Re: Pushing Neons (fwd)

---------- Forwarded message ----------
Date: Mon, 27 Jul 1998 10:31:43 PDT
From: Mad Coiler <tesla_coiler-at-hotmail-dot-com>
To: tesla-at-pupman-dot-com
Subject: Re: Pushing Neons (fwd)

>---------- Forwarded message ----------
>Date: Sat, 25 Jul 1998 17:53:00 -0600
>From: terryf-at-verinet-dot-com
>To: tesla-at-pupman-dot-com
>Subject: Pushing Neons

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

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