This is a traditional configuration that we find in many technical publications from all ages. It is a simple organ in which the capacitor associated with each key determines the note that is emitted when we press it. The circuit can be powered by voltages from 9 to 12 V. Although the adjustment is critical for using only one potentiometer, there is the possibility to modify the circuit to have individual adjustments for each note. The unijunction transistor can be 2N2646.
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