Re: Mini Audio modulated self resonant SSTC

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Original poster: dhmccauley-at-spacecatlighting-dot-com 


Check out my PlasmaSonic schematics at www.easternvoltageresearch-dot-com
Everything you need to know including complete instruction manual.

Audio goes into Pin4, deadtime compare.  You can use the error amps as well,
but it requires just a bit more components and thinking.
Couple audio in Pin4 via coupling capacitor.  Input audio should be high
impedance (i.e. 10k) from a CD player etc...
Set DC bias on Pin4 to start at middle duty cycle.  The audio will then vary
this duty cycle accordingly.

Push-pull mode seems to work best with the TL494 for audio modulation.  I've
tried single-ended, but i just get much better results in push-pull.

dan


 > Hello Group, and fellow SSTC'ers:
 >
 > Last night I built the miniature IGBT H-bridge and wound the gate drive
 > transformer for my MAMSRSSTC (Mini Audio Modulated Self Resonant SSTC
 > ;-)))  Anyway, I am not doing true self resonant audio modulation, there
is
 > going to be a TL494 on the input to the comparator via a switch, you flick
 > the switch on, and it overrides the feedback from the antenna, allowing
the
 > TL494 to control the coil.  I will have the TL494 set up to take in audio
 > and have a variable duty cycle/frequency.  My question is, how do I set
the
 > TL494 up for audio modulation?  It shows no schematics at Richie's
website...
 >
 > A crappy picture,
 >
<http://www.hot-streamer-dot-com/electrontube/DSC01221.jpg>www.hot-streamer-dot-com/
electrontube/DSC01221.jpg
 >
 >
 >
 > Regards - Jim Mitchell
 >
 >
 >
 >
 >