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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

30W Class AB Amplifier Circuit With TIP3055/TIP2955

This amplifier has been simulated extensively, although i haven't built it nonetheless. i'm saving circuit this one for a time after I will spend smart time building and making sure the wiring goes to be optimal. i'm attending to use this amp in a bi-amp scenario with passive filters on the input. this may result in 2 amplifiers that amplify the highs and 2 amplifying the lows (for stereo) and therefore I can do an effective power of 120W into each speaker.

To set the on top of amplifier up, set R1 to max and R12 to 0. once doing this successfully, power on the amplifier. Set R1 in order that the measured output offset is between thirty and 100mV. Once set, modify R12 slowly to attain a quiescent current of around 120mA. Keep checking the quiescent current as the amp heats up because it would possibly modification owing to voltage drop changes in the output devices caused by heat. The heatsinks ought to be 0.6K/W or less for two amplifiers.

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