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Registered Member #89
Joined: Thu Feb 09 2006, 02:40PM
Location: Zadar, Croatia
Posts: 3145
Looking around all the time now... I've just never actually seen an audio modulated coil doing big, I mean really big singing sparks. Everyone seems not to be able to do more than few cm sparks. I wonder if anyone will manage to break 1 foot mark... but I think not with the topology that is currently used.
The main problem apparently isn't hard switching, but the massive amount of reactive current you have in your primary - and exceeding your mosfet rating is to easy.
I was thinking about the hypothetical modluateable power converter (class D amp) which you could use to drive the coil in tune without need for FM modulation or hard switching.
Still, that would mean large piece of ferrite to process all the power, and still your SSTC switches would be very stressed.
Since there is no way you could get without a hard switched converter anyway, I thought there could be simpler way around:
- Some LARGE ferrite. Like this.
You build a normal coil, and use FM or PWM audio modulation; but, instead of your primary coil, you wind a step-up transformer onto the core and run it into magnifier mode, through base feed.
You will be hard switching, but current stress on your switches should be many times smaller and allow you to give out some real audio-modulated output.
Those inverter welders work well with hard switching and your circuit would now be nothing but one such an inverter with a resonator stuck onto end. You could get rid of all the control loop problems associated with class D amps.
I know it's a huge project, but you are definitely by far biggest candidate for something like that! Getting things like large ferrites and mosfets isn't a problem for you, so it depends on how much you like big audiomodulated sparks!
Awesome! Except one thing...... THAT SONG!!! !
Well... Where is that chrunching sound coming from?
Chris: To show the coil off.. I wondered if you could just play something very well known, neutral, classical and liked-by-all?
Maybe something like this?
Or you just wouldn't try to play anything classical at all?
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Small Bi-polar SSTC
