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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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Voice Recorder using ISD1000A IC

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Voice Recorder using ISD1000A IC Circuit

The ISD1000A is usually a Primary Analog Hard drive device that allows you to store 20 seconds value of voice data on an IC chip which can be engage in backed at any time. The information recorded will stay in memory even if the power is removed. To apply the Voice Recorder using ISD1000A IC circuit easy apply power to the circuit, push the record switch and hold. Talk clearly in to the microphone. You will have up to 20 seconds of voice message that you could save. If you talk beyond that period the chip may simply save the first 20 seconds. After recording, release the record switch.

To playback the message, press the playback message and the message you recorded will play back. The microphone is definitely electret mic and the speaker is a 8 ohm speaker. If you are using a 16 ohm speaker then the 10 ohm resistor marked optional, can be eliminated. This circuit could possibly be the base of many other large projects. Such as it could be part of an alarm circuit which will plays back a voice alert when the alarm circuit is activated.

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