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Need Help to find suitable magnetic sensor

Hi
I need magnetic sensor, that produce analog voltage proportional to magnetic field.
I found linear hall effect sensors.
http://www.analog.com/media/en/technical-documentation/data-sheets/AD22151.pdf
https://www.diodes.com/assets/Datasheets/AH8502.pdf

But I need ominipolar 1D sensor with analog output. I searched in mouser and Digikey, I could not find that type.
are there any reason for it?

basically I want to control light intensity of bulb which is proportional to the magnetic field strength regardless of North or South pole.
I know I can use bipolar type, but my idea is to control NPN transistor directly from sensor analog output. so I like if I can have omini polar sensor with 0V output at 0 Gauss.

Please help me if you know any type of these sensor?

Thanks
Athula
 

(*steve*)

¡sǝpodᴉʇuɐ ǝɥʇ ɹɐǝɥd
Moderator
Hall effect is sensitive to the strength as well as the direction of the magnetic field. It is thus not surprising that linear detectors are bipolar.

A precision rectifier could possibly solve your problem, but you need an OP-AMP and several other assorted components.

Maybe you could use 2 sensors and back to back and a pair of diodes to select the output with the highest magnitude. At rest, the output is likely to be mid-rail, that may also be problematic.
 
Yes, steve, I thought about OP Amp with transistor, can I directly buy differential amplifier, which will amplify difference but always output is positive, ?
Normal differential amplifier output can go positive or negative, but I need analog circuit that produce absolute value ( |v-v0| ).
are there any such a ICs?

also could you please look at this datasheet, I think I found some solution here. ( Type AA sensors)
http://www.nve.com/Downloads/analog_catalog.pdf

Thanks
 
Hi
I need magnetic sensor, that produce analog voltage proportional to magnetic field.
I found linear hall effect sensors.
http://www.analog.com/media/en/technical-documentation/data-sheets/AD22151.pdf
https://www.diodes.com/assets/Datasheets/AH8502.pdf

But I need ominipolar 1D sensor with analog output. I searched in mouser and Digikey, I could not find that type.
are there any reason for it?

basically I want to control light intensity of bulb which is proportional to the magnetic field strength regardless of North or South pole.
I know I can use bipolar type, but my idea is to control NPN transistor directly from sensor analog output. so I like if I can have omini polar sensor with 0V output at 0 Gauss.

Please help me if you know any type of these sensor?

Thanks
Athula

Have you looked at the Allegro hall devices like the A1324, 5, 6
Thanks
Adam
 
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