Cover by David Erik Nelson

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Expanding the Cigar-Box Synthesizer

As designed, this Cigar-Box Synthesizer only mixes two of the octaves that the CD4040 offers: The straight signal produced by the oscillator (the CD4093) is on pot A and is mixed with the tone one octave lower (pin 9 on the CD4040) and two octaves lower (pin 7 of the CD4040). Technically, each output on the CD4040 (pins 1 through 9, 11, and 12 through 15) is producing a fraction of the number of pulses that the chip receives on its input (pin 10). Pin 9, for example, puts out one pulse for every two that come in (thus producing a tone one octave below the input); pin 7 produces one pulse for every four that come in (i.e., two octaves below the input), and so on. Each of the remaining open pins on the CD4040 ...

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