Mil Time Clock
About the Mil Time Clock PCB
Mil Time Clock 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 104 components from 41 distinct parts.
Other key parts include the 157142V12703, LM386, CD74HC4051E, AT89S51-33PU and SN74HC4060N. By type, the board carries 44 resistors, 26 capacitors, 9 diodes, 8 ICs, 5 transistors and 5 switches.
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 Mil Time Clock
Mil Time Clock bill of materials (BOM)
104 components, 41 distinct parts — part numbers from the project's BOM.
| Qty | Part | Footprint | Refs |
|---|---|---|---|
| 4 | 157142V12703 SM420561N Würth Elektronik | 7SegmentLED_LTS6760_LTS6780 | U1, U2, U3, U4 |
| 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 |
| 2 | 929500-01-36-RK Conn_01x27 3M | PinHeader_1x27_P2.54mm_Vertical | J1, J4 |
| 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 | B3F-1020 SET TIME E-Switch | B3F1000 | S1 |
| 1 | B3F-1020 HOUR E-Switch | B3F1000 | S2 |
| 1 | B3F-1020 MINUTE E-Switch | B3F1000 | S3 |
| 1 | B3F-1020 ALARM ON E-Switch | B3F1000 | S4 |
| 1 | B3F-1020 SET_ALARM E-Switch | B3F1000 | S5 |
| 1 | 861400011YO2LF TestPoint Amphenol ICC | PinHeader_1x01_P2.54mm_Vertical | TP1 |
| 9 | 151031VS06000 LED Würth Elektronik | LED_D3.0mm | D1, D2, D3, D4, D5, D6, D7, D8 +1 |
| 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 |
Show 21 more
| Qty | Part | Footprint | Refs |
|---|---|---|---|
| 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 |
| 1 | ESK106M016AC3KA 10uF Kemet | CP_Radial_D5.0mm_P2.00mm | C24 |
| 1 | FG28C0G2A180JNT00 8pF TDK | C_Disc_D4.3mm_W1.9mm_P5.00mm | C26 |
| 2 | CFR16J1K0 1K TE Connectivity Passive Product | R_Axial_DIN0207_L6.3mm_D2.5mm_P5.08mm_Vertical | R1, R2 |
| 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 |
Mil Time Clock 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.
Mil Time Clock: common questions
How big is the Mil Time Clock PCB?
The Mil Time Clock measures 79.3 × 101.1 mm, has 2 copper layers and is 1.6 mm thick.
How many components are on the Mil Time Clock?
104 components, from 41 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 Mil Time Clock 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 Mil Time Clock design in my own project?
Yes, under the terms of its MIT license, which sparkletron chose for the repository.
