Forgot the name of this circuit (description inside)

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SUMMARY

The discussed circuit is a metal detector utilizing two 555 timer ICs and an LM741 operational amplifier. One 555 timer functions as a metal detector with a coil of wire, while the second 555 timer is configured to match the resonance of the first. The circuit generates two oscillators that produce frequencies above human hearing, and their mixing results in an audible difference frequency. This setup effectively demonstrates the principles of frequency mixing in metal detection applications.

PREREQUISITES
  • Understanding of 555 timer IC functionality
  • Familiarity with operational amplifiers, specifically the LM741
  • Knowledge of resonance and frequency mixing concepts
  • Basic electronics skills for circuit assembly
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  • Study operational amplifier configurations and their uses in signal processing
  • Explore the principles of frequency mixing in audio applications
  • Learn about metal detector circuit designs and their components
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Electronics enthusiasts, hobbyists building metal detectors, and students studying circuit design and signal processing.

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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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