Revision history of "UltraEcho 2009Aug24"

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  • (cur | prev) 21:36, 24 August 2009SpammerHellDontDelete (Talk | contribs)‎ . . (+2,585)‎ . . (New page: =Hack Notes= ==Frequency Generator== We hooked up the 40 kHz ultrasonic transducer to the frequency generator, and listened to it using the Secret Sounds toy. Direct sound is very narro...)
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