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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
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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