4 layers38.1 × 100 mm
4 layers27.9 × 108 mm
Cheep3a
emeb/cheep3a9An inexpensive Eurorack audio generator
- Size
- 27.9 × 108 mm
- Copper layers
- 4
- Thickness
- 1.56 mm
- Parts
- 85
- Nets
- 68
- Pads
- 270
- Tracks, vias
- 486, 58
- Pours
- 3
- Routed
- Yes
- KiCad
- KiCad 6 (file 20211014)
- Created
- 25 Jul 2023
- Updated
- 27 Jul 2023
Overview
Cheep3a is an open-source printed circuit board by emeb, from the emeb/cheep3a repository on GitHub, published under the MIT licence. It is a 4-layer board of 27.9 × 108 mm with 85 parts on 68 nets, routed with 486 tracks and 58 vias.
It is built around the CH32V003F4U6, MCP6004-I/ST and PT8211-S, with the TL072CDT, BCT2028EUK33-TR and LM4040C50FTA among its other parts. Its parts include 29 resistors, 27 capacitors, 9 connectors, 7 ICs and 3 diodes. It belongs with the audio and music boards and the RISC-V boards of this library.
Main components
12
CH32V003F4U6
QFN-20(3X3)16KB 18 48MHz Others QFN-20(3X3) Microcontrollers (MCU/MPU/SOC) ROHSWCH (Nanjing Qinheng Microelectronics)Microcontrollers (MCU/MPU/SOC)
MCP6004-I/ST
TSSOP-14-40℃~+125℃ 1.8V~5.5V 100uA 1MHz 1pA 1pA 23mA 28nV/√Hz@1kHz 2uV/℃ 4 4.5mV 600V/ms 76dB Rail-to-Rail Input, Rail-to-Rail Output TSSOP-14 Operational Amplifier ROHSMicrochip TechnologyOperational Amplifier
PT8211-S
SOP-8-150mil16 2 3.3V Serial SOP-8-150mil Digital to Analog Converters (DAC) ROHSPTCDigital To Analog Converters (DAC)TL072CDT
SO-80℃~+70℃ 1.4mA 10uV/℃ 15nV/√Hz@1kHz 16V/us 2 20pA 3mV 40mA 4MHz 5pA 6V~36V 86dB Short-Circuit Protection、Built-in compensation、Latch-up suppression SO-8 FET Input Amplifiers ROHSSTMicroelectronicsFET Input Amplifiers
BCT2028EUK33-TR
SOT-23-5-40℃~+85℃@(Ta) 1 100uA 3.3V 5.5V 500mA 500mV@(500mA) 50uVrms 74dB@(1kHz) Fixed Over Current Protection、Over Temperature Protection、Enable Positive SOT-23-5 Voltage Regulators - Linear, Low Drop Out (LDO) Regulators ROHSBROADCHIPLinear Voltage Regulators (LDO)
LM4040C50FTA
SOT-23-40℃~+125℃@(Ta) 100ppm/℃ 15mA 5V 74uA 80uVrms 83uA Fixed Parallel ±0.5% SOT-23 Voltage Reference ROHSDiodes IncorporatedVoltage Reference
ME6118A50B3G
SOT-223-40℃~+125℃ 1 18V 53uA 5V 60mV@(100mA) 800mA Fixed Over Current Protection、Over Temperature Protection Positive SOT-223 Voltage Regulators - Linear, Low Drop Out (LDO) Regulators ROHSMICRONEVoltage Regulators - Linear, Low Drop Out (LDO) Regulators
GZ2012D601TF
0805-55℃~+125℃ 1 300mΩ 500mA 600Ω@100MHz ±25% 0805 Ferrite Beads ROHSSunlordFerrite Beads
SS14
SMA(DO-214AC)-55℃~+150℃ 1A 25A 300uA@40V 40V 550mV@1A Independent SMA(DO-214AC) Schottky Diodes ROHSMDDSchottky Diodes
GZ1608D222TF
0603-55℃~+125℃ 1 1.2Ω 100mA 2.2kΩ@100MHz ±25% 0603 Ferrite Beads ROHSSunlordFerrite BeadsMMBT3904
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)
SX32Y024000BK1T
SMD3225-4P20pF 24MHz 40Ω SMD crystal oscillator ±10ppm ±15ppm SMD3225-4P Crystals ROHSTKDCrystals
README
hardware/README.mdHardware
This directory contains the KiCad project files for the Cheep3a hardware design.
Version
This is Version 0.2
- Version 0.1 of the design was fabbed and assembled by JLCPCB and several minor issues were discovered. These issues were corrected and the system performed as designed.
- Version 0.2 corrects the errors found in V0.1 but has not been built or tested.
Panel Design
The directory cheep3a_panel contains a front panel design for standard 3U
Eurorack mounting.
Parts
85| Qty | Value | Footprint | References |
|---|---|---|---|
| 10 | 0.1uf | Capacitor_SMD:C_0603_1608Metric | C1, C2, C3, C6, C7, C12, C13, C19, C22, C23 |
| 6 | 100k | Resistor_SMD:R_0603_1608Metric | R2, R4, R10, R11, R22, R23 |
| 6 | AudioJack2_SwitchT | emeb_library:Jack_3.5mm_QingPu_WQP-PJ398SM_Vertical_CircularHoles | J3, J4, J6, J7, J8, J9 |
| 4 | 12.5k | Resistor_SMD:R_0603_1608Metric | R16, R17, R18, R19 |
| 4 | 1uf | Capacitor_SMD:C_0603_1608Metric | C10, C11, C14, C26 |
| 3 | 10k | emeb_library:Potentiometer_TT_P0915N | RV1, RV2, RV3 |
| 3 | 10uf | Capacitor_SMD:C_0805_2012Metric | C15, C16, C18 |
| 3 | 180 | Resistor_SMD:R_0603_1608Metric | R8, R9, R15 |
| 3 | 1k | Resistor_SMD:R_0603_1608Metric | R27, R28, R29 |
| 3 | 330pf | Capacitor_SMD:C_0603_1608Metric | C8, C9, C17 |
| 3 | 33k | Resistor_SMD:R_0603_1608Metric | R6, R7, R14 |
| 3 | 49.9k | Resistor_SMD:R_0603_1608Metric | R3, R5, R12 |
| 2 | 100 | Resistor_SMD:R_0603_1608Metric | R24, R25 |
| 2 | 160pf | Capacitor_SMD:C_0603_1608Metric | C24, C25 |
| 2 | 27pf | Capacitor_SMD:C_0603_1608Metric | C4, C5 |
| 2 | 3.3nf | Capacitor_SMD:C_0603_1608Metric | C20, C21 |
| 2 | 50k | Resistor_SMD:R_0603_1608Metric | R20, R21 |
| 2 | GZ2012D601TF | Inductor_SMD:L_0805_2012Metric | FB1, FB2 |
| 2 | SS14 | Diode_SMD:D_SMA | D1, D2 |
| 1 | 1.5k | Resistor_SMD:R_0603_1608Metric | R1 |
| 1 | 10 | Resistor_SMD:R_0603_1608Metric | R26 |
| 1 | 10k | Resistor_SMD:R_0603_1608Metric | R13 |
| 1 | 10nf | Capacitor_SMD:C_0603_1608Metric | C27 |
| 1 | BCT2028EUK33 | Package_TO_SOT_SMD:SOT-23-5 | U6 |
| 1 | CH32V003F4U6 | Package_DFN_QFN:QFN-20-1EP_3x3mm_P0.4mm_EP1.65x1.65mm_ThermalVias | U1 |
| 1 | CLX6F-FKC | LED_SMD:LED_RGB_PLCC-6 | D3 |
| 1 | Conn_02x08_Odd_Even | emeb_library:con16_2X8_S4_TEC | J2 |
| 1 | GZ1608D222TF | Inductor_SMD:L_0603_1608Metric | FB3 |
| 1 | JST SH-4 (Qwiic) | emeb_library:JST_SH_SM04B-SRSS-TB_04x1.00mm_Angled | J5 |
| 1 | LM4040C50FTA | Package_TO_SOT_SMD:SOT-23 | U3 |
| 1 | MCP6004-I/ST | Package_SO:TSSOP-14_4.4x5mm_P0.65mm | U4 |
| 1 | ME6118A50B3G | Package_TO_SOT_SMD:SOT-223-3_TabPin2 | U5 |
| 1 | MMBT3904 | Package_TO_SOT_SMD:SOT-23 | Q1 |
| 1 | PROGRAM | Connector_PinHeader_2.54mm:PinHeader_1x04_P2.54mm_Vertical | J1 |
| 1 | PT8211-S | Package_SO:SO-8_3.9x4.9mm_P1.27mm | U2 |
| 1 | SW_Push | Button_Switch_THT:SW_PUSH_6mm | SW1 |
| 1 | SX32Y024000BK1T | Crystal:Crystal_SMD_3225-4Pin_3.2x2.5mm | Y1 |
| 1 | TL072CDT | Package_SO:SOIC-8_3.9x4.9mm_P1.27mm | U7 |
| 1 | Val** | emeb_library:avatar_small | Ref** |
Questions
How big is the Cheep3a PCB?
It measures 27.9 × 108 mm and has 4 copper layers, 1.56 mm thick.
What parts does the Cheep3a use?
85 parts, built around the CH32V003F4U6, MCP6004-I/ST, PT8211-S and TL072CDT. 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 Cheep3a KiCad files?
From the emeb/cheep3a repository on GitHub, at the commit this page was made from: the board is hardware/cheep3a.kicad_pcb and its schematic hardware/cheep3a.kicad_sch. PCBKit opens the board in the browser, with nothing to install.
Can I use the Cheep3a design in my own project?
Its repository publishes it under the MIT licence: you may reuse it on that licence's terms (keep the author's notice, and for a copyleft licence share your changes alike).
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