you may use metal bowls.

Rpplication and Operation

Please note this Tesla coil device produces electro­magnetic radiation that can damage or interfere with certain types of equipment. Operation inside a screen room or Faraday cage may be required for FCC com­pliance.

1. Mote that only holes shown dimensioned must be precise Others may be eyeballed. 2 Corner holes are 1/4” and are located 1/2" from edges.

3. Use small pilot holes for #6 wood screws for securing the four ВКРС1 brackets.

4. Dimensioned holes are referenced from exact center

Figure 14-9 TPLATE1 fabrication

As stated previously, remove the power cord before making any of the following adjustments. The tap lead when ungrounded from the primary is a shock hazard and can produce 23 milliamperes to ground.

Optimum output requires the proper selection of the correct tap position on the primary coil. Start at the end of the outermost turn and reconnect the tap to the exposed sections, changing a quarter of a turn at a time while noting the increasing or decreasing output. You may secure it via soldering when the proper position is determined. Caution: Keep this

lead flat, as breakdown to the secondary will perma­nently damage the windings. Note the tap lead clip position and mark it when using different terminals. Note Figure 14-17 for proper routing of the tap lead, which we found tuned reasonably close with this ter­minal.

The capacitance of the output terminal will greatly affect the tuning, requiring more turns the larger the terminal size and vice versa. To operate the coil, you need to perform the following steps:

1. Place the coil on a table away from sensitive electronic equipment. Computers must be

Special Notes


Use 3/8" to 1/2" plywood

1 Corner holes are 1/4" and mate to those on TPLATE1 in Figure 14-9.

2. Tnal-position referenced subassemblies as shown and mark hole locations for drilling 1/8" clearance holes.

Figure 14-10 Fabrication ofBFLATEl

removed from the area and disconnected from power if on the same line. Observe, read, and heed all warning labels.

Make sure the switch is “off” on the front panel before plugging the coil into a three — wire grounded outlet. Defeating the ground on the plug will result in system failure, poten­tial fire, and an extreme shock hazard.

Attach the secondary coil as shown in Figure

14- 3. Make sure that leads from the coil are as short as possible, allowing only what is neces­sary to make the connections to the bottom grounding screw and repeating for the top ter­minal. Failure to do this will result in irre­versible damage to the coil.

The spark gap can be increased just before reliable firing becomes a problem. Further spacing may produce intermittently longer discharges but may overstress the capacitor and transformer. Always set for a reliable, steady firing of continued operation. It is a good idea to space the gap at 4s of an inch when first firing up, and increase as described previously.

Figure 14-11 Isometric view of CBKTASSY capacitor bracket assembly

Assemble as shown and verify proper alignment of tungsten electrodes. Preset gap to 1/4′ and secure with lock nuts.

Special Notes

Figure 14-12 ISO view ofSGAPASSY spark gap assembly

Special Notes

Figure 14-13 Bottom plate assembly

The secondary coil should be terminated into a conductive object such as a sphere or torus A metal 13- to 16-ounce coffee can or salad bowl may also be used with reasonable results.

5. The trick now is to adjust the tap lead for the maximum spark output from the particular terminal used. Note the lead position along

with the spark output of the secondary coil: the discharge length increases or decreases as adjustments are made. Note that a variance of several inches along the primary coil winding can make a noticeable difference in output. The open-air discharges will be longer than the point-to-point ones.

Special Notes

To safety probe. Use 36" WR12

LUGS may be replaced by forming circular loops at the lead ends and securing under the screw and nuts using flat washers. If using stranded wire, always pre-tin before forming to keep intact.

Figure 14-14 Bottom plate high-voltage wiring

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