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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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FM Transmitter

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100 meter FM transmitter


Frequency Range: 85-110 MHz


This is tested project and verified by me..........


Simplest FMT can be used with number of low amplitude audio output devices for transmission up to 100 m. Audio Input can be a Microphone,PC, DVD, TV,Mobile any other sound output device.,

Stop disturbing others while watching TV and go Wireless .



Hardware Description:



BC108 act as buffer amplifier to isolate the frequency generating and modulating stage.

2N2369 is a RF amplifier and RF generator to modulate the Input signal at 85-110 MHz.

C5 trimmer to change the frequency and C6 to vary the power output.


L1 can be 1 uH fixed resistor or can be made at home by using 24SWG wire having 4 turns on 6 mm diameter former.

Antenna 1-2 m copper wire.

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