Leako
About the Leako PCB
Leako is an open source PCB design by barbeque, published on GitHub. It is a 2-layer board measuring 149.1 × 98.8 mm, with 128 components from 67 distinct parts.
Other key parts include the PLCCZ80, ICL7660, BIOS ROM 27C256, 74HCT04 and TMS9918A. By type, the board carries 40 capacitors, 40 resistors, 22 ICs, 6 connectors, 5 test points and 4 transistors.
It belongs with the retro computing designs in this gallery.
From the project
A ColecoVision clone
A ColecoVision-compatible games console that you can build yourself!
- Part 1, covering the impetus and design; - Part 2, covering the assembly and debugging. - Part 3, covering "digital" joysticks and the Hand Controller - Part 4, partially covering "quadrature" joysticks such as the steering wheel and Roller Controller
If you enjoyed this project or if you're interested in contributing to future development, I would greatly appreciate a subscription to the Leaded Solder Patreon. The Patreon not only helps me afford to develop expensive projects like this one, but also includes…
Main components on the Leako
Leako bill of materials (BOM)
128 components, 67 distinct parts — part numbers from the project's BOM.
| Qty | Part | Footprint | Refs |
|---|---|---|---|
| 1 | PLCCZ80 | PLCC44 | U1 |
| 1 | ICL7660 | SOIC-8_3.9x4.9mm_P1.27mm | U2 |
| 1 | BIOS ROM 27C256 | DIP-28_W15.24mm_Socket_LongPads | U3 |
| 2 | 74HCT04 | SOIC-14_3.9x8.7mm_Pitch1.27mm | U4, U11 |
| 1 | TMS9918A | DIP-40_W15.24mm_Socket_LongPads | U5 |
| 3 | 74HCT574 | SOIC-20W_7.5x12.8mm_P1.27mm_LongLegs | U6, U7, U8 |
| 1 | SN76489AN | DIP-16_W7.62mm_Socket_LongPads | U10 |
| 1 | 74LS138 (Mem. Mapped) | SOIC-16_3.9x9.9mm_Pitch1.27mm | U12 |
| 1 | 74LS138 (I/O) | SOIC-16_3.9x9.9mm_Pitch1.27mm | U13 |
| 1 | 74LS02 | SOIC-14_3.9x8.7mm_Pitch1.27mm | U14 |
| 1 | 74LS541 (Ctrl. 2) | SOIC-20W_7.5x12.8mm_P1.27mm | U15 |
| 1 | 74LS541 (Ctrl. 1) | SOIC-20W_7.5x12.8mm_P1.27mm | U16 |
| 2 | 74LS05 | SOIC-14_3.9x8.7mm_Pitch1.27mm | U17, U18 |
| 2 | 74LS74 | SOIC-14_3.9x8.7mm_Pitch1.27mm | U20, U22 |
| 1 | 74HCT00 | SOIC-14_3.9x8.7mm_Pitch1.27mm | U23 |
| 2 | AS6C62256-DIP | DIP-28_W15.24mm_Socket_LongPads | U100, U101 |
| 1 | 2n4401 | TO-92_Inline_Wide | Q1 |
| 1 | Q_NJFET_GSD | SOT-23_Handsoldering | Q2 |
| 2 | 2N3904 | TO-92_Inline_Wide | Q4, Q5 |
| 1 | 14.31818MHz | Oscillator_DIP-8_LargePads | X1 |
Show 47 more
| Qty | Part | Footprint | Refs |
|---|---|---|---|
| 1 | 10.738635MHZ | Crystal_HC49-U_Vertical | Y1 |
| 1 | Cartridge Slot | Sullins_Cart_Slot | J1 |
| 1 | Composite video | CUI_RCJ-017 | J2 |
| 1 | USB-B1HSB6 | OST_USB-B1HSB6 | J3 |
| 1 | RCJ-013 | CUI_RCJ-017 | J4 |
| 1 | Controller Port 2 | A-DS 09 A-KG-T2S | J5 |
| 1 | Controller Port 1 | A-DS 09 A-KG-T2S | J6 |
| 1 | 2A | 0251002.MRT1L | F2 |
| 1 | SolderJumper_2_Open | SolderJumper-2_P1.3mm_Open_Pad1.0x1.5mm | JP1 |
| 1 | SolderJumper_2_Bridged | SolderJumper-2_P1.3mm_Bridged_Pad1.0x1.5mm | JP2 |
| 1 | Power Toggle | PVA1_Switch | SW1 |
| 1 | Reset | SW_PUSH_6mm | SW2 |
| 3 | TestPoint | Measurement_Point_Round-TH_Small | TP2, TP3, TP11 |
| 1 | -5V | TestPoint_Loop_D1.80mm_Drill1.0mm_Beaded | TP10 |
| 1 | TestPoint | Measurement_Point_Round-SMD-Pad_Small | TP14 |
| 1 | LED | LED_D3.0mm | D1 |
| 2 | 1N4001 | D_DO-41_SOD81_P2.54mm_Vertical_AnodeUp | D3, D4 |
| 1 | Bead | Choke_SMD_1206_Handsoldering | FB1 |
| 23 | 0.1µF | C_0805_HandSoldering | C1, C2, C4, C5, C6, C7, C8, C9 +15 |
| 2 | 47nF | C_0805_HandSoldering | C3, C32 |
| 1 | 22µF | CP_Radial_D5.0mm_P2.50mm | C12 |
| 2 | 10µF | C_0805_2012Metric_Pad1.15x1.40mm_HandSolder | C14, C28 |
| 1 | 1µF | C_0805_HandSoldering | C21 |
| 2 | 56pF | C_0805_HandSoldering | C23, C26 |
| 1 | 220µF | CP_Radial_D6.3mm_P2.50mm | C25 |
| 2 | 100pF | C_0805_HandSoldering | C30, C31 |
| 4 | 10nF | C_0805_HandSoldering | C35, C36, C37, C38 |
| 2 | 0.1µF | C_0805_2012Metric_Pad1.15x1.40mm_HandSolder | C39, C40 |
| 1 | 2.7kΩ | R_0805_HandSoldering | R1 |
| 7 | 3.3kΩ | R_0805_HandSoldering | R2, R3, R9, R10, R14, R19, R44 |
| 1 | 0Ω | R_0805_HandSoldering | R4 |
| 1 | 470Ω | R_0805_HandSoldering | R5 |
| 1 | 75Ω | R_0805_HandSoldering | R6 |
| 1 | 150Ω | R_0805_HandSoldering | R7 |
| 7 | 1.5kΩ | R_0805_HandSoldering | R11, R18, R21, R28, R35, R40, R41 |
| 1 | 330Ω | R_0805_HandSoldering | R12 |
| 3 | 10kΩ | R_0805_HandSoldering | R13, R23, R24 |
| 1 | 4.7kΩ | R_0805_HandSoldering | R15 |
| 1 | 91kΩ | R_0805_HandSoldering | R16 |
| 1 | 1MΩ | R_0805_HandSoldering | R17 |
| 3 | 22kΩ | R_0805_HandSoldering | R20, R31, R32 |
| 1 | 47Ω | R_0805_HandSoldering | R27 |
| 2 | 1.8kΩ | R_0805_HandSoldering | R33, R34 |
| 2 | 100kΩ | R_0805_HandSoldering | R36, R37 |
| 2 | 270Ω | R_0805_HandSoldering | R38, R39 |
| 2 | 120Ω | R_0805_HandSoldering | R42, R43 |
| 2 | 22kΩ | R_Array_SIP8 | RN1, RN2 |
Leako design files
The KiCad project lives in the barbeque/leako repository on GitHub; these links point at the commit this page was built from.
- LayoutColecoVision Clone.kicad_pcb
- SchematicColecoVision Clone.kicad_sch
- BOMBom-v0.1.csv
Leako: common questions
How big is the Leako PCB?
The Leako measures 149.1 × 98.8 mm, has 2 copper layers and is 1.6 mm thick.
How many components are on the Leako?
128 components, from 67 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 Leako design files?
From the barbeque/leako 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 Leako design in my own project?
The repository has no license, so all rights stay with barbeque. Use it as a reference, and ask the author before reusing the design.
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