16 Step Sequencer (With improved PCB) (+/-9V to +/-15V)
Article by Ray Wilson
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Sequencer Videos on YouTube
| Thomas White used the MFOS sequencer boards to produce this incredible rotary sequencer. Visit his site to keep up with his latest awesome projects. |
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Features
- Improved PC board (far less kludging).
- Produces sequences of 4 to 16 steps in length
- Modes include stop at count, reverse at count,
reset at count and random 16 mode
- Each step has coarse tune, fine tune, and switchable gate
- Accepts external clock and external start pulse.
- Simultaneous outputs with and without portamento.
- Forward, Back, and Reset controls ease sequence set up.
Introduction
Please see the pages at
16 Step Analog Sequencer Circuit for details regarding circuit descriptions etc. This page is here
soley as a vehicle to present the new PC boards and support board purchases.
The schematic and PCBs presented here incorporate all
of the improvements and modifications shown on the previous sequencer pages. Panel to board wiring is
presented here. Please browse the entire page before ordering board to ensure you understand the circuit
and there is enough information provided here for you to successfully complete the project prior to purchasing
PC boards. Thanks.
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This is an advanced project and I do not recommend it
as an intermediate or 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.
16 Step Sequencer Digital Board Information
16 Step Sequencer (With improved PCB) Schematic Page 1 PDF
16 Step Sequencer (With improved PCB) Schematic Page 2 PDF
16 Step Sequencer (With improved PCB) Schematic Page 3 PDF
16 Step Sequencer (With improved PCB) Panel Wiring PDF
16 Step Sequencer (With improved PCB) Board to Panel Wiring PDF
16 Step Sequencer (With improved PCB) Digital Board Parts List
| Qty. | Description | Value | Designators |
|---|
| 3 | CD40106(s) | CD40106 | U2, U1, U6 |
| 1 | CD4013 Dual D Flip Flop B | CD4013-B | U3 |
| 1 | CD40193 4 Counter | CD40193 | U4 |
| 1 | CD4094 8 Stage Shift/Store Reg | CD4094 | U8 |
| 1 | CD4514 4 Bit Latched 4 Dec. | CD4514 | U5 |
| 1 | TL082 Dual Op Amp | TL082 | U7 |
| 17 | LED(s) | General Purpose LED | LED1, LED5, LED3, LED9, LED7, LED13, LED11, LED17, LED15, LED4, LED2, LED8, LED6, LED12, LED10, LED16, LED14 |
| 31 | 1N914 Sw. Diode(s) | General purpose high speed switching diode | D2, D5, D6, D7, D1, D11, D3, D4, D8, D31, D9, D15, D12, D19, D17, D23, D21, D27, D25, D26, D24, D22, D20, D16, D18, D14, D10, D13, D28, D29, D30 |
| 1 | 2N3904 | 2N3904 | Q1 |
| 1 | Tantalum Capacitor | 1uF | C10 |
| 4 | Ceramic Capacitor(s) | .001uF | C14, C12, C13, C18 |
| 8 | Ceramic Capacitor(s) | .01uF | C22, C23, C1, C3, C8, C7, C15, C16 |
| 5 | Ceramic Capacitor | .022uF | C9, C2, C4, C5, C6 |
| 2 | Ceramic Capacitor(s) | .1uF | C19, C24 |
| 1 | Ceramic Capacitor | 100pF | C17 |
| 1 | Ceramic Capacitor | 47pF | C11 |
| 2 | Electrolytic Capacitor(s) | 10uF | C20, C21 |
| 1 | Linear Potentiometer | 1M | R19 |
| 8 | Resistor 1/4 Watt 5%(s) | 100K | R47, R9, R46, R44, R45, R28, R26, R32 |
| 7 | Resistor 1/4 Watt 5%(s) | 10K | R1, R5, R10, R11, R17, R20, R39 |
| 4 | Resistor 1/4 Watt 5%(s) | 1K | R42, R41, R29, R27 |
| 4 | Resistor 1/4 Watt 5%(s) | 1M | R13, R14, R33, R38 |
| 1 | Resistor 1/4 Watt 5% | 20K | R18 |
| 4 | Resistor 1/4 Watt 5%(s) | 220K | R7, R3, R16, R21 |
| 2 | Resistor 1/4 Watt 5%(s) | 2M | R31, R35 |
| 1 | Resistor 1/4 Watt 5% | 3.9K | R43 |
| 2 | Resistor 1/4 Watt 5%(s) | 3K | R24, R30 |
| 3 | Resistor 1/4 Watt 5%(s) | 4.7K | R25, R37, R34 |
| 1 | Resistor 1/4 Watt 5% | 4.7M | R36 |
| 4 | Resistor 1/4 Watt 5%(s) | 47K | R40, R12, R8, R4 |
| 1 | Resistor 1/4 Watt 5% | 6.2K | R23 |
| 4 | Resistor 1/4 Watt 5%(s) | 680K | R2, R6, R15, R22 |
| 1 | 12 Pole Rotary Switch | SP12T | S9 |
| 1 | 1P4T Selector Switch | SP4T | S25 |
| 1 | DPDT Switch | DPDT | S12 |
| 4 | SPST PB Switch(s) | SPST | S1, S2, S3, S4 |
| 16 | SPDT Switch (used to accomodate the gate diode and LED wiring) | SPDT | S5, S7, S10, S13, S17, S19, S21, S23, S6, S8, S11, S14, S18, S20, S22, S24 |
16 Step Sequencer Analog Board Information
16 Step Sequencer (With improved PCB) Analog Board Schematic PDF
| Either 2.5 Volt Reference chip will work. |
 |
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16 Step Sequencer (With improved PCB) Panel Wiring Diagram PDF
16 Step Sequencer (With improved PCB) Gate Switch Wiring Detail PDF
16 Step Sequencer (With improved PCB) Board to Panel Wiring Labels PDF
16 Step Sequencer Analog Board Analog Board Parts List
| Qty. | Description | Value | Designators |
|---|
| 1 | CD4067 Analog Mux/DeMux | CD4067 | U2 |
| 1 | TL082 Dual Op Amp | TL082 | U3 |
| 1 | TL084 Quad Op Amp | TL084 | U1 |
| 1 | LM336 2.5V Ref. | LM336-2.5V | VS1 |
| 32 | Linear Potentiometer(s) (don't forget to buy knobs) | 100K (up to 500K will work fine.) | R11, R19, R32, R38, R46, R54, R63, R69, R4, R8, R18, R35, R44, R53, R62, R13, R22, R40, R34, R48, R57, R71, R66, R7, R15, R30, R24, R42, R50, R67, R59, R28 |
| 1 | Linear Potentiometer | 1M | R51 |
| 18 | Resistor 1/4 Watt 1%(s) | 100K | R10, R31, R45, R17, R36, R12, R33, R47, R65, R6, R41, R58, R5, R52, R23, R64, R26, R73 |
| 3 | Resistor 1/4 Watt 1%(s) | 10K | R74, R72, R1 |
| 1 | Resistor 1/4 Watt 1% | 200K | R25 |
| 1 | Resistor 1/4 Watt 1% | 22 ohms | R75 |
| 16 | Resistor 1/4 Watt 1%(s) | 2M | R27, R20, R37, R68, R21, R39, R70, R14, R29, R49, R9, R60, R55, R61, R56, R43 |
| 2 | Resistor 1/4 Watt 1%(s) | 47K | R3, R2 |
| 2 | Ceramic Capacitor(s) | 0.1uF | C4, C1 |
| 2 | Ceramic Capacitor(s) | 470pF | C6, C5 |
| 2 | Electrolytic Capacitor(s) | 100uF | C3, C2 |
Parts Layouts (click image for PDF):
Panel Overlays (click image for PDF):
PCB Images X2 Artwork GIF files
By the time you've etched (double sided by the way) and drilled (587 holes) these boards yourself
you'll wonder why you didn't buy the professionally manufactured, glass epoxy, plated through-hole,
double sided, soldermasked, silk screened legend board from me. But have at it...
These X2 images are provided for individual use and not for mass production or sale.
Miscellaneous
- 1/16" to 1/10" Thick aluminum plates for mounting the pots and switches.
- Wood or plastic to build a case with.
- Assorted hardware 1" 6-32 nuts and bolts, 1/2" #8 wood screws, etc
- Knobs for potentiometers, wire and solder.
- Digital Volt Meter and a Signal Tracer or oscilloscope for testing.
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