Re: [TCML] O.T.?Audio driven flyback.

[nancylavoie@xxxxxxxxxxx]

Oh well, have the 555 chip and the other components,just looking for an easy way out!Figured there was a catch.Thanks for your help. Wyatt
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-----Original Message-----
From: Scott Bogard <sdbogard@xxxxxxxxx>
Sender: tesla-bounces@xxxxxxxxxx
Date: Sat, 26 Jun 2010 13:20:25 
To: Tesla Coil Mailing List<tesla@xxxxxxxxxx>
Reply-To: Tesla Coil Mailing List <tesla@xxxxxxxxxx>
Subject: Re: [TCML] O.T.?Audio driven flyback.

No, it won't work.  You will not get any output out of the flyback 
because the frequency will be too low.  To get sound out of sparks, you 
need to drive the flyback at 100 kHz (way above the frequency of audible 
sound.  And that signal needs to be chopped up into chunks the size of 
sound waves...  So just like a TC, you hear the 120 Hz firing of the 
coil, and not the 100kHz of the arcs themselves.  What you need to do to 
keep things simple is to build your driver for 100kHz, and then feed an 
audio based PWM signal into the shutoff pin of your 100 kHz driver chip. 
  I don't know how to do this, but I suspect it isn't as difficult as it 
seems.  Perhaps a digital amplifier already does this and you can just 
plug your amp into the shutoff pin, but I doubt it is that simple!  Best 
of luck.

Scott Bogard.

On 6/26/2010 9:34 AM, nancylavoie@xxxxxxxxxxx wrote:
> Hi,hope this isn't too far off topic but I'll keep it short.While looking at circuits for audio driven flybacks I began to wonder if it would be at all possible to accomplish the same results with an off the shelf audio amplifier rather than rely on some of the seemingly touchy designs offered on the web?Couldn't I simply power the flybacks primary with the amps output (provided the wattage is sufficient)?I know this would take the fun out of building the unit,but I'm thinking perhaps a ready made amp would be more robust.Anyone have any idea? Thanks.  Wyatt
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