Re: LM567 Tone Decoder

• To: tesla-at-poodle.pupman-dot-com
• Subject: Re: LM567 Tone Decoder
• From: Tesla List <tesla-at-stic-dot-net>
• Date: Sat, 22 Mar 1997 00:03:38 -0600
• Approved: tesla-at-stic-dot-net

Subject: 
        Re: LM567 Tone Decoder
  Date: 
        21 Mar 97 04:47:09 EST
  From: 
        Alan Sharp <100624.504-at-compuserve-dot-com>
    To: 
        "INTERNET:tesla-at-pupman-dot-com" <tesla-at-pupman-dot-com>


>        You can't be serious, I built that...do you know what the
>problem
>is?  I can't get it to work either!  Could you send me the plans for a
>more
>traditional coil?

Has anyone got that circuit to work! I gave it up fairly quickly and
went on to something else - I blew the 567 its just not beefy enough
to drive the fet (IMHO).

I eventually used a ttl schmitt trigger oscillator, driving a ttl
monostable
(adjustable pulse lenght), driving a buffer chip, driving a irf540.
Now I would replace the ttl with a uc3524 pwm chip.

But be warned the solid state route is difficult at high
powers. I had much fewer headaches 18 years ago building a micro 
computer on strip board.

There is Rob's bridge circuit is on the net somewhere - there is
no reason why it could not be adapted to run at lower voltages
say 24v with a single pair of IRF540's (180v maximum).

By a traditional coil I meant neon transformers and spark gaps.
I'm just collecting the bits for mine.

have fun,

Alan Sharp

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