[NSRCA-discussion] beep tones

[George Kennie]

Thanks guys, most helpful.

G.

On Sun, Oct 9, 2011 at 5:50 PM, Peter Vogel <vogel.peter at gmail.com> wrote:

> 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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>
>
>
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