MCU BOARD
About the MCU BOARD
MCU BOARD is an open source PCB design by sparkletron, published on GitHub under the MIT license. It is a 2-layer board measuring 79.3 × 101.1 mm, with 83 components from 33 distinct parts.
Other key parts include the LM386, CD74HC4051E, AT89S51-33PU and SN74HC4060N. By type, the board carries 42 resistors, 26 capacitors, 5 transistors, 4 ICs, 3 connectors and 2 crystals.
From the project
Military Time Alarm Clock
Military Time Clock using the 89S51 microcontroller.
IMPORTANT: No build instructions are included. All parts needed are here, you're on your own.
- docs - Datasheets: Data documents for various ICs. - Manual: User manual for the clock. - schematic: KiCad schematic of Military Time Clock, including PCB design and bill of materials. - model - FreeCAD: Any FreeCAD models used in the project. - Inventor: Any Autodesk Inventor 2023 models used in the project (STL included). - src: Any source code for the project. - clock_sdcc: contains make file and code for the clock project.
Main components on the MCU BOARD
MCU BOARD bill of materials (BOM)
83 components, 33 distinct parts — part numbers from the project's BOM.
| Qty | Part | Footprint | Refs |
|---|---|---|---|
| 1 | LM386 Texas Instruments | DIP-8_W7.62mm_LongPads | U5 |
| 1 | CD74HC4051E 74HC4051 Texas Instruments | DIP-16_W7.62mm_Socket_LongPads | U6 |
| 1 | AT89S51-33PU AT89S51-24PU Microchip | DIP1556W56P254L5232H483Q40N | U7 |
| 1 | SN74HC4060N Texas Instruments | DIP-16_W7.62mm_LongPads | U9 |
| 5 | 2N3904TFR 2N3904 onsemi | TO-92_Wide | Q1, Q2, Q3, Q4, Q5 |
| 1 | AB38T-32.768KHZ 32.768Khz Abracon | Crystal_C38-LF_D3.0mm_L8.0mm_Horizontal | Y1 |
| 1 | ATS120B-E 12Mhz CTS-Frequency Control | Crystal_HC49-U_Vertical | Y2 |
| 1 | Speaker_Conn_01x02 | Molex_KK-254_AE-6410-02A_1x02_P2.54mm_Vertical | J2 |
| 1 | CON-SOCJ-2155 Barrel_Jack_Switch Gravitech | BarrelJack_Horizontal | J3 |
| 1 | 929500-01-36-RK Conn_01x27 3M | PinHeader_1x27_P2.54mm_Vertical | J4 |
| 1 | 861400011YO2LF TestPoint Amphenol ICC | PinHeader_1x01_P2.54mm_Vertical | TP1 |
| 1 | FG28C0G2A470JNT00 47pF TDK | C_Disc_D4.3mm_W1.9mm_P5.00mm | C1 |
| 1 | GKG30015 2-5pF EW Electronics | C_Rect_L7.0mm_W6.5mm_P5.00mm | C2 |
| 14 | FG28X7S2A104KRT06 100nF TDK | C_Disc_D4.3mm_W1.9mm_P5.00mm | C3, C4, C5, C6, C7, C8, C9, C10 +6 |
| 2 | SR151A180JAR 18pF KYOCERA AVX | C_Disc_D3.0mm_W1.6mm_P2.50mm | C11, C12 |
| 1 | ESK475M016AC3AA 4.7uF Kemet | CP_Radial_D5.0mm_P2.00mm | C13 |
| 1 | FG28C0G2A470JNT06 47nF TDK | C_Disc_D4.3mm_W1.9mm_P5.00mm | C14 |
| 2 | ESK337M6R3AE3AA 330uF Kemet | CP_Radial_D6.3mm_P2.50mm | C15, C16 |
| 1 | FG28X7R2A102KNT06 1nF TDK | C_Disc_D4.3mm_W1.9mm_P5.00mm | C20 |
| 1 | ESK476M6R3AC3AA 47uF Kemet | CP_Radial_D5.0mm_P2.00mm | C21 |
Show 13 more
| Qty | Part | Footprint | Refs |
|---|---|---|---|
| 1 | ESK106M016AC3KA 10uF Kemet | CP_Radial_D5.0mm_P2.00mm | C24 |
| 1 | FG28C0G2A180JNT00 8pF TDK | C_Disc_D4.3mm_W1.9mm_P5.00mm | C26 |
| 5 | CFR16J4K7 4k7 TE Connectivity Passive Product | R_Axial_DIN0207_L6.3mm_D2.5mm_P7.62mm_Horizontal | R3, R4, R5, R6, R7 |
| 7 | CFR16J1K0 1k TE Connectivity Passive Product | R_Axial_DIN0207_L6.3mm_D2.5mm_P7.62mm_Horizontal | R8, R16, R18, R30, R32, R34, R36 |
| 1 | CF14JT200K 200k Stackpole Electronics Inc | R_Axial_DIN0207_L6.3mm_D2.5mm_P7.62mm_Horizontal | R9 |
| 6 | CFR16J470R 470R TE Connectivity Passive Product | R_Axial_DIN0207_L6.3mm_D2.5mm_P7.62mm_Horizontal | R10, R11, R12, R13, R14, R21 |
| 1 | CF14JT10M0 10M Stackpole Electronics Inc | R_Axial_DIN0207_L6.3mm_D2.5mm_P7.62mm_Horizontal | R15 |
| 6 | CFR16J10K 10K TE Connectivity Passive Product | R_Axial_DIN0207_L6.3mm_D2.5mm_P7.62mm_Horizontal | R17, R20, R29, R31, R33, R35 |
| 1 | 8R_OPT | R_Axial_DIN0414_L11.9mm_D4.5mm_P15.24mm_Horizontal | R19 |
| 6 | CFR16J1K0 1K TE Connectivity Passive Product | R_Axial_DIN0207_L6.3mm_D2.5mm_P10.16mm_Horizontal | R22, R23, R24, R25, R26, R27 |
| 1 | CF14JT10R0 10R Stackpole Electronics Inc | R_Axial_DIN0207_L6.3mm_D2.5mm_P7.62mm_Horizontal | R28 |
| 7 | CFR16J100R 100R TE Connectivity Passive Product | R_Axial_DIN0207_L6.3mm_D2.5mm_P7.62mm_Horizontal | R37, R38, R39, R40, R41, R42, R43 |
| 1 | 470R | R_Axial_DIN0207_L6.3mm_D2.5mm_P7.62mm_Horizontal | R44 |
MCU BOARD design files
The KiCad project lives in the sparkletron/mil_time_clock repository on GitHub; these links point at the commit this page was built from.
MCU BOARD: common questions
How big is the MCU BOARD?
The MCU BOARD measures 79.3 × 101.1 mm, has 2 copper layers and is 1.6 mm thick.
How many components are on the MCU BOARD?
83 components, from 33 distinct parts, with part numbers taken from the project's own BOM. The full bill of materials is listed on this page.
Where can I download the MCU BOARD design files?
From the sparkletron/mil_time_clock repository on GitHub, which has the KiCad layout, the schematic and the BOM; the links under Design files point to each one.
Can I use the MCU BOARD design in my own project?
Yes, under the terms of its MIT license, which sparkletron chose for the repository.
