Here is a circuit of a precision amplifier with digital control can be useful for signal conditioning of low output transducers in milli volt range.The resistors R3 to R6 can be selected by the user and can be anywhere from 1 kilo-ohm to 1 meg-ohm to select the appropriate gain of the precision amplifier. C1 reduce ripples in the voltage and Z1 and Z2 limits input voltage to +- 4.7V
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Precision amplifier circuit shown in figure, The IC1 opamp us used to increase the input impedance to avoid floating of the inputs when no measurement is being made. IC5 is used to restore the polarity of the input and works as an inverting buffer amplifier while IC4 is an output buffer.Eight steps for gain or attenuation can be added by using two CD4051/52
Some applications:
1. Error correction in transducer amplifiers by correcting gain
2. Auto ranging in DMM.
3. Sensor selection or input type selection in process control.
4. Digitally preset power supplies
5. PC or micro controller based instruments
Some applications:
1. Error correction in transducer amplifiers by correcting gain
2. Auto ranging in DMM.
3. Sensor selection or input type selection in process control.
4. Digitally preset power supplies
5. PC or micro controller based instruments
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