This circuit can create more complex noises than the original one since it uses all 4 NAND Gates of the chip. Depending on the used values of the parts it can produce metalic spectra or polyrhythmic beats. A optocoupler is used to control one of the NAND gates with a control voltage.
- 1* 4093 IC
resistors (R3- R6 are just bridges you can also use wires, for one of them no resistors is used but a connection to the optocoupler is made)
- R1 470
- R2 8.2k
- R3 - R6 10
- R7 1k
capacitors (use different values for other frequency ranges)
- C_A 100n
- C_B 1u
- C_C 4.7u
- C_A 47n
- 4 Potentiometers 500 or 100 kOhm (Alps PCB mounted) unsed for A-D tune
- 2 Potentiometers 10 kOhm (Alps PCB mounted) used for power and CV amount
- 3* switches (MULTICOMP SWITCH, PCB SPDT VERT on-on)
- 3* Jack connector (lumberg 1502 03 PCB mounted)
- 1* LED(for optocoupler)
- 1* LDR(for optocoupler)
- 1* piece of heat shrink tube(for optocoupler)
- 1* Battery Clip & Battery
All 4 NAND Gates are connected in series from C to B to A to D. The values of the according capasitors are decreasing resulting in a higher frequency from the first to the last gate. The A/B switch connects the A or B NAND gate to the A/B Out-Jack. The B-IN switch connects supply voltage or the C NAND gate to the B NAND gate. The CV-ON switch turns the control voltage on/off. a transistor is used as a LED driver for the optocoupler.
Mask (bottom): File:Micronoise pro pcb.pdf
Parts (top): File:Micronoise pro parts.pdf
Micronoise pro in a case with additional 4 switches for routing signals of the NAND gates to the control voltage in. There is also a DIP socket for chosing the NAND gate that is controlled by the control voltage.
For this micronoise pro a laser cuted plexi front plate was used. The pads of the NAND gates output were connected to 4 LED with different colors to get a visual feedback of the sound.