Originally posted by fzzzy
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I have used a board operating at 8-9KHz which produced 300V spikes from just 24Vs, passed through a large hand wound inductor. I added an additional coil which did not overlap with the first (the toroid is 6.5" across). This additional coil was hooked up to it's own hexfet(rated at 800V, with a 7ns rise time, the dv/dt is critical). The induced spikes from the 2 coils were shunted through to a current free section of circuit (capacitor filtered) as per Tesla's hf current circuits, and on this side the oscilloscope showed a 600v spike. The individual spikes were timed perfectly to create a standing wave.
I have attempted to find other fets, or other solid state switching components to permit spikes up to 20KV and higher but have had no luck. The higher voltage rating is necessary to obtain the bare minimum specifications recommended by Tesla in Patent # 454,622 for useful lighting (15KHz @ 20KV). Again, I am self-trained so I am concerned that I may have overlooked some other modern component systems. But if not, then the best approach to meet those goals is as cited in Tesla's patent.
I have carbon welding rods which I plan on tapping and attaching screws into, as a spark gap. I may stick with homemade mylar/aluminum capacitors as I can not afford some nice big caps. But ultimately I will build the capacitors which Tesla invented that I have seen no one else build, and he specifically states that they are GREATLY suited to circuits with high frequency (make note of this patent gentlemen). It is patent 567,818. It appears to be something that can be made cheaply so people working with HF circuits should ditch what they are using and make these. If I remember correctly it was Tesla's last major condensor patent. This should not be overlooked!
My other concern is the primary and secondary. I recently bought 4gauge bare copper for the primary. I have 32gauge magnet wire which will be used for the secondary. I plan on making the secondary in a pancake fashion. I'm still determining if I should use Tesla's 512,340, magneto-coil. The only concern is that he specifically mentions AC voltage regarding it at the beginning.
Are there any other people looking into this line of patents by Tesla? If so, can you comment on them?
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