Re: 555 Timer program (fwd)

["Tesla list" <tesla@xxxxxxxxxx>]

---------- Forwarded message ----------
Date: Sat, 25 Aug 2007 08:14:53 -0700
From: Ed Phillips <evp@xxxxxxxxxxx>
To: Tesla list <tesla@xxxxxxxxxx>
Subject: Re: 555 Timer program (fwd)

Tesla list wrote:

>---------- Forwarded message ----------
>Date: Fri, 24 Aug 2007 14:26:42 -0500 (GMT-05:00)
>From: gary350@xxxxxxxxxxxxx
>To: Tesla list <tesla@xxxxxxxxxx>
>Subject: 555 Timer program
>
>I have an idea for a small Tesla Coil.  I need a 555 timer program does anyone have one or know here I can download one that really works.
>
>I use to have a 555 timer program on my old computer.  I could put in the values I want and it showed me a graph of the output wave same thing you could see on a scope.  
>
>What I am looking for is the resistor, capacitor, diode, values so output goes high for a very short time, as short as possible.  I want a spike output not a square wave.
>
>I did a search for 555 timer and 555 timer program found several but non of them actually work.  Several are must advertisements wanting me to buy software.
>
>My TTL book is not showing me what I need to know.
>
>Here is the plan.  I am going to connect the secondary coil of a small modulation transformer in series with the primary coil of the neon.  If I put a signal on the primary of the modulation transformer is should modulate the 120 VAC going into the neon.  The output of the neon should be modulated too.  Turn the dial change the frequency modulation see what happens.
>
>Anyone tried this already?
>
    Send me your address and I'll send you a zipped 555 timer design 
program that certainly works although the design equations in the 555 
data sheets work fine too and are easy to use.  As for your plans,  are 
you talking about working with a TC with spark gap?  That will screw up 
any attempts to generate tones.  Also, putting an audio frequency signal 
in series with the primary of the NST will just add it, not cause 
modulation of the 60 Hz power line voltage.  If the frequency is 
significantly higher than 60 Hz than not much of anything can happen 
because the leakage reactance of the transformer and the primary 
capacitor for the coil will form what amounts to a low pass filter and 
none of the higher voltage will appear across the spark gap to modulate 
its firing time.

Ed