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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

Variable Voltage Regulator Using IC L146

variable Voltage Regulator Using IC L146

Reguator This circuit is designed for general use. Advantages of the circuit are the first voltage can be adjusted from 0 V to greater and second duplex does not require a transformer secondary winding. For high voltage outputs L146 can be used or, alternatively, if you need a lower output voltage can be used IC 723.

Voltage regulation for integrated circuits is at least 2V. R3, R4, R5 and R6 resistors around this limitation and to maintain the output voltage level 0 with the help of the potentiometer P2. If the input voltage is less than required, this provides sufficient potential resistance between pins 4 and 5 numbered.

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