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Re: Pushing Neons (fwd)



---------- Forwarded message ----------
Date: Tue, 28 Jul 1998 21:05:45 -0600
From: terryf-at-verinet-dot-com
To: Tesla List <tesla-at-pupman-dot-com>
Subject: Re: Pushing Neons (fwd)



Hi Tristan,
	Thanks for the info.  Your setup is resonating the neon's output with the
primary caps allowing the voltage and current to run at higher levels than
the neon would normally supply.  Since neons are made for all weather use
they are actually very tough.  I am trying to get the same high energy out
of them with much less stress.  The fact that you and many others can run at
these stress levels is great.  Do be sure to use safety gaps.  I don't think
there is too much danger from overheating but the high voltage is a real
concern.  The voltage can instantly kill the neon while the current takes
some real abuse to do damage.

        Terry Fritz


At 08:56 PM 7/27/98 -0600, you wrote:
>From: Mad Coiler <tesla_coiler-at-hotmail-dot-com>
>To: tesla-at-pupman-dot-com
>Subject: Re: Pushing Neons (fwd)
>
>
>Terry, and list,
>
>Just though I would mention a few things about the NST setup I have been 
>using. On my smaller coils I have been using a 12kV 60mA, with a 
>somewhat matched primary capacitor - around 11nF. On one small coil, 
>with the input variac at about 50% I have measured 7A strait out of the 
>wall. Also, at full power(140V input) the NST puts out about 150mA. I 
>have let it run for a few minuts an a time and seems to be fine. I 
>wonder if high freq tank pulses could be affecting the reading on my 
>ampmeter - since I am not using any filters. I might try and see if 
>using filters affects any of these values.
>
>Tristan Stewart
>


>>Hi All,
>>        I have been playing with a high performance charging circuit 
>design
>>that uses a 15kV 60 mA neon transformer.  I have the design ironed out 
>so
>>that when the input voltage is 120 volts, the current is about 8 amps.  
>The
>>output voltage is 15kV and the current is 60 mA (all RMS values).  This 
>is
>>charging a 20nF cap to 21 kV peak.  So everything is within 
>specifications
>>of the components.  
>>
>>        The first problem is when the gap fails to fire or you are 
>turning
>>up the variac and the gap hasn't fired yet.  Without the gap firing, 
>the
>>neon's input current is 20 amps.  The output voltage is still 15kV but 
>the
>>output current is 115mA.  These levels would be maintained only a short
>>period of time (several seconds).
>>
>>        The second concern is that there can be turn-on transients of 
>30
>>amps peak (only one cycle) on the input.  The output may see a 250mA 
>peak
>>for one cycle and a 35 kV output peak. 
>>
>>        The output transients don't worry me because the gap (or safety 
>gap
>>or transorbs) will fire and the system will startup.  The voltage and 
>the
>>current spike is only for one cycle.  Also this transient case is 
>rather
>>unlikely to occur often.  I am more concerned about the first case 
>where
>>high input and output currents my be sustained for several seconds.
>>
>>        My question to those that have "been intimate" with the 
>internal
>>parts of neon's is do you think these short term over currents will do 
>any
>>harm?  
>>
>>Thanks,
>>
>>        Terry Fritz
>>
>>        terryf-at-verinet-dot-com
>>
>>
>
>
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