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phys 351 lab 10

phys 351 lab 10 - Peter Bohlen Lab 10 Transducers Sound and...

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Peter Bohlen Lab 10: Transducers – Sound and Temperature. Phys 117, Lab Section 457, Mondays 5-8 Honor Pledge__________________
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Section A: Transfer Response of Headphones/Speakers In section A, two speakers were taped together. One speaker received a signal input from the function generator, acting as the signal and the other speaker acted as the transducer which was hooked up to the oscilloscope. The circuit built is shown below. - The speakers were hooked up as shown above to the Function generator and the oscilloscope - The transfer function of the speakers was found by using the signal out over the signal in. The transfer function was taken from a range of frequencies of 200 Hz to 75000 Hz. The following bode plot was produced for the speakers. - Transfer Function of Speakers 0 0.005 0.01 0.015 0.02 0.025 0.03 0.035 0.04 0.045 0.05 4 6 8 10 12 ln(freq) Hz H(w) Series1 - The roll off in the low frequency was found to be around 1000Hz. This roll of as explained by the lab manual is caused by power consumption problems. The high frequency roll off, which is explained by the physical limitations of the mechanical response of the speaker materials, was found around 25kHz. This was measured at the right of the second peak. Looking at the bode plot, there was obviously a strange feature of this Bode plot in that there appeared to be two different maximums, and three different minimums. Around 5500 Hz, the gain of the function was very close to zero, but after that it began to increase again. I can only suppose this is also caused by the limitations and mechanical response of the speaker material.
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