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High CMRR Instrumentation Amplifier (Schematic and Layout) design for biomedical applications

Instrumentation amplifiers are intended to be used whenever acquisition of a useful signal is difficult. IA’s must have extremely high input impedances because source impedances may be high and/or unbalanced. bias and offset currents are low and relatively stable so that the source impedance need not be constant. Balanced differential inputs are provided so that the signal source may be referenced to any reasonable level independent of the IA output load reference. Common mode rejection, a measure of input balance, is very high so that noise pickup and ground drops, characteristic of remote sensor applications, are minimized.Care is taken to provide high, well characterized stability of critical parameters under varying conditions, such as changing temperatures and supply voltages. Finally, all components that are critical to the performance of the IA are internal to the device. The precision of an IA is provided at the expense of flexibility. By committing to the one specific task of

ToothBrush with built-in Justin Bieber songs



I think many of our readers have encountered the problem of making their little son or daughter to brush their teeth. Even with the cutest and the coolest toothbrush and the sweetest toothpaste it’s still a hard work, sometimes almost impossible. But what if we give them a little award (depending on each child’s musical taste) every time they brush their teeth? The thing above is a regular toothbrush, with a secret weapon. At a press of the button it plays a Justin Bieber’s song for two minutes - which is the same amount of time that dentists recommend to brush your teeth. Not much of a choice though, it has only 2 of JB’s songs: U Smile and Baby. A trio of LR44 batteries will keep this puppy running and bring you the joy (or a torture) of hearing the Canadian crooner every time you (or somebody else) brush your teeth.

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