16 Step Sequencer (With improved PCB) (+/9V to +/-15V)
Article by Ray Wilson
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| 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.
Buy 16 Step Sequencer (With improved PCB) PC Boards via PayPal
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Tired of etchant eating your hands and the tedious work of drilling hundreds of
tiny holes. Tired of that tingly guilty feeling you get as you flush ferric
chloride into the environment. Then buy a ready-to-go, super high quality PC
Board!
Purchase Printed Circuit Boards online! Click the Add To Cart button to
make a purchase or go to PayPal
to sign up for a PayPal account. You can also set the number of boards you
would like to buy on the PayPal shopping cart page.
Please note that you are buying an un-populated PC board
only. The glass epoxy, double sided, plated through-hole PC board is
professionally manufactured, pre-drilled and silk-screened with a parts layout
legend. You must purchase all of the parts for the project and build it
yourself. But since that is the whole idea behind DIY (Do It Yourself) that's a
good thing.
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16 Step Sequencer (With improved PCB) PC Board Size (6.3" x 3.3")
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16 Step Sequencer Analog Board PC Board Size (5.5" x 2.6")
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(1) 16 Step Analog Sequencer PC Board Set (1 DIGITAL and 1 ANALOG board) $33.00
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(1) 16 Step SEQUENCER DIGITAL CONTROL PC Board $20.00
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(1) 16 Step SEQUENCER ANALOG PC Board $15.00
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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 |
| 2 | Ceramic Capacitor(s) | .001uF | C14, C12, C13, C18 |
| 5 | Ceramic Capacitor(s) | .01uF | C22, C23, C1, C3, C8, C7, C15, C16 |
| 1 | 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 | 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 | 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 | 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):
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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