Re: [TCML] on rotary gaps and tone wheels

["Carl Noggle" <cn@xxxxx>]

That's very cool.  You could say you had a Bb Tesla coil.  That's really 
funny.

Reminds me of a friend that has a tambourine, and kept bugging a local band 
to let him sit in.  They told him that it was really unfortunate, but he had 
a G# tambourine and none of their songs were in G#.  He went to a local 
folk music store for advice, and they told him they could order him a capo 
for it.  After several months it still hasn't come in for some reason.

How would you capo a TC?

---Carl






-----Original Message----- 
From: Jim Lux
Sent: Monday, October 22, 2012 5:05 PM
To: Tesla Coil Mailing List
Subject: [TCML] on rotary gaps and tone wheels

Just in case someone wants to think about it..

Here are the ratios for just intonation (for some of the "black keys"
various authors have different ratios.. usually larger numerator and
denominator).  And yes, I do know that Bb and A# are not actually the
same note, but I'm writing it down that way for convenience. I played
clarinet as a child, so I naturally think of it as Bb rather than A#,
because the instrument is in the key of F.


C 2:1
B 15:8
 Bb 9:5
A 5:3
 G# 8:5
G 3:2
 F# 7:5
F 4:3
E 5:4
 Eb 6:5
D 9:8
 C# 16:15
C 1:1

You could use this to figure out how many electrodes on the rotor and
how many fixed electrodes.. For instance,  say you have 2 fixed
electrodes and 4 on the rotor you'd get 4 pulses/revolution.  If you
added a pair of electrodes to the rotor you'd get 6 pulses/rev, or a
ratio of 3/2 to the first case.. so you can make C and G (a fifth)

You could also do it by gearing different speeds.. It looks like 1/5th
is a pretty useful ratio for a lot of the "black keys".


An interesting question would be what the minimum number of rotors (with
a fixed number of electrodes) you could use, with changing the number of
fixed electrodes (which are easier to switch).  Or, whether you can do
it with a bunch of rotors on a common shaft.

This would tend to create a just intonation as opposed to a equal
tempered scale.  That is you'd have a TC that has a distinct key, like a
woodwind or brass instrument (other than a trombone.. that's the
variable speed drive on the rotary gap).



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