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Design and Testing of a Self-Powered Wireless Hydrogen
Design and Testing of a Self-Powered Wireless Hydrogen

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PPT - LSU Physics & Astronomy

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... Figure 4: Upper trace is test signal with amplitude of 53mA, and the lower is the output signal having amplitude of 1.06V. The width of pulse is 0.89sec. The response to a burst pulse with frequency of 500 kHz and 6 MHz is also tested. The duration of the burst is 1sec. At an early stage, we observe ...
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... saturation due to the high gain amplification of this electrical noise. The bias current flowing in Rf also produces offset voltage error in the output. This voltage error can be minimized by adding an appropriately sized resistor in the noninverting input of the OP AMP. The bias currents flowing th ...
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******* 1

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Heterodyne



Heterodyning is a radio signal processing technique invented in 1901 by Canadian inventor-engineer Reginald Fessenden, in which new frequencies are created by combining or mixing two frequencies. Heterodyning is used to shift one frequency range into another, new one, and is also involved in the processes of modulation and demodulation. The two frequencies are combined in a nonlinear signal-processing device such as a vacuum tube, transistor, or diode, usually called a mixer. In the most common application, two signals at frequencies f1 and f2 are mixed, creating two new signals, one at the sum f1 + f2 of the two frequencies, and the other at the difference f1 − f2. These new frequencies are called heterodynes. Typically only one of the new frequencies is desired, and the other signal is filtered out of the output of the mixer. Heterodynes are related to the phenomenon of ""beats"" in acoustics.A major application of the heterodyne process is in the superheterodyne radio receiver circuit, which is used in virtually all modern radio receivers.
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