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- W1504780441 abstract "Abstract : Three marginal oscillator circuits are evaluated in their signal-to- noise performance in a complete nuclear magnetic resonance spectrometer. A circuit based on the hybrid Darlington source follower is superior to the other two, a modified Donnally oscillator and an FET cascade oscillator. Also the hybrid Darlington circuit has a voltage gain of 0.95 as compared, respectively, to 0.79 and 0.53 for the other two circuits. A sensitive but easy to understand phase sensitive detector of original design is presented as an integral part of the system, allowing simultaneous observation of the Lorentzian absorption signal and its derivative. Another new development is an external RF injection mode of operation of the marginal oscillators which permits observation of easily saturated NMR lines. Using this system, the variation of proton line widths in water as a function of the concentration of paramagnetic CuSO4 in the water is presented. Theses." @default.
- W1504780441 created "2016-06-24" @default.
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- W1504780441 date "1988-12-01" @default.
- W1504780441 modified "2023-09-24" @default.
- W1504780441 title "Developing improved nuclear magnetic resonance marginal oscillator spectrometers for advanced teaching laboratories" @default.
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