Re: Light Bulb Experiment (ala Brent Turner)

To: tesla-at-pupman-dot-com
Subject: Re: Light Bulb Experiment (ala Brent Turner)
From: open_minded <bturner-at-apc-dot-net>
Date: Mon, 23 Sep 1996 12:36:39 -0700

Tesla List wrote:
> 
> >From jim.fosse-at-bdt-dot-comSat Sep 21 22:15:40 1996
> Date: Sat, 21 Sep 1996 20:20:25 GMT
> From: Jim Fosse <jim.fosse-at-bdt-dot-com>
> To: tesla-at-pupman-dot-com
> Subject: Re: Light Bulb Experiment (ala Brent Turner)
> 
> >Date: Fri, 20 Sep 1996 01:47:33 -0700
> >From: open_minded <bturner-at-apc-dot-net>
> >To: tesla-at-pupman-dot-com
> >Subject: Re: Light Bulb Experiment (ala Brent Turner)

<<SNIP>>

> 
> Sorry Brent,
>         Tungsten has a very strong positive temp. coefficient. It's
> this strong increase in resistance with temperature (power) that is
> used to stabilize the loop gain of a Wein bridge oscillator at 1.
> This prevents the oscillation from growing in magnitude and distorting
> the output sine wave as the amplifier exceeds it's linear range.
> 
>         jim


OK. I didn't remember the specifics, only that the resistance change
was what kept the oscillator stable.

- Brent (who is patiently sitting with foot in mouth...)