A work in progress, the Audio-Modulated, Solid-State Tesla Coil (mkI) will be exactly what it sounds like. It will be constructed exclusively from easy to find items for its support structures and a small order for some specialized solid-state components.
The final design, for audio clarity, will be desktop sized and able to produce clear music generated from its output arc to the open air. For testing purposes and to utilize the secondary coil that is already made, it is arroximately 4ft high.
(Temporary) Secondary Coil Specifications :
Diameter of secondary coil : 3.50in Winding height of secondary coil : 23.622in Wire diameter for secondary coil : 0.01in Spacing between windings : 0.00in Secondary turns : 2362.00 Secondary wire length : 2164.48ft Secondary inductance : 67.82mH Approximate resonant frequency : 208.25kHz Secondary quarter wavelength resonant frequency : 113.68kHz Secondary self capacitance : 8.61pF Toroid capacitance required to form quarter wavelength coil : 20.29pF
The signals produced by the oscillation circuit and the gate drive transformer, respectively
Views of the mock-up full-bridge setup when the gate drive transformer was being tested (view is in a rackmount computer case, which is for RF shielding). Note: pictured without the fans on the full-bridge
Past Updates :
| | UPDATE || 11 December 2007 | |:
According to the oscilloscope and the voltage observations, the audio SSTC with the Full-Bridge design is ready to be tested at full power. Once finals are over (this Thursday), the design shall be tested once and for all.
Currently, the audio source for the coil is restricted to placing some sort of portable audio player in the shielded enclosure with all the driving electronics, that is, until I finish the fiber optic link design. The transmitter and receiver setup for the fiber optic audio transmission is being put together on its protoboard, whereas the design can also be adapted for many other projects in the future - notably, 5Mbps data transfer and long-range laser communication. The electronics page will be updated accordingly when it is completed.
| | UPDATE || 1 December 2007 | |:
I am doing the oscilloscope work now, and just a quick note: withoutany signal matching feedback, the circuit is producing a steady 166kHz signal ... as you can see above, the resonant frequency of my secondary coil is 208.25kHz, which is within the 100kHz range for the circuit, so that will work fine.
I am also working on the gate-drive transformer, which was producing an amount of ringing and noise, but after readjusting the windings and separating the wires as they leave the core, the noise is now diminished. The next step is to remove windings to find the optimal output waveform under full load and check to be sure the mosfets are on/off in the right pattern, and then the coil will be ready for its test run.
| | UPDATE || 29 November 2007 | |:
The circuits are complete and in the enclosure. I ran a low-voltage test on the rackmount without the secondary coil, and none of the mosfets or anything exploded, so that's promising.
Tomorrow I will be acquiring an oscilloscope to check the design and tune the singal before I go forward with a complete run-up of the coil. This weekend will either be exciting or depressing.
| | UPDATE || 4 November 2007 | |:
All of the last of the components have been ordered - enough for two complete units (bi-polar configuration to come?)
Also, of note: I have designed and ordered the parts for a simple fiber optic connection to interface the audio source to the SSTC controls - capable of 5Mbps of transfer... after I get the parts in, set up my design and test it, I will post a separate page for the design of the fiber optic link, which is also capable of being adapted for use with an interruptor.
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Electronics Projects 
