Is it possible to construct a hall effect transducer without the use of p-type semiconductors? I've been looking into the fundamental design of a hall effect sensor, and it generally comprises some amplification/thermal control bits and pieces that all are bound to the most important part, the hall element itself. I'm familiar with all the little bits from other work. But I need the element first. Commercial hall effect sensors employ elements made out of superthin wafers of p-type semiconductor, from what I've seen. Gallium arsenide and indium antimonide are the norm in the industry (again, from what I've seen). However, I definitely do not have access to these materials. From a theoretical standpoint, the Hall effect creates a potential difference across any conducting plate that has a current running across it. However, theory often fails to translate into reality. I am seriously in doubt of the idea that I could use any old metal plate, scrub it down, and pipe a current across it to observe the Hall effect (in at least a response of tens of microvolts, which could be amplified with an ultralow offset opamp like an OP07). Is this possible, or (as I suspect) am I spouting impossibilities? PS: My theoretical knowledge is running a bit short here since I'm not quite sure how to analyze the hall response theoretically (which would let me figure out if building my own hall element was possible), when I don't know how to analyze the charge carrier density theoretically. Wikipedia tells me that the carrier density is usually determined by analysis with the Hall effect >_> not very useful for this problem. Theory of charge carrier density is a question for another time though.