This is a very simple toy organ circuit which built based timer IC 555. It only contains of several components, even a newbie can build this circuit easily. This circuit generates a tone according to the button being pressed.
This easy build toy organ can be powered with 6V battery supply or commonly general purpose power supply. Only 1 button can be pressed at a time, that’s why it is called a monophonic organ. You can change the 1k resistors to produce a more-accurate scale. You also can add new tones by add some switchs and 1k resistors. If you need a louder sound, you can add an amplifier on the output.
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