Micronoise pro

Concept

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 sounds or polyrhythmic beats.

Parts

• 1* 4093 IC

resistors (R3- R6 are just bridges you can also use wires, one of the resistors is connected to the optocoupler)

• R1 470
• R2 8.2k
• R3 10
• R4 10
• R5 10
• 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)
• 2 Potentiometers 10 kOhm (Alps PCB mounted)
• 1* BC548 Transistor (or similar)
• 1* LED(for optocoupler)
• 1* LDR(for optocoupler)
• 1* Battery Clip
• Battery
• 3* Jack connector (lumberg 1502 03 PCB mounted)

Schematics

The two NAND gates are certainly put together in a weird way. I actualy havent got much of an idea, what it does. But because of the nice sound of this circuit, the microNAND will remain as it is. The other two NANDs just create rectangles that you can tune with the potis. The first Oscillator also triggers the second. You can attach a Piezo or a jack connector on the pins P$1 and P$3 on the right. As Vcc anything from 3 - 15 V should work. I've just tried 9V so far, though.

Board

So far, only a through hole board exists. But I'm working on the pseudo SMD variant (no more drilling!).

Mask (bottom): File:MicroRingBoardv02.pdf

Parts (top): File:MicroRingBoardPartsv02.pdf