2 layers75.2 × 47.2 mm
Adsr envelope generator
michd/modular-synth
Building a hardware modular synthesizer, this is where I'll collect module schematics and hardware designs.
89 parts20
2 layers149.3 × 104.5 mm
Sequencer
michd/modular-synth20Building a hardware modular synthesizer, this is where I'll collect module schematics and hardware designs.
- Size
- 149.3 × 104.5 mm
- Copper layers
- 2
- Thickness
- 1.6 mm
- Parts
- 132
- Nets
- 133
- Pads
- 600
- Tracks, vias
- 2,694, 256
- Pours
- 2
- Routed
- Yes
- KiCad
- KiCad 4
- Created
- 18 Jul 2015
- Updated
- 22 Nov 2020
Overview
Sequencer is an open-source printed circuit board by michd, from the michd/modular-synth repository on GitHub. It is a 2-layer board of 149.3 × 104.5 mm with 132 parts on 133 nets, routed with 2,694 tracks and 256 vias.
It is built around the MAX7221CWG+, MCP3202-CI/P and MCP4921-E/P, with the CD4051, ATMEGA32U4 and MC14551BD among its other parts. Its parts include 32 resistors, 25 capacitors, 21 switches, 11 ICs and 10 transistors. It belongs with the audio and music boards and the AVR (ATmega, ATtiny) boards of this library.
Main components
10
MAX7221CWG+
SOIC-24-300mil0℃~+70℃ 10MHz 4-Wire Serial Interface 4V~5.5V Adjustable Glow、Common Cathode SOIC-24-300mil Digital Tube Drivers ROHSMaxim Integrated (Analog Devices)Digital Tube Drivers
MCP3202-CI/P
PDIP-8-40℃~+85℃ 12 2 2.7V~5.5V 2LSB 50kHz、100kHz 5uA 900kHz、1.8MHz External External No SAR SPI PDIP-8 Analog to Digital Converters (ADC) ROHSMicrochip TechnologyAnalog To Digital Converters (ADC)MCP4921-E/P
PDIP-8-40℃~+125℃ 1 12 12LSB 2.7V~5.5V 4.5us Integrated buffer、Power-on reset、Power-down mode、Programmable gain SPI Voltage Buffer PDIP-8 Digital to Analog Converters (DAC) ROHSMicrochip TechnologyDigital To Analog Converters (DAC)
CD4051
TSSOP-16-40℃~+85℃ 115Ω 15ns 280ns 3V~9V 8:1 TSSOP-16 Analog Switches, Multiplexers ROHSWuxi I-core ElecAnalog Switches, Multiplexers
ATMEGA32U4
UncategorisedUnknown maker
MC14551BD
SOIC-16-55℃~+125℃ 10pF 15ns 17MHz 3V~18V 4 4:1 80Ω SOIC-16 Analog Switches, Multiplexers ROHSonsemiAnalog Switches, Multiplexers
MCP23S17-E/SO
SOIC-28-300mil-40℃~+125℃ 1.8V~5.5V 10MHz 16 1uA 600mV 8 8mA Interrupt Output Reset function、Cascading and address extension SPI SOIC-28-300mil I/O Expanders ROHSMicrochip TechnologyI/O Expanders
TS12A4517D
SOIC-8-40℃~+85℃ -6V~-1V、1V~6V 1 1:1 25Ω 464MHz 50ns 85ns SOIC-8 Analog Switches, Multiplexers ROHSTexas InstrumentsAnalog Switches, Multiplexers
MMBT3906
SOT-23-55℃~+150℃ 1 PNP 100 100nA 200mA 200mW 300MHz 300mV 40V 5V PNP SOT-23 Bipolar (BJT) ROHSTWGMCBipolar (BJT)MMBT3904
SOT-23-55℃~+150℃ 1 NPN 100 100nA 200mA 200mW 300MHz 300mV 40V 6V NPN SOT-23 Bipolar (BJT) ROHSJiangsu Changjing Electronics Technology (CJ)Bipolar (BJT)
README
README.mdModular Synthesizer
My fiancee and I plan to build a modular synthesizer, for fun. Here's a repository to hold all kinds of stuff to do with that. I imagine it'll hold the following
- Schematic designs
- PCB designs derived from those schematic design
- Some 3D modeling for related hardware
- Any microcontroller code
Parts
132| Qty | Value | Footprint | References |
|---|---|---|---|
| 14 | 10k | Resistors_SMD:R_0603 | R3, R10, R11, R12, R14, R15, R16, R18, R20, R21, R22, R24, R26, R27 |
| 12 | 10u | Capacitors_SMD:C_0805 | C5, C6, C7, C8, C9, C10, C11, C12, C14, C16, C24, C25 |
| 10 | SW_PUSH_SMALL_H | Buttons_Switches_ThroughHole:SW_PUSH_6mm | SW1, SW2, SW3, SW4, SW5, SW6, SW7, SW8, SW9, SW10 |
| 9 | 100k | Potentiometers:Potentiometer_Bourns_PTV09A-1_Horizontal | RV2, RV4, RV5, RV7, RV8, RV11, RV13, RV14, RV15 |
| 9 | MMBT3906 | TO_SOT_Packages_SMD:SOT-23 | Q2, Q3, Q4, Q5, Q6, Q7, Q8, Q9, Q10 |
| 8 | 100k | Bourns PTL:Bourns-PTL30-X | RV3, RV6, RV9, RV12, RV16, RV17, RV18, RV19 |
| 8 | 1k, .1% | Resistors_SMD:R_0805 | R4, R5, R8, R13, R19, R23, R25, R28 |
| 8 | SW_PUSH_DPDT | 6-pin-momentary-push-button:6-pin-momentary-push-button | SW13, SW14, SW15, SW16, SW17, SW18, SW20, SW21 |
| 6 | 100n | Capacitors_SMD:C_0402 | C13, C15, C17, C19, C21, C23 |
| 3 | CONN_02X03 | Pin_Headers:Pin_Header_Straight_2x03_Pitch2.54mm | P2, P4, P5 |
| 3 | LED | LEDs:LED_D3.0mm | D1, D2, D3 |
| 2 | 100k | Resistors_SMD:R_1206 | R7, R9 |
| 2 | 1k | Resistors_SMD:R_1206 | R31, R32 |
| 2 | 1u | Capacitors_SMD:C_0805 | C20, C22 |
| 2 | 22p | Capacitors_SMD:C_0603 | C1, C2 |
| 2 | 470u | Capacitors_ThroughHole:CP_Radial_D8.0mm_P3.50mm | C3, C4 |
| 2 | CD4051 | SMD_Packages:SO-16-N | U6, U7 |
| 2 | CONN_01X03 | Connectors_Molex:Molex_KK-6410-03_03x2.54mm_Straight | P1, P3 |
| 1 | 100R | Resistors_SMD:R_1206 | R2 |
| 1 | 1k | Potentiometers:Potentiometer_Triwood_RM-065 | RV1 |
| 1 | 20k | Resistors_SMD:R_0603 | R6 |
| 1 | 220k | Resistors_SMD:R_0805 | R30 |
| 1 | 22k | Resistors_SMD:R_1206 | R1 |
| 1 | 2k2 | Resistors_SMD:R_1206 | R17 |
| 1 | 330R | Resistors_SMD:R_0603 | R29 |
| 1 | 330n | Capacitors_SMD:C_0603 | C18 |
| 1 | 3k3 | Potentiometers:Potentiometer_Triwood_RM-065 | RV10 |
| 1 | 74LS138 | SMD_Packages:SO-16-N | U5 |
| 1 | ATmega32U4 | Housings_QFP:TQFP-44_10x10mm_Pitch0.8mm | U3 |
| 1 | CC04-41SURKWA | CC04-41SURKWA:CC04-41SURKWA | AFF1 |
| 1 | CONN_01X02 | Connectors_Molex:Molex_KK-6410-02_02x2.54mm_Straight | P6 |
| 1 | CRYSTAL_SMD2 | Crystals:Crystal_SMD_3225-4pin_3.2x2.5mm | X1 |
| 1 | CV2 | Measurement_Points:Measurement_Point_Round-SMD-Pad_Big | W1 |
| 1 | LED-BUTTON | 5GTH9:5GTH9 | SW11 |
| 1 | MAX7221 | SMD_Packages:SOIC-24 | U1 |
| 1 | MC14551B | SMD_Packages:SO-16-N | U11 |
| 1 | MCP23S17 | SMD_Packages:SOIC-28 | U2 |
| 1 | MCP3202 | SMD_Packages:SOIC-8-N | U10 |
| 1 | MCP4921 | SMD_Packages:SOIC-8-N | U4 |
| 1 | MMBT3904 | TO_SOT_Packages_SMD:SOT-23 | Q1 |
| 1 | PITCH_CV | Measurement_Points:Measurement_Point_Round-SMD-Pad_Big | W2 |
| 1 | STEP_SELECT | Measurement_Points:Measurement_Point_Round-SMD-Pad_Big | W3 |
| 1 | SWITCH_INV_MSM | MHS123K:MHS123K | SW12 |
| 1 | Switch_SPDT_x2 | Pin_Headers:Pin_Header_Straight_1x03_Pitch2.54mm | SW19 |
| 1 | TL074 | SMD_Packages:SOIC-14_N | U8 |
| 1 | TS12A4517 | SMD_Packages:SOIC-8-N | U9 |
Questions
How big is the Sequencer PCB?
It measures 149.3 × 104.5 mm and has 2 copper layers, 1.6 mm thick.
What parts does the Sequencer use?
132 parts, built around the MAX7221CWG+, MCP3202-CI/P, MCP4921-E/P and CD4051. The full list of its parts is on this page, with links to each part's symbol and footprint where PCBKit's library has them.
Where can I download the Sequencer KiCad files?
From the michd/modular-synth repository on GitHub, at the commit this page was made from: the board is modules/sequencer/kicad/sequencer.kicad_pcb. PCBKit opens the board in the browser, with nothing to install.
Can I use the Sequencer design in my own project?
Its repository states no licence, so its author keeps all rights: ask michd before reusing the design.
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