[sdiy] Visible Tube Organ

[Harry Bissell Jr]

That is it exactly.

The same principle was used in industrial controls
with unijunction transistors... you use a current
source to charge a cap to just 'less' than the desired
period, then apply a short sync pulse that puts you
over the top.

The 1970 era "Thumpa-Thumpa Box" from Popular
Electronics is a musical example of the same...

H^) harry


--- Toby Paddock <tpaddock at seanet.com> wrote:
> http://www.kitphoenixx.freeserve.co.uk/project_2.htm
> Neon Gas Tube Frequency Dividers Project
> 
> I can't quite see what it's doing. I can see how 
> you could have a neon relaxation oscillator 
> with an additional charge *thump* from another 
> oscillator. If the period of the neon osc is 
> longer, then it is likely to trigger during one 
> of the *thumps*. Kind of a soft sync. And that 
> would be a division of the *thumping oscillator*.
> 
> One of the things I want to try, because 
> it's time for a ...
> 
> NEON REVIVAL
> 
> Later,
> Toby
> 
> Scott Gravenhorst wrote:
> > "neon dividers" ?  Is this a neon bulb flipflop
> that does the
> > divide by two thing ?  I'd _love_ to see a
> schematic of that
> > part!
> > 
> > Toby Paddock <tpaddock at seanet.com> wrote:
> > >
> > >Assuming that subject line makes it past 
> > >the spam filters...
> > >
> > >Did someone post about someone who took the 
> > >tone generator from an organ and put it in 
> > >display box? It would have been a year or so ago.
> > >
> > >After the interesting organ talk lately, I took 
> > >a look inside my old Lowery LSL tube organ. 
> > >The neon dividers light up when you play it. 
> > >Cool. I was thinking that in an alternate 
> > >universe - where I had much more time, energy, 
> > >focus, brains, and I could actually play 
> > >keyboard - I would put the hang the tone chassis 
> > >in a plexiglass box seperate from the keyboards.
> > >
> > >Then later that started sounding familiar, like I
> 
> > >had heard that somewhere. Like probably here.
> > >
> > >?
> > >
> > >Later,
> > >Toby
> > >Paddock
> > >
> > 
> 
>