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I'm trying to make a cat purr noise but I'd like to do it more mechanically than using a sound file. It needs to fit into a box you can hold in your hand. I'm thinking of using a slow motor with a fan that flaps against a serrated edge but how can I get it low hertz like a cat? Thanks in advance for any ideas.

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    If the pitch is too high, the obvious answer is to slow the motor down. If you can't do that, try slowing the audio file after it is recorded. – Rory Alsop Oct 15 '18 at 11:28
  • Thank you. The motor needs to be fast enough to buzz like a purr, if I slow it down it won't work. I'm hoping to do it without using an audio file at all, just a purely mechanical purr. – Lisa Cole Oct 15 '18 at 20:54
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    Slow it, and add more spokes to the fan. Then it can buzz but be lower in frequency – Rory Alsop Oct 15 '18 at 21:04
  • Ah, genius idea. Thank you! Do you know of any materials that sound deeper than others? Metal is a bit pingy. – Lisa Cole Oct 16 '18 at 5:19
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Not mechanical, Voice Recorder Device Very High Quality with Play Back for Stuffed Animal Inserts and Craft Projects:

https://www.amazon.com/Recorder-Quality-Stuffed-Inserts-Projects/dp/B007TAATX2/ref=asc_df_B007TAATX2/?tag=hyprod-20&linkCode=df0&hvadid=198067106057&hvpos=1o4&hvnetw=g&hvrand=3353436460182717223&hvpone=&hvptwo=&hvqmt=&hvdev=c&hvdvcmdl=&hvlocint=&hvlocphy=1013802&hvtargid=pla-350915941135&psc=1

  • thank you! not what I wanted for this project but good for another :-) – Lisa Cole Jan 9 at 15:58

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