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Registered Member #3862
Joined: Wed May 04 2011, 03:04AM
Location:
Posts: 5
Hi guys, I'm building an audio modulated SSTC for my 4th year engineering project at uni and had a question regarding PRF modulation. I've read from steve4hv's site that by making the coil fire 440 times a second will produce the note A, how does the coil operate at resonant frequency if the FET's are only being triggered 440 times a second? Or am I understanding it completely wrong?
Registered Member #1875
Joined: Sun Dec 21 2008, 06:36PM
Location:
Posts: 635
The FETs operate at the coil's resonant frequency that is too high to hear. You interrupt it on top of that at a frequency you can hear, so you get a frequency within a frequency, but you only hear the low one that you can control.
Registered Member #3610
Joined: Thu Jan 13 2011, 03:29AM
Location: Seattle, WA
Posts: 506
Look at Steve Ward's SSTC5, there are others but that is a very simple and straightforward circuit. The interruptor is an oscillator based on a 555 that toggles the enable pins on the mosfet gate driver ICs. The resulting output is bursts of resonant frequency square waves occurring at a much lower frequency. It's effectively very similar to switching power to the whole coil off and on rapidly.
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Musical Tesla Coil PRF Modulation
