4 layers36 × 150 mm
2 layers148.6 × 59.7 mm
Long count
akmorrison/long_countA PCB that just counts numbers down
- Size
- 148.6 × 59.7 mm
- Copper layers
- 2
- Thickness
- 1.6 mm
- Parts
- 125
- Nets
- 135
- Pads
- 363
- Tracks, vias
- 1,009, 71
- Pours
- 2
- Routed
- Yes
- KiCad
- KiCad 4
- Created
- 1 Jul 2018
- Updated
- 4 Jul 2018
Overview
Long count is an open-source printed circuit board by akmorrison, from the akmorrison/long_count repository on GitHub. It is a 2-layer board of 148.6 × 59.7 mm with 125 parts on 135 nets, routed with 1,009 tracks and 71 vias.
It is built around the PIC18F27K40-I/ML, CD74HC154M96 and LM7805CT, with the CC56-12EWA among its other parts. Its parts include 77 resistors, 16 transistors, 7 capacitors, 4 connectors and 4 switches. It belongs with the PIC boards of this library.
Main components
4
PIC18F27K40-I/ML
QFN-28-EP(6x6)-40℃~+85℃ 10bit 128KB 1KB 2.3V~5.5V 25 3.6KB 5bit 64MHz 8 Bit Built-in FLASH PIC QFN-28-EP(6x6) Microcontrollers (MCU/MPU/SOC) ROHSMicrochip TechnologyMicrocontrollers (MCU/MPU/SOC)
CD74HC154M96
SOIC-24-300mil-55℃~+125℃ 160uA 2V~6V 4/16 5.2mA 53ns@4.5V,50pF 74HC Decoder Single Supply SOIC-24-300mil Signal Switches, Multiplexers, Decoders ROHSTexas InstrumentsSignal Switches, Multiplexers, Decoders
LM7805CT
TO-2200℃~+70℃@(Ta) 1 1A 20V 2V@(1A) 40uV 5V 62dB@(120Hz) 8mA Fixed Over Current Protection、Short Circuit Protection、Thermal shutdown Positive TO-220 Voltage Regulators - Linear, Low Drop Out (LDO) Regulators ROHSTexas InstrumentsVoltage Regulators - Linear, Low Drop Out (LDO) Regulators
CC56-12EWA
Through hole- Lack of specifications ROHSKingbrightUncategorised
Parts
125| Qty | Value | Footprint | References |
|---|---|---|---|
| 34 | 330 | Resistors_SMD:R_1206_HandSoldering | R2, R29, R31, R33, R34, R35, R36, R37, R38, R39, R40, R41, R43, R45, R47, R49 +18 |
| 21 | 0 | Resistors_SMD:R_1206_HandSoldering | R1, R10, R11, R12, R13, R14, R15, R16, R17, R18, R19, R20, R21, R22, R23, R24 +5 |
| 16 | 1K | Resistors_SMD:R_1206_HandSoldering | R30, R32, R42, R44, R46, R48, R58, R60, R62, R64, R74, R76, R78, R80, R90, R92 |
| 16 | Q_PNP_BEC | TO_SOT_Packages_SMD:SOT-23_Handsoldering | Q1, Q2, Q3, Q4, Q5, Q6, Q7, Q8, Q9, Q10, Q11, Q12, Q13, Q14, Q15, Q16 |
| 7 | C | Capacitors_SMD:C_0805_HandSoldering | C1, C2, C3, C4, C5, C6, C7 |
| 5 | 10k | Resistors_SMD:R_1206_HandSoldering | R6, R25, R26, R27, R28 |
| 4 | CC56-12 | Displays_7-Segment:CA56-12SYKWA | AFF1, AFF2, AFF3, AFF4 |
| 3 | SW_Push | Buttons_Switches_SMD:SW_SPST_B3SL-1002P | SW2, SW3, SW4 |
| 1 | 12MHz | Crystals:Crystal_HC49-4H_Vertical | Y1 |
| 1 | 32.768KHz | Crystals:Resonator_SMD_muRata_CDSCB-2pin_4.5x2.0mm_HandSoldering | Y2 |
| 1 | BARREL_JACK | Connectors:BARREL_JACK | J2 |
| 1 | CD74HC154M96 | Housings_SOIC:SOIC-24W_7.5x15.4mm_Pitch1.27mm | U3 |
| 1 | Fuse | Fuse_Holders_and_Fuses:Fuseholder5x20_horiz_open_inline_Type-I | F1 |
| 1 | LM7805CT | TO_SOT_Packages_THT:TO-220-3_Vertical | U2 |
| 1 | PIC18F27K40 | Housings_DIP:DIP-28_W7.62mm_Socket | U1 |
| 1 | PICKIT connector | Pin_Headers:Pin_Header_Straight_1x06_Pitch2.54mm | J1 |
| 1 | PWR | LEDs:LED_1206_HandSoldering | D2 |
| 1 | R | Resistors_SMD:R_1206_HandSoldering | R3 |
| 1 | Rotary_Encoder | Local_buttons_THT:rotary_encoder | SW1 |
| 1 | STAT | LEDs:LED_1206_HandSoldering | D1 |
| 1 | VDD | Pin_Headers:Pin_Header_Straight_1x01_Pitch2.54mm | J3 |
| 1 | VSS | Pin_Headers:Pin_Header_Straight_1x01_Pitch2.54mm | J4 |
The 120 most common of 125 parts.
Questions
How big is the Long count PCB?
It measures 148.6 × 59.7 mm and has 2 copper layers, 1.6 mm thick.
What parts does the Long count use?
125 parts, built around the PIC18F27K40-I/ML, CD74HC154M96, LM7805CT and CC56-12EWA. 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 Long count KiCad files?
From the akmorrison/long_count repository on GitHub, at the commit this page was made from: the board is schematics/long_count.kicad_pcb. PCBKit opens the board in the browser, with nothing to install.
Can I use the Long count design in my own project?
Its repository states no licence, so its author keeps all rights: ask akmorrison before reusing the design.
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