Re: Help Finding Overtones, Again

["Tesla list" <tesla@xxxxxxxxxx>]

Original poster: "Antonio Carlos M. de Queiroz" <acmdq@xxxxxxxxxx>

Tesla list wrote:
>
> Original poster: FIFTYGUY@xxxxxxx
>
> In a message dated 12/15/04 1:46:05 PM Eastern Standard Time,
> tesla@xxxxxxxxxx writes:
> BTW, any luck measuring those overtones?

A method that finds all the overtones:
Build something as this, a low-impedance square wave generator:
http://www.coe.ufrj.br/~acmq/tesla/tuner.gif
(You can just shunt the output of a 50 Ohms square wave generator
with a 1 Ohm resistor (easy, but generates low-level signals), or
connect it to the system through a suitable transformer (tricky).
Use it to drive the Tesla coil, with the primary in place,
but change C1 to tune the system to the overtones (associate several
regular low-voltage capacitors in parallel, and add a radio variable
capacitor to fine tuning). You will see that you have found one
when complete beats are observed across the primary inductance.
When you find an overtone, slide a finger along the secondary
coil, and you will locate the voltage nodes, where there is less
change in the beat waveform.
It's a very funny experiment.

Antonio Carlos M. de Queiroz