PREAMP


Posted on Feb 6, 2014

The input stage is the most critical for common-mode rejection and noise. We used a Burr-Brown INA121 differential amplifier, set to a gain of 10. The input stage is DC coupled. With a 9-volt supply, a differential DC offset of up to about a volt is tolerable. Offsets of a few hundred millivolts are typical, assuming similar metals for the differe


PREAMP
Click here to download the full size of the above Circuit.

ntial electrodes. The common-mode rejection of the circuit is as good as the Burr-Brown head-stage. Any one of the opamps in the circuit can be removed (along with its supporting resistors and capacitors) if the function is not needed. For instance, if the 60 Hz notch filter is not needed, output may be taken from the output of the third op-amp.




Leave Comment

characters left:

Related Circuits

  • New Circuits

    .

     


    Popular Circuits

    Sensitive rf voltmeter
    avr microcontroller circuit
    microcontroller Arduino 230v Light bulb dimming
    Electronic counter
    The many ideas of 100 watt amplifier circuit
    Light Activated Relay with 555 Circuit



    Top