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Chapter 26 - Ultrasonic Microphone

As a convenience to those who have purchased the first book, Electronic Projects for the Evil Genius, we offer the specialized parts for this project if they cannot be found at your local electronics store:

27MH - IU27H 27 millihenry Inductor
TR8925R - IUTR8925R Receiving Transducer 25 khz
PAREF12 - IUPARA12 12 inch Parabolic Reflector