<div>Thanks guys, most helpful.</div><div> </div><div>G.<br><br></div><div class="gmail_quote">On Sun, Oct 9, 2011 at 5:50 PM, Peter Vogel <span dir="ltr"><<a href="mailto:vogel.peter@gmail.com">vogel.peter@gmail.com</a>></span> wrote:<br>
<blockquote style="margin: 0px 0px 0px 0.8ex; padding-left: 1ex; border-left-color: rgb(204, 204, 204); border-left-width: 1px; border-left-style: solid;" class="gmail_quote">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.<div>
<br></div><div>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.</div>
<div><br></div><div>Peter+<br><br><div class="gmail_quote"><div><div></div><div class="h5">On Sun, Oct 9, 2011 at 10:04 AM, George Kennie <span dir="ltr"><<a href="mailto:geobet4evr@gmail.com" target="_blank">geobet4evr@gmail.com</a>></span> wrote:<br>
</div></div><blockquote style="margin: 0px 0px 0px 0.8ex; padding-left: 1ex; border-left-color: rgb(204, 204, 204); border-left-width: 1px; border-left-style: solid;" class="gmail_quote"><div><div></div><div class="h5">
<div>I have a question that came up at ther flying field yesterday.</div><div>The query was: What produces the arming tone and the cell count tones that are </div><div>audible when the battery is plugged in to an electric motor powered model?</div>
<div> </div><div>There were guys that were adament that the tones were produced by the current</div><div>surging through the motor.</div><div> </div><div>There was confusion due to the fact that no visible speaker could be observed.</div>
<div> </div><div>I felt that there had to be nano oscillator circuits in the esc working some kind of a</div><div>nano piezo circuit generating the required tones, but I really had no idea.</div><div> </div><div>Can somebody please clear up the confusion, ? anybody,? Peter???</div>
<div> </div><div>Thanks </div><div> </div><div>Georgie </div>
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