[NSRCA-discussion] beep tones

[Peter Vogel]

Yep -- it's the motor that acts as a speaker for the tones generated by the
ESC.  No motor, no sound.  You try different mounting options for a motor
and you'll see that the tones change in volume and pitch depending on the
resonance of the surface to which they are mounted -- basically by rapidly
vibrating the motor at specific frequencies you generate a tone matching
that frequency.

There used to be an ESC to which you could upload a small WAV file and it
would play the tune from the WAV file when it finished arming.  Totally
superfluous but kinda fun.  I don't recall who made it, may have been Jeti.

Peter+

On Sun, Oct 9, 2011 at 10:04 AM, George Kennie <geobet4evr at gmail.com> wrote:

> I have a question that came up at ther flying field yesterday.
> The query was: What produces the arming tone and the cell count tones that
> are
> audible when the battery is plugged in to an electric motor powered model?
>
> There were guys that were adament that the tones were produced by the
> current
> surging through the motor.
>
> There was confusion due to the fact that no visible speaker could be
> observed.
>
> I felt that there had to be nano oscillator circuits in the esc working
> some kind of a
> nano piezo circuit generating the required tones, but I really had no idea.
>
> Can somebody please clear up the confusion, ? anybody,? Peter???
>
> Thanks
>
> Georgie
>
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