Construction Quickie--Instrumentation Amplifier

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By Bill Axsen

This is really a chop amp instrumentation amplifier. It is a differential amplifier that can amplify DC signals in the microvolt range and is accurate to plus or minus 1 microvolt. It has a gain of 1000 and the potentiometer, R1, can be used to zero the amplifier.

Decoupling capacitors must be used with this circuit to ensure stable operation. This amplifier has been used to amplify various transducer voltages, such as thermocouples and strain gages.


PARTS LIST FOR INSTRUMENTATION AMPLIFIER

Semiconductors:

IC1-LTC1052CN8 (Linear Technology, Chopper Stabilized Amplifier)

Resistors:

R1-1 Kilohm (1/2 watt, 1 %)

R2-1 Megohm (1/4 watt, 1%)

R3-10 Megohms (1/4 watt, 5 %)

R4-50 Kilohms (15 turn Pot)

Capacitors:

C1, C2--22uF, 16WVDC, Tantalum

C3, C4--0.01uF Ceramic

C5, C6, C7--0.1uF Metal Film (Radio Shack #272-1053)


adapted from: Electronics Handbook Vol. X


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