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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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Pre-Amp Condenser Microphone Circuit

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Pre-Amp Condenser Microphone Circuit is straightforward, consisting of two levels. with wide dynamic regions, small noise, and can with an extended cable regarding 50 meters.

Note:
all capacitor (elco) using 25-voltto avoid the buzzing sound, use a good regulator supplayThis circuit can provide voltage 6-20volt
This circuit uses low noise transistors are kind types: BC 650 C but the transistor is hard to search out, so you'll replace it with 109 BC is not any less sensible. This condenser mic component in it's a really sensitive microphone, and to use this mic condenser needed voltage between 2-10 volts, for that we are able to resistors in series with 1K-10 K ohms, within the picture above the tide 1k ohms.

Pre-Amp Condenser Microphone CircuitPin BC109
  1. Emitter
  2. Base
  3. ollector, connected to the case

BC109 limiting values

collector-base voltage 30 V
collector-emitter voltage 20 V
emitter-base voltage 5 V
collector current (DC) 100 mA
peak collector current 200 mA
peak base current 200 mA
total power dissipation Tamb £ 25 °C - 300 mW
storage temperature 65 +150 °C
junction temperature 175 °C
operating ambient temperature -65 +150 °C
DC current gain (hFE) IC = 10 mA; VCE = 5 V 100 -- 270

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