2 layers38.1 × 50.8 mm
2 layers50.8 × 63.5 mm
SAO Core4
ageppert/SAO_CORE420A Nibble of Core Memory
- Size
- 50.8 × 63.5 mm
- Copper layers
- 2
- Thickness
- 1.6 mm
- Parts
- 92
- Nets
- 75
- Pads
- 251
- Tracks, vias
- 748, 97
- Routed
- Yes
- KiCad
- KiCad 8.0 (file 20240108)
- Created
- 14 Aug 2024
- Updated
- 29 May 2026
Overview
SAO Core4 is an open-source printed circuit board by ageppert, from the ageppert/SAO_CORE4 repository on GitHub. It is a 2-layer board of 50.8 × 63.5 mm with 92 parts on 75 nets, routed with 748 tracks and 97 vias.
It is built around the LM393, SN74HC02DR(LX) and SSP9193-33M5R, with the MMBT4403LT1G, SFH11-NBPC-D03-ST-BK and SL3401A among its other parts. Its parts include 32 resistors, 12 transistors, 10 capacitors, 4 ICs and 4 diodes.
Main components
6
LM393
SOP-8-16V~16V 0℃~+70℃ 2 2.5mA 250nA 2V~36V 36V 5mV 5nA Fail-safe function Open-drain SOP-8 Comparators ROHSMSKSEMIComparators
SN74HC02DR(LX)
SOP-14Logic Gateslingxingic
SSP9193-33M5R
SOT-23-5-40℃~+85℃@(Ta) 1 170mV@(200mA) 27uVrms 3.3V 30uA 400mA 5.5V 70dB@(10kHz) Fixed Over Current Protection、Enable、Short Circuit Protection Positive SOT-23-5 Voltage Regulators - Linear, Low Drop Out (LDO) Regulators ROHSShanghai Siproin MicroelectronicsVoltage Regulators - Linear, Low Drop Out (LDO) Regulators
MMBT4403LT1G
SOT-231 PNP 100nA 200MHz 300 300mW 400mV、750mV 40V 5V 600mA PNP SOT-23 Bipolar (BJT) ROHSRUILONBipolar (BJT)
SFH11-NBPC-D03-ST-BK
插件,P=2.54mm-40℃~+105℃ 2 2.54mm 2.54mm 3A 6P 8.51mm Brass Gold Square Hole Through Hole 插件,P=2.54mm Female Headers ROHSSullins Connector SolutionsFemale HeadersSL3401A
SOT-23-55℃~+150℃ 1 P-Channel 1.4W 115pF 2V 30V 4.2A 85mΩ@2.5V 954pF P-Channel SOT-23 MOSFETs ROHSSlkorMOSFETs
README
README.mdSAO_CORE4
A Nibble of Core Memory
Follow this project at: https://hackaday.io/project/197235-sao-core4-a-nibble-of-core-memory-with-i2c
Hardware Version 0.2.0 - Work in progres - reducing board size - add button - simplify.
Hardware Version 0.1.1 hand reworked prototype, simplified and re-routed row drive transistor signals to simplify firmware development. This is the version that is currently the functional prototype. These changes will be in 0.2.0.
Hardware Version 0.1 as prototyped
Hardware Version 0.1 render
Parts
92| Qty | Value | Footprint | References |
|---|---|---|---|
| 11 | 470 | Resistor_SMD:R_0805_2012Metric | R1, R2, R3, R4, R5, R6, R13, R14, R17, R18, R28 |
| 5 | MMBT4401LT1G | digikey-footprints:SOT-23-3 | Q2, Q4, Q6, Q14, Q18 |
| 5 | MMBT4403LT1G | digikey-footprints:SOT-23-3 | Q1, Q3, Q5, Q13, Q17 |
| 4 | 120 | Resistor_SMD:R_0805_2012Metric | R60, R61, R62, R63 |
| 4 | 1K2 | Resistor_SMD:R_0805_2012Metric | R30, R31, R54, R55 |
| 4 | LED | Andy_Footprint_Library:LED_1206_3216Metric_RevMnt_Hole1.8x2.4mm_custom | D1, D2, D3, D4 |
| 3 | 0.1uF | Capacitor_SMD:C_0805_2012Metric | C2, C17, C19 |
| 3 | 1K5-1% | Resistor_SMD:R_0805_2012Metric | R47, R50, R53 |
| 3 | 220uF | Capacitor_SMD:C_1206_3216Metric | C13, C14, C15 |
| 2 | 0 | Resistor_SMD:R_0805_2012Metric | R32, R33 |
| 2 | 11-1% | Resistor_SMD:R_0805_2012Metric | R49, R52 |
| 2 | 1K8-1% | Resistor_SMD:R_0805_2012Metric | R48, R51 |
| 2 | 1uF | Capacitor_SMD:C_0805_2012Metric | C10, C12 |
| 2 | 4K7 | Resistor_SMD:R_0805_2012Metric | R27, R44 |
| 2 | 8R2-5% | Resistor_SMD:R_0805_2012Metric | R7, R21 |
| 2 | CM_SNS_SEL | Jumper:SolderJumper-3_P1.3mm_Bridged12_Pad1.0x1.5mm | JP24, JP25 |
| 2 | SAO_conn_SFH11-NBPC-D03-ST-BK | Andy_Footprint_Library:Badgelife-SAOv169-BADGE-2x3 | X1, X2 |
| 1 | 0.01uF | Capacitor_SMD:C_0805_2012Metric | C11 |
| 1 | 10uF | Capacitor_SMD:C_0805_2012Metric | C18 |
| 1 | 3V3_CUR_MON | Jumper:SolderJumper-2_P1.3mm_Bridged_RoundedPad1.0x1.5mm | JP17 |
| 1 | A0 | Jumper:SolderJumper-3_P1.3mm_Bridged12_Pad1.0x1.5mm | JP30 |
| 1 | A1 | Jumper:SolderJumper-3_P1.3mm_Bridged12_Pad1.0x1.5mm | JP31 |
| 1 | A2 | Jumper:SolderJumper-3_P1.3mm_Bridged12_Pad1.0x1.5mm | JP32 |
| 1 | CORE_CURR_MON | Jumper:SolderJumper-2_P1.3mm_Bridged_RoundedPad1.0x1.5mm | JP3 |
| 1 | Core_Memory_2x2_Matrix_Front_Facing | Andy_Footprint_Library:core_4_6.75mm_square_front_facing | CM1 |
| 1 | G*** | kibuzzard-66C5FD67 | kibuzzard-66C5FD67 |
| 1 | G*** | kibuzzard-6417AF30 | kibuzzard-6417AF30 |
| 1 | G*** | kibuzzard-66C119C9 | kibuzzard-66C119C9 |
| 1 | G*** | kibuzzard-66C5FD34 | kibuzzard-66C5FD34 |
| 1 | G*** | kibuzzard-64178DE8 | kibuzzard-64178DE8 |
| 1 | G*** | kibuzzard-64178E7C | kibuzzard-64178E7C |
| 1 | G*** | kibuzzard-64178DF4 | kibuzzard-64178DF4 |
| 1 | G*** | kibuzzard-66BCB8D2 | kibuzzard-66BCB8D2 |
| 1 | GPB6 | Andy_Footprint_Library:TestPoint_THTPad_D1.5mm_Drill1.0mm | TP6 |
| 1 | GPB7 | Andy_Footprint_Library:TestPoint_THTPad_D1.5mm_Drill1.0mm | TP7 |
| 1 | INTA | Jumper:SolderJumper-2_P1.3mm_Open_Pad1.0x1.5mm | JP22 |
| 1 | INTB | Jumper:SolderJumper-2_P1.3mm_Open_Pad1.0x1.5mm | JP23 |
| 1 | LM393 | Andy_Footprint_Library:SOIC-8_W3.9mm | U9 |
| 1 | MCP23017_SS | Package_SO:SSOP-28_5.3x10.2mm_P0.65mm | U11 |
| 1 | QWIIC | Connector_JST:JST_SH_SM04B-SRSS-TB_1x04-1MP_P1.00mm_Horizontal | X9 |
| 1 | Q_NMOS_DGS_AO3400A | digikey-footprints:SOT-23-3 | Q21 |
| 1 | S1 IN | TestPoint:TestPoint_Pad_1.5x1.5mm | TP20 |
| 1 | S1 OUT | TestPoint:TestPoint_Pad_1.5x1.5mm | TP23 |
| 1 | S2 IN | TestPoint:TestPoint_Pad_1.5x1.5mm | TP21 |
| 1 | S2 OUT | TestPoint:TestPoint_Pad_1.5x1.5mm | TP22 |
| 1 | SL3401A | digikey-footprints:SOT-23-3 | Q22 |
| 1 | SN74HC02DR | Package_SO:SOIC-14_3.9x8.7mm_P1.27mm | U10 |
| 1 | SSP9193-33M5R | Package_TO_SOT_SMD:SOT-23-5 | U7 |
| 1 | V_SEL | Jumper:SolderJumper-3_P1.3mm_Bridged12_Pad1.0x1.5mm | JP21 |
| 1 | ~ | Andy_Footprint_Library:Machine_Ideas_logo | L2 |
| 1 | ~ | Andy_Footprint_Library:Core4_w_core_symbol | L1 |
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Questions
How big is the SAO Core4 PCB?
It measures 50.8 × 63.5 mm and has 2 copper layers, 1.6 mm thick.
What parts does the SAO Core4 use?
92 parts, built around the LM393, SN74HC02DR(LX), SSP9193-33M5R and MMBT4403LT1G. 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 SAO Core4 KiCad files?
From the ageppert/SAO_CORE4 repository on GitHub, at the commit this page was made from: the board is Electronic Design/SAO_Core4_V0.1 Design Files KiCAD 8/SAO_Core4.kicad_pcb and its schematic Electronic Design/SAO_Core4_V0.1 Design Files KiCAD 8/SAO_Core4.kicad_sch. PCBKit opens the board in the browser, with nothing to install.
Can I use the SAO Core4 design in my own project?
Its repository states no licence, so its author keeps all rights: ask ageppert before reusing the design.