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National Repository of Grey Literature 2 records found  Search took 0.01 seconds. 
Audio amplifier for detecting wood-destroying pests
 Jaroš, Ondřej ; Křepelka, Pavel (referee) ; Friedl, Martin (advisor)
This bachelor´s thesis is focused on design of detector of wood-destroying pests, which is solved by using an acoustic sound source with piezo electric element as a sensor. The acquired signal is step by step amplified to a level when we can observe the audio spectrum using a headphone. The realized audio amplifier is complemented supplemented by an active analog filter for the ability to listen to a narrower frequency spectrum. The next feature of the detector is that it displays the frequency spectrum on an LCD display ranging from 0 Hz to 10 kHz. The spectrum of the signal is acquired by using DFT transformation. Analysis of the device is firstly described from the theoretical part through the realized design. At the end of document the results are summarized.
Detailed record
Audio amplifier for detecting wood-destroying pests
 Jaroš, Ondřej ; Křepelka, Pavel (referee) ; Friedl, Martin (advisor)
This bachelor´s thesis is focused on design of detector of wood-destroying pests, which is solved by using an acoustic sound source with piezo electric element as a sensor. The acquired signal is step by step amplified to a level when we can observe the audio spectrum using a headphone. The realized audio amplifier is complemented supplemented by an active analog filter for the ability to listen to a narrower frequency spectrum. The next feature of the detector is that it displays the frequency spectrum on an LCD display ranging from 0 Hz to 10 kHz. The spectrum of the signal is acquired by using DFT transformation. Analysis of the device is firstly described from the theoretical part through the realized design. At the end of document the results are summarized.
Detailed record

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