On Thu, 03 Jul 2008 08:57:48 -0700, Don Bowey <dbowey@[EMAIL PROTECTED]
>
wrote:
>On 7/3/08 7:53 AM, in article 8spp64hncghn88d0gqbensnerupo39h4k0@[EMAIL PROTECTED]
>"John Fields" <jfields@[EMAIL PROTECTED]
> wrote:
>
>> On Wed, 02 Jul 2008 22:44:53 -0700, Don Bowey <dbowey@[EMAIL PROTECTED]
>
>> wrote:
>>> Perhaps you could post a link that plots the negative resistance
region of
>>> a neon lamp?
>>
>> ---
>> news:lnpp64t1q9ohk1d1ar57dhd673pmaif3g6@[EMAIL PROTECTED]
>>
>> JF
>
>Thanks.
>
>I had already thought more about the neon lamp and decided it could have,
or
>appear to have, a negative resistance region, so I did some google work
and
>found several trustworthy articles sup****ting it. I also found one
credible
>article saying the effect is not negative resistance, but...... If it
quacks
>like a duck it's probably a duck.
>
>IMHO the typical neon tube relaxation "oscillator" does not use that
effect,
>however, but uses the gross cap discharge to begin a next charge cycle.
---
I agree, and stated that in an earlier post. :-)
---
>The external R must be high enough to allow the voltage across the tube
to fall
>far enough to extinguish the lamp.
---
Yes, and when the gas in the tube deionizes to the point where current
through it falls to a low enough level, the "striking voltage" must
then be raised high enough to once again start the ionization.
---
>This will be a good slow-day plaything. I think I'll put a parallel
>resonant circuit in series with the lamp and variable voltage
source.......
---
Sounds like fun. :-)
If you want to you can go here:
http://www.duntemann.com/12vtubes/datasheetsindex.htm
and download all 80 megabytes (!) of the GE glow lamp manual.
JF
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