The 555 is configured as an astable oscillator running at about 5MHz and with a loop antenna attached to its timing capacitor. The parasitic capacitance of the musician’s hand against the ...
The 555 isn’t just an oscillator, though. It can also be used in monostable (one-shot) mode, producing a fixed output pulse width in response to a low-going signal on the TRIGger input.
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