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High Voltage Projects

High Voltage Progects on experiments and projects can be extremely dangerous and shouldn't be attempted without a good working knowledge and understanding of the risks.

DRSSTC: To mimic the bigger coils out there dual resonant primary/secondary is the way forward. This complicates the design and, as always with Tesla Coils stresses the electronics. This design is based on the medium sized coil with a 150mm diameter secondary as before but with a larger number of turns and finer gauge wire. The overall length is also up to 660mm. This arrangement reduced the resonant frequency to around 100kHz for the bare coil. The top load reducing this to 80kHz. Lower frequencies seem to create longer arcs. To allow higher operating powers IGBT block modules are used. Not only are these designed to handle higher currents they also don't produce the hot shrapnel on failure that individual IGBTs tend to. However, they still fail and cost a lot more. At the moment, the coil is fitted with a 10A breaker so limiting the consumption to about 2kW. This energy should be good for 1m length sparks

VTTC Vacuum tube TC are one of my favourite designs. While not generally great for long arcs they can run in CW mode and are more forgiving in fault conditions. Their primaries run at higher voltage so pose a significant extra danger not that any Primary voltages are safer

HF HV suplies Small High voltage supplies are always useful for various experiments and having high frequency outputs makes for interesting experiments while keeping the power supply small.

High Voltage DC supplies Another useful powersupply is the DC HV and it is quite easy to make the HF AC supply into this with a Cockroft-Watlon multiplier. These power supplies will produce voltages in the order of 10 of thousands and are basically X-ray tube drivers .

Images are of a 60kV power supply based on a dental-head x-ray psu modified to give a variable output. This is an inverter style power supply with a full-wave CW multiplier stage output. A larger full-wave CW multiplier is also shown here. This part is for use in 8kHz X-ray supply. A Line Out Put Transformer is also shown with a HF driver. These are particularly nice as the can produce a HF HV directly from the secondary. These were commonly used in old valve TVs.

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