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 These projects have ALL been superceded by new and better designs.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.

Sample & Hold and White Noise Generator

Here is the schematic, PC board layout, and parts placement. Always breadboard first! Have fun.

Sample & Hold and White Noise Generator Circuit Schematic

Sample Rate Indicator Mod (not on PCB)

Sample & Hold and White Noise Generator PCB Layout (Component Side View)

Sample & Hold and White Noise Generator Parts Layout

Sample & Hold and White Noise Generator Parts List
(Thanks to Colin Raffel)

Qty Description Value Name
1 Linear Pot 100k R1
1 Resistor, 1/4 Watt 33k R2
11 Resistor, 1/4 Watt 100k R3, R4, R5, R7, R13, R14, R16, R17, R19, R23, R25
1 Resistor, 1/4 Watt 27k R6
1 Resistor, 1/4 Watt 2k R8
2 Linear Pot 1M R9, R12
1 Resistor, 1/4 Watt 10k R10
1 Resistor, 1/4 Watt 470k R11
1 Resistor, 1/4 Watt 47k R15
2 Trimpot, Vert adj 1M R18, R26
5 Resistor, 1/4 Watt 1k R20, R24, R27, R28, R30
2 Resistor, 1/4 Watt 1M R21, R22
1 Resistor, 1/4 Watt 2M R29
1 Nonpolarized Cap .033uF C1
1 Nonpolarized Cap 1uF C2
3 Nonpolarized Cap 100pF C3, C14, C15
8 Nonpolarized Cap .1uF C4, C6, C8, C9, C10, C11, C12, C13
2 Polarized Cap 10uF C5, C7
1 Nonpolarized Cap 470pF C11
3 High Speed Diode 1n914 CR1, CR2, CR3
1 Zener Diode 1n4744 Z1
2 Dual Op Amp TL082 IC1, IC5
1 Quad Op Amp TL084 IC2
1 Quad Switch CD4016 IC3
1 Quad Schmitt Trig CD40106 IC4