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Bajar el Ruido - Reduce Lm386 Noise hiss distortion

noviembre 26, 2023

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Mira como puedes reducir el ruidio en el lm386 o el receptor neofito.

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SW40+ I.F. Crystal Filter Ladder Type Cohn

This note proceeds through the design of a Cohn-type crystal ladder filter. Starting with fixed crystal specs and desired bandwidth, a simple generic filter is designed . The generic filter is then modified to accommodate source and load impedances found in the SW40+ receiver. Component values work out close to those in the rig. The simplest form of the ladder-type Cohn filter requires at least two crystals, but any number can be cascaded. Between pairs of crystals and ground must appear a coupling reactance. Source resistance and load resistance must also be defined. A two-crystal filter would result in inadequate sideband suppression. Four or more crystals require extreme care in selecting crystal frequencies, coupling capacitors and termination resistances. Crystal Model From the Handbook you should review the electrical equivalent of a quartz crystal. By far, the two most important crystal parameters are the motio...

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