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My first experiments used the Allegro Hall-effect sensor, a 7805 5 VDC regulator, and a voltmeter. Worked fine, but as noted, you needed to "do the math" if you wanted an actual gauss reading.
The reason for using the op-amp is to scale the output such that I can get a direct gauss reading...
Hi Eric, I appreciate your help. What I'm trying to do is to make the project as small as reasonable so as to have it track-side portable. If I could run it off of one 9 DVC battery rather than two, all the better. As mentioned, I have had the circuit working on an Op-amp that required +/- VDC...
I've used a couple of different quad op-amps that require +/- power supplies, as well as a couple of +/ground supply quad op-amps. Don't remember the part numbers off the top of my head. The linear Hall effect sensor is an Allegro 3 lead unit. I've been powering it with a 5 VDC regulator...
Thanks for your reply. Been trying to figure this one out on my own. I'll research "virtual ground" and go from there.
Thanks again for pointing me in the right direction.
Any suggestions for a gauss meter circuit? I've been experimenting with a linear Hall effect sensor. I can get the darn thing to work, but I've been trying to use an op-amp to get a "0" reading with no input; a "+" reading on one pole, and a "-" reading from the other pole. A preference would be...
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