You don't even need to buy one, a cheap piezo disk,
12vdc, 555 timer and a 2222 will work. I adjust the
output with a pot till I get lots of vapor, then read the
pot and use the closest 5%, or 1% if I have one. Most
of the usual piezos seem to work good in the 35-45KHZ
range.
"William" <all_replies@news.group.please> wrote in message
news:cXe0c.17920$OH4.12163@fe2.texas.rr.com...
> "Roger" <rogerfo@start.no> wrote in message
> news:xqm_b.638$72.180224000@news.telia.no...
> > I am a member of Tromso Model Boat Club in Norway. We build scale
model
> > boats mostly in scale 1:16. My last project is an old Norwegian
destroyer,
> > "Sleipner", in scale 1:16, length 4,6 m (14 feet).
> > http://www.tmbk.no/sleipner1no.htm (Sorry, no English text so
far...)
> >
> > Can you help me with a smoke generator for this project?
> >
> > The small units which are available will be to small!
>
> If you can't find a ready made unit, I'd buy a bottle of theatrical
"fog
> juice"
> and experiment with a heater of your own design. Here's a page that
might
> give you some ideas (though it's not suitable for a model boat since
it uses
> a salvaged electric iron):
> http://softlyspokenmagicspells.com/halloween/fog.html
>
> Someone in another thread suggested the element from a 12 V
soldering iron
> as a possible heat source. A ceramic power resistor might be another
option.
> They can be driven pretty hot without damage, and the fog fluid will
carry
> of
> a lot of heat in any case. (One advantage to a power resistor is you
have a
> wide choice of values so you can tailor it to your needs.)
>
> The site above also suggests an ultrasonic atomizer as a
alternative. It
> might
> be adequate to your needs and it would have several advantages: It
would
> be clean, definitely non-toxic, and wouldn't use nearly as much
current as
> a heating element. (Fog juice is relatively non-toxic, but kinda
oily and it
> does smell.) You can buy the atomizer units new from fountain supply
> places on line. -Wm
>
>