- Wed Aug 29, 2018 8:11 am
#200164
Hi All,
I'm trying to get a signal conditioner circuit working for a hall effect current sensor. The sensor, a Honeywell CSLA2CD, is powered by +8V, and the output of the sensor is +4V with no current sensed, and increases by ~32mV per amp. I designed the differential amplifier shown below, but it's not working as expected.
I believe the following should be applicable for this circuit: Isense(v) = (60K/10K)(Vin - 4)
Thus, when there is zero current, the output should be 0V, but it's about 3.8V
My goal is to use a simple op-amp circuit, powered from a single supply, to compensate for the 4V sensor offset, and to modestly scale the input. Max. current to be sensed is 20A. What am I missing?
Thanks,
John
I'm trying to get a signal conditioner circuit working for a hall effect current sensor. The sensor, a Honeywell CSLA2CD, is powered by +8V, and the output of the sensor is +4V with no current sensed, and increases by ~32mV per amp. I designed the differential amplifier shown below, but it's not working as expected.
I believe the following should be applicable for this circuit: Isense(v) = (60K/10K)(Vin - 4)
Thus, when there is zero current, the output should be 0V, but it's about 3.8V
My goal is to use a simple op-amp circuit, powered from a single supply, to compensate for the 4V sensor offset, and to modestly scale the input. Max. current to be sensed is 20A. What am I missing?
Thanks,
John
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