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Szukana fraza: [Abstrakt = "Theoretical and experimental studies of the frequency dependence of voltage responsivity of a pyroelectric detector should be performed applying sinusoidal modulated optical radiation. However, in the majority of papers, the measuring results of frequency characteristics were obtained for the optical radiation signal of trapezoidal or rectangular shape because of the use of an electromechanical modulator of optical radiation. Such results must be charged with error. In the paper the low cost electronic circuit of high power LED driver was proposed. The Led driver allows to produce sinusoidal current driving the LED and as result sinusoidal modulated radiation."]

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