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

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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
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5 Watt Audio Amplifier based LA4460

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This 5 W audio power amplifier is built for general purpose and can drive speakers approximately 8 to 12 inches. This 5W power amplifier circuit is based on the Sanyo LA4460 IC which used as an audio output.
This Low-power amplifier circuit have built in loudness control, driver amplifier Q1, and the bass/treble controls of around ± 10 dB boost / cut. It would be useful in a wide variety of situations. Either displayed ac supply can be used, or 12 VDC supply can be connected to points A & B (positive) and C (negative).
For stereo circuit can be used two of this circuit by using ganged potentiometer at R2, R7 and R11. T1 is 12V at 1 ampere plug-in transformer.
Notice :
IC1 should be mounted with the heatsink. Power output is around 5 W.
A 4 “x 2″ x 0.050 “aluminum heatsink should be sufficient.

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