The first time I use FM receiver because you have here amplification and tone is present via "interference" in the FI section. The circuit of emission I put near the radio.
The second time, invent a system of "interference" (the tone in the receiver). Here I was "liberated" of the need of locate the circuit of emission near the radio. The loops creates the necessary "interference". I bought this detector to a man who wish this. He brought me a silver spoon located withs this, and later he found more things as roll of copper wire, etc. Don't know more of this man.
The third time I use a milivoltmeter based on 741 (classic simple circuit), but when I raise, this beeps. So, here you must reduced the sens. and stay more critic. Rapidly found a washer of copper. I leave this for the problem. I'm not sure to use low noise ICs in this application for example.
You measure changes in audio, because simple audio I use. Regarding audio, Alonso told me once: "The phenomenom is present in a piece of wire. The matter is to convert in sound." Great words of this genius!
The second time, invent a system of "interference" (the tone in the receiver). Here I was "liberated" of the need of locate the circuit of emission near the radio. The loops creates the necessary "interference". I bought this detector to a man who wish this. He brought me a silver spoon located withs this, and later he found more things as roll of copper wire, etc. Don't know more of this man.
The third time I use a milivoltmeter based on 741 (classic simple circuit), but when I raise, this beeps. So, here you must reduced the sens. and stay more critic. Rapidly found a washer of copper. I leave this for the problem. I'm not sure to use low noise ICs in this application for example.
You measure changes in audio, because simple audio I use. Regarding audio, Alonso told me once: "The phenomenom is present in a piece of wire. The matter is to convert in sound." Great words of this genius!


And also nothing to see GENERAL FORMULAS with DERIVATED APPLICATIONS. IF YOU DON'T KNOW, YOU CAN FOUND USES OF GENERAL PRINCIPLES. If you don't know, the world of the energy is vaste!!! Do you see the difference?

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