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Current Shunt Amplifier with digital control - del20014R6 is the Shunt thru which the current to be measured passes. F1 fuse is to protect shunt. D1-D4 ensures that the current flow is not broken if the shunt blows. The Ammeter is always used in series in a circuit.OP07 is used here as a digitally controlled amplifier as the voltage offset error is around 75uV. 4052's digital controls A-B set the range by selecting R1, R2, R3, R5 for the digital code at A-B. The inverting amplifier changes the gain and four current ranges are got. The output of this circuit has to go to a buffer and cannot be loaded directly. R8 is offset trim at very high gains, it has to be adjusted for a zero output of opamp for zero current measured. To view the circuit below, Click the Link of PNG or PDF and view the Circuit, PNG can be Scrolled with Mouse and PDF can be Viewed-Zoomed in the Browsers with Acrobat plugin. The Javascript and Images must be enabled in your Browser. |
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| Current Shunt Amplifier with digital control - del20014 |
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Data sheets and info useful to study and build this circuit. Ammeter Design Ammeter ammeter meter shunts using a multimeter Circuits. What is current? Make Your Own Shunts Learn the Importance of Isolation in Data Acquisition Applications Tinsley Precision Instruments High Current DC Current Shunts |