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This project was created using Altium CircuitMaker. All design files including the 3D model can be viewed here: https://365.altium.com/files/4F6F4C2E-66A3-4076-8B9E-142F36BC1FB1
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This PCB uses a 555 timer to generate sounds part of the diatonic scale on a piano.
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One of the resistors used to set the frequency of the clock signal is fixed.
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The resistor whose connected momentary switch is pressed acts as the other element that dictates the frequency of the clock signal.
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The output of the clock then feeds to an NPN transistor that acts as an audio amplifier.
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The amplified signal is then run through a speaker so the user can hear the piano note.
Video Demo: https://www.loom.com/share/736d4f29e4ee4808afbea287dc831833