Strange mixer inputs

[tomg]

I've used lamps for all sorts of things. They suck up current
like a sponge. Any time I work on a transistor amp I use
one of these..

http://www.xavax.com/efm/guitar/warlock/page_006.html

Once you get used to it you can set amp-bias by how
brightly it glows. I've actually seen lamps used as emitter
resistors instead of a .33 @ 5 (10) watts before. It's sort of
a current limiting resistor.

BTW I know about the broken link on page 4. I'll get it all
fixed someday.

 -tg


----------
> From: KA4HJH <ka4hjh at gte.net>
> To: synth-diy at mailhost.bpa.nl
> Subject: RE: Strange mixer inputs
> Date: Monday, October 04, 1999 4:16 PM
> 
> >Apparently, these big monitor speakers have a fuse and a mini light bulb
for
> >protection. The fuse was fine, but one of the light bulbs was marginal!
I am
> >not sure electrically what the light bulb is being used for, but the
problem
> >was tracked down to that and replacing it did the trick!
> 
> Sounds like a ballast. Non-linear thermistor.
> 
> There was a guy whose model train kept derailing and shorting out his 
> electronic throttle, frying transistors, blowing fuses, or tripping 
> breakers constantly. He was too lazy to fix the track, but 
> fortunately a friend suggested putting a 12V taillight bulb in series 
> with the throttle. Now every time there was a short the filament 
> heated up from the increased current, increased its own resistance, 
> and limited the current enough to prevent anything from blowing.
> 
> Don't know if that's what's going on here but it's a good story.
> 
> Terry Bowman, KA4HJH
> "The Mac Doctor"
> 
> ICQ: 45652354