Forgot the name of this circuit (description inside)

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The discussed circuit involves measuring two resonant frequencies using an LM741 operational amplifier and two 555 timer ICs, one functioning as a metal detector and the other for resonance matching. It is suggested that the circuit operates as a mixer, producing an audible difference frequency when the outputs of the two oscillators, which operate above human hearing range, are combined. The circuit's purpose is to facilitate metal detection through frequency comparison. The original poster seeks clarification on the circuit's name, suspecting it may be related to an OP Amp differential amplifier. Overall, the conversation centers on identifying the circuit's function and name in the context of metal detection technology.
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A circuit that measures two resonant frequencies and compares them with an LM741. One 555 is a metal detector with a coil of wire, and the other 555 is to be matched in resonance.

Any idea what the name of this circuit is? I thought it was an OP Amp differential amplifier, for metal detection, but as you can imagine double checking that on google is a little difficult
 
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That would be a mixer.

The two oscillators produce an output above the limit of human hearing, but when the two mix, the difference frequency is audible.
 
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