Science Buddies: "Ask an Expert"

Hi,
I was conducting an experiment based off the "Measure Your Magnetism" project at science buddies.com. Here's the link:
https://www.sciencebuddies.org/science- ... ml#summary

So, I have made the gauss meter, and I got the 2.5 volts that you should get as a starting voltage with no magnet near the gauss meter, but when I touch a magnet to the linear IC, I am not getting a different voltage like I am supposed to get.What do you suggest I do? Is there a chance that this might be happening because I have a different linear IC? How am I supposed to get a change in voltage when I put a magnet to the IC?

Thanks for your help.

scienceiscool21 - Your note suggests that you might be using a different IC than the one specified in the procedure. You described it as a linear IC. The experiment calls for a Hall effect circuit, a device that is responsive to magnetic fields. If you are using a Hall effect with a different part number it might work fine. What device number are you using?

Rick Marz

Rick Marz,
I am using a NTE7225 integrated circuit precision temperature sensor from NTE electronics.

Thanks,
scienceiscool21