CAVE PROJECT! This information is here to support people who have been making MFOS gear since I started posting synth-diy information back in about 2002 or 2003. These projects have ALL been superceded by new and better designs. I do not recommend that you make these since they have been improved over the years. I am not providing any support for these projects beyond publishing this historical information.
This is an intermediate to advanced project and I do not recommend it as a first project if you are just getting started in synths or electronics. Only the circuit and some explanation are shown here. A lot of project building experience and electronics knowledge and equipment ownership (scope, meters, etc.) is taken for granted. If you are interested in building this project please read the entire page before ordering PC boards to ensure that the information provided is thorough enough for you to complete the project successfully.

Ray's "Pink Enough For Me" Noise Generator

Here is a circuit board for this. I made it skinny so I could fit it onto another board I was making that had some room left. When I was building this I noticed that I had to increase the gain of the circuit so I reduced the value of R3 to 500 ohms. I also buffered the outputs as you can see from the board.

Just put pink noise into one side of the buffer and white noise into the other and voila you have 4 noise sources (more than you will probably ever need). The buffer is not shown in the schematic but it is quite simple in that its just four non-inverting unity gain buffers with the non-inverting inputs of two pairs tied together.

"Pink Enough For Me" Noise Generator Schematic

"Pink Enough For Me" Noise Generator
PCB (including buffer circuit) Parts Side Shown


"Pink Enough For Me" Noise Generator
Parts Placement (including buffer circuit)

Remember to connect the power connections between the boards.

Ray's "Pink Enough For Me" Noise Generator Project Parts List

Qty. Description Value Designators
1   1/4 Watt 1% Resistor   100K   R4  
1   1/4 Watt 1% Resistor   10K   R6  
3   1/4 Watt 1% Resistor(s)   1K   R8, RP, RW  
1   1/4 Watt 1% Resistor   200K   R10  
2   1/4 Watt 1% Resistor(s)   2Meg   R2, R5  
2   1/4 Watt 1% Resistor(s)   4.7Meg   R1, R7  
1   1/4 Watt 1% Resistor   47K   R9  
1   1/4 Watt 1% Resistor   500 ohm   R3  
2   Battery(s)   9 Volts   B1, B2  
1   Ceramic Capacitor   0.001uF   C6  
3   Ceramic Capacitor(s)   0.22uF   C4, C7, C3  
1   Ceramic Capacitor   1uF   C8  
1   Ceramic Capacitor   220pF   C5  
2   Electrolytic Capacitor(s)   100uF   C2, C1  
1   NPN Transistor   2N2712   Q1  
1   Operational Amplifier   TL082   IC1-A, IC1-B  
1   Phone Jack   1/4" Jack   J1, J1