Tesla coil in a briefcase. This is my latest easily portable mini coil which gives 2-3 inch sparks. These are great fun and are generally safe due to the low power.
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A working HeNe tube is shown below running at 2 kV with a 330 kohm resistor. It takes about 3 – 4 kV to trigger. It is shown firing through a 15,000 lines per inch diffraction grating and shows the first order spectra.
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I have held regular Home Open Days where I did demonstrations for people by invitation.
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