NAND synth

1 year ago 643
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An expansion of the Chaos Nand drone synthesizer.

This one has been fine tuned so sound is a little bit less out of control. Gate inputs have been added to control the characteristics of the sound from a sequencer (but not its pitch).

Potentiometers description:

  • POT1: Main pitch. Controls the 2 main oscillators at the same time, with lovely imperfections so they drift a bit out of tune.
  • POT2: Filter. Simple 2nd order low-pass filter for muffled sound.
  • R1: Rhythm. Controls the speed of the on/off LFO.
  • R2: Detune. Detunes one oscillator from the base frequency. Tracks poorly when combined with POT1, which adds character.
  • R3: Character. Modulates the sound of the main oscillator, which sounds somewhat like FM or a resonant filter depending on the other settings.

Switches/gates description:

  • Rhythm gate/switch: Turns on/off the LFO
  • OSC2 gate/switch: Turns on/off the second oscillator
  • Octave switch: Select the oscillator octave. C4-C6 determines the octave for OSC2 and C7-C9 determines the octave for OSC1.
  • Note gate/switch: Main output gate.
  • Note on button: Forces playing a note. Put a momentary push button here for rhythmic inspirations.




PCB 1.0

PCB 1.1


ID Name Designator Footprint Quantity
1 Rhythm switch P4 HDR-TH_2P-P2.54-V-M 1
2 OSC2 switch P6 HDR-TH_2P-P2.54-V-M 1
3 Note on button P8 HDR-TH_2P-P2.54-V-M 1
4 Power P10 HDR-TH_2P-P2.54-V-M 1
5 BC547 Q1 TO-92_3PIN-L4.95-W3.94-PITCH2.54-L 1
6 Octave switch P9 HDR-TH_4PIN-V-ROW2-COL2-MALE-PITCH2.54 1
7 100u C16 1206 1
8 Note gate jack P1 HDR-1X1/2.54 1
9 Mute switch P2 HDR-1X1/2.54 1
10 Rhythm gate jack P3 HDR-1X1/2.54 1
11 OSC2 gate jack P5 HDR-1X1/2.54 1
12 Output P7 HDR-1X1/2.54 1
13 10n C1,C2 0805 2
14 10u C3 0805 1
15 100n C4,C5,C6,C7,C8,C9,C10,C11,C12,C13,C14,C15 0805 12
16 1k R6,R15 0805 2
17 1M R5,R9,R11 0805 3
18 100k R7,R8,R10,R4,R16,R18 0805 6
19 100k POT2,POT1 RK097121009N 2
20 10K R3,R2 RK097111080J 2
21 1M R1 RK097111080J 1
22 470k R12 0805 1
23 10k R13,R14 0805 2
24 CD4093BCN U1,U2 DIP14 2


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