2 layers486 × 306.3 mm
2 layers630 × 300 mm
SecretBase
stonedDiscord/SecretBaseSEGA Secret Base Arcade Game
- Size
- 630 × 300 mm
- Copper layers
- 2
- Thickness
- 1.6 mm
- Parts
- 441
- Nets
- 1,462
- Pads
- 4,242
- Tracks, vias
- 24,451, 1,917
- Pours
- 10
- Routed
- Yes
- KiCad
- KiCad 8.0 (file 20240108)
- Created
- 10 Apr 2024
- Updated
- 12 Nov 2025
Overview
SecretBase is an open-source printed circuit board by stonedDiscord, from the stonedDiscord/SecretBase repository on GitHub. It is a 2-layer board of 630 × 300 mm with 441 parts on 1,462 nets, routed with 24,451 tracks and 1,917 vias.
It is built around the 74LS42PC, 74LS161DC and 74LS151PC, with the 74LS00SC, 74LS02PC and 74LS153DC among its other parts. Its parts include 233 ICs, 81 resistors, 68 capacitors, 2 diodes and 2 transistors. It belongs with the retro computing and games boards of this library.
Main components
12
74LS42PC
PDIP-16-55℃~+125℃ PDIP-16 Interface - SpecializedTexas InstrumentsInterface - Specialized
74LS161DC
-0℃~+70℃ 14ns 32MHz 4 4.75V~5.25V 74LS 93mW Asynchronous Binary Counter Programmable divide ratio、Reset function、Cascade counter、Synchronous counting Rising Edge Synchronous - Counters, DividersTexas InstrumentsCounters, Dividers74LS151PC
DIP-160℃~+70℃ 12.5ns 4.75V~5.25V 400uA 6mA 74LS 8mA Tri-state output DIP-16 Signal Switches, Multiplexers, Decoders ROHSonsemiSignal Switches, Multiplexers, Decoders
74LS00SC
-0℃~+70℃ 15ns@5V,50pF 2 2.7V 2V 4 4.75V~5.25V 400uA 500mV 74LS 800mV 8mA NAND Gate - Logic Gates ROHSTexas InstrumentsLogic Gates
74LS02PC
DIP-140℃~+70℃ 15ns@5V,15pF 2 2.7V 2V 4 4.75V~5.25V 400uA 500mV 74LS 800mV 8mA 8mA NOR Gate DIP-14 Logic Gates ROHSonsemiLogic Gates74LS153DC
PDIP-160℃~+70℃ 14ns 4.75V~5.25V 400uA 400uA 6.2mA 74LS Single Supply Tri-state output PDIP-16 Signal Switches, Multiplexers, Decoders ROHSTexas InstrumentsSignal Switches, Multiplexers, Decoders74LS04PC
PDIP-140℃~+70℃ 4.75V~5.25V 6 6.6mA 74LS PDIP-14 InvertersonsemiInverters74LS74PC
DIP-140ns 0℃~+70℃ 1 2 20MHz 3.5pF 35ns@5V,50pF 4.5ns 4.75V~5.25V 400uA 74LS Series 8mA 8mA Asynchronous Complementary D-Type Rising Edge Set and Reset DIP-14 Flip FlopsTexas InstrumentsFlip Flops74LS30PC
PDIP-140℃~+70℃ 1 1.1mA 18ns@5V,50pF、20ns@5V,50pF 2.7V 2V 4.75V~5.25V 400uA 500mV 74LS Series 8 800mV 8mA NAND Gate PDIP-14 Logic GatesTexas InstrumentsLogic Gates74LS10PC
PDIP-140℃~+70℃ 3 3.3mA 4.75V~5.25V 74LS Series NAND Gate PDIP-14 Logic GatesonsemiLogic Gates74LS393P-E
DIP-14-20℃~+75℃ 2 35MHz 4 4.75V~5.25V 400mW 40ns@5V,15pF 74LS Binary Counter Reset function DIP-14 Counters, Dividers ROHSRenesas ElectronicsCounters, Dividers
NE555P
DIP-80℃~+70℃ 100kHz 10mA 4.5V~16V DIP-8 555 Timers / Counters ROHSTexas InstrumentsTimers / Counters
README
README.mdTraced SEGAs Secret Base Board
https://kicanvas.org/?github=https%3A%2F%2Fgithub.com%2FstonedDiscord%2FSecretBase
Parts
441| Qty | Value | Footprint | References |
|---|---|---|---|
| 34 | 74LS161 | Package_DIP:DIP-16_W7.62mm | U108, U112, U113, U123, U124, U125, U126, U128, U129, U154, U157, U158, U166, U183, U188, U189 +18 |
| 29 | 0,1uF 25V | Capacitor_THT:C_Axial_L3.8mm_D2.6mm_P10.00mm_Horizontal | Cf1, Cf2, Cf10, Cf11, Cf12, Cf13, Cf14, Cf15, Cf16, Cf17, Cf18, Cf19, Cf20, Cf21, Cf22, Cf23 +13 |
| 22 | 470 | Resistor_THT:R_Axial_DIN0309_L9.0mm_D3.2mm_P12.70mm_Horizontal | R1, R3, R5, R11, R13, R15, R17, R19, R21, R23, R26, R28, R30, R32, R34, R59 +6 |
| 21 | 680p | Capacitor_THT:C_Disc_D3.0mm_W1.6mm_P2.50mm | C19, C20, C23, C28, C36, C39, C40, C41, C45, C46, C56, C58, C59, C60, C61, C1143 +5 |
| 19 | 100 | Resistor_THT:R_Axial_DIN0309_L9.0mm_D3.2mm_P12.70mm_Horizontal | R2, R4, R6, R10, R12, R14, R16, R18, R20, R22, R24, R25, R27, R29, R31, R33 +3 |
| 18 | 74LS151 | Package_DIP:DIP-16_W7.62mm | U83, U102, U119, U130, U148, U151, U164, U165, U177, U178, U185, U192, U209, U216, U233, U237 +2 |
| 17 | 0,1uF 25V | Capacitor_THT:C_Disc_D4.3mm_W1.9mm_P5.00mm | C2, C3, C4, C5, C6, C7, C8, C10, C11, C12, C13, C14, C15, C16, C17, C18 +1 |
| 14 | 74LS00 | Package_DIP:DIP-14_W7.62mm | U25, U40, U49, U63, U69, U98, U105, U142, U167, U170, U184, U190, U208, U224 |
| 13 | 74LS02 | Package_DIP:DIP-14_W7.62mm | U5, U39, U41, U47, U76, U96, U134, U139, U140, U144, U220, U229, U243 |
| 11 | 74LS107 | Package_DIP:DIP-14_W7.62mm | U20, U109, U114, U133, U135, U152, U160, U182, U211, U239, U244 |
| 10 | 4.7k | Resistor_THT:R_Axial_DIN0309_L9.0mm_D3.2mm_P12.70mm_Horizontal | R50, R51, R52, R53, R54, R55, R56, R58, R80, R85 |
| 10 | 74LS153 | Package_DIP:DIP-16_W7.62mm | U52, U58, U62, U100, U103, U161, U180, U213, U231, U245 |
| 9 | 74LS04 | Package_DIP:DIP-14_W7.62mm | U35, U74, U78, U94, U99, U155, U200, U210, U226 |
| 9 | 74LS74 | Package_DIP:DIP-14_W7.62mm | U42, U68, U71, U95, U136, U228, U230, U236, U248 |
| 8 | 74LS30 | Package_DIP:DIP-14_W7.62mm | U28, U50, U53, U56, U70, U72, U127, U241 |
| 7 | 220 | Resistor_THT:R_Axial_DIN0309_L9.0mm_D3.2mm_P12.70mm_Horizontal | R35, R36, R38, R40, R49, R61, R62 |
| 7 | 47k | Resistor_THT:R_Axial_DIN0309_L9.0mm_D3.2mm_P12.70mm_Horizontal | R44, R45, R46, R47, R57, R76, R78 |
| 7 | 74LS08 | Package_DIP:DIP-14_W7.62mm | U29, U64, U89, U106, U201, U204, U227 |
| 7 | 74LS10 | Package_DIP:DIP-14_W7.62mm | U97, U110, U143, U153, U156, U218, U225 |
| 7 | Conn_02x08_Counter_Clockwise | SEGA:DIP-16_W7.62mm_Bodge | U1, U2, U3, U4, U115, U232, U235 |
| 6 | 74LS393 | Package_DIP:DIP-14_W7.62mm | U33, U36, U59, U121, U181, U249 |
| 6 | NE555P | Package_DIP:DIP-8_W7.62mm | U38, U107, U137, U138, U202, U203 |
| 6 | TestPoint | TestPoint:TestPoint_THTPad_D1.5mm_Drill0.7mm | TP1, TP2, TP3, TP4, TP5, TP6 |
| 5 | 0.01u | Capacitor_THT:C_Disc_D4.3mm_W1.9mm_P5.00mm | C21, C24, C26, C29, C37 |
| 5 | 74LS123 | Package_DIP:DIP-16_W7.62mm | U7, U8, U9, U173, U174 |
| 5 | 74LS193 | Package_DIP:DIP-16_W7.62mm | U32, U34, U91, U120, U250 |
| 5 | 74LS279 | Package_DIP:DIP-16_W7.62mm | U75, U93, U104, U169, U199 |
| 5 | 74LS32 | Package_DIP:DIP-14_W7.62mm | U6, U73, U87, U92, U222 |
| 5 | 74LS42 | Package_DIP:DIP-16_W7.62mm | U162, U191, U257, U258, U259 |
| 5 | 74LS86 | Package_DIP:DIP-14_W7.62mm | U101, U186, U215, U242, U246 |
| 4 | 10u 10V | Capacitor_THT:CP_Radial_Tantal_D4.5mm_P2.50mm | C51, C52, C53, C54 |
| 4 | 7450 | Package_DIP:DIP-14_W7.62mm | U65, U172, U197, U219 |
| 4 | 74LS145 | Package_DIP:DIP-16_W7.62mm | U37, U122, U150, U179 |
| 4 | 74LS175 | Package_DIP:DIP-16_W7.62mm | U116, U171, U221, U253 |
| 4 | MountingHole | MountingHole:MountingHole_4.3mm_M4 | H1, H2, H3, H4 |
| 3 | 1M | Resistor_THT:R_Axial_DIN0309_L9.0mm_D3.2mm_P12.70mm_Horizontal | R37, R39, R48 |
| 3 | 2.2M | Resistor_THT:R_Axial_DIN0309_L9.0mm_D3.2mm_P12.70mm_Horizontal | R41, R42, R43 |
| 3 | 33u 10V | Capacitor_THT:CP_Radial_Tantal_D4.5mm_P2.50mm | C31, C32, C34 |
| 3 | 7425 | Package_DIP:DIP-14_W7.62mm | U118, U147, U176 |
| 3 | 74LS157 | Package_DIP:DIP-16_W7.62mm | U111, U206, U234 |
| 3 | 74LS27 | Package_DIP:DIP-14_W7.62mm | U141, U145, U223 |
| 3 | 74LS85 | Package_DIP:DIP-16_W7.62mm | U195, U251, U252 |
| 3 | ~ | Package_DIP:DIP-16_W7.62mm | U254, U255, U256 |
| 2 | 0.1u | Capacitor_THT:C_Disc_D3.0mm_W1.6mm_P2.50mm | C42, C63 |
| 2 | 0.22u 35V | Capacitor_THT:C_Disc_D3.0mm_W1.6mm_P2.50mm | C27, C30 |
| 2 | 10k | Resistor_THT:R_Axial_DIN0309_L9.0mm_D3.2mm_P12.70mm_Horizontal | R64, R90 |
| 2 | 1k | Resistor_THT:R_Axial_DIN0309_L9.0mm_D3.2mm_P12.70mm_Horizontal | R68, R71 |
| 2 | 2.2k | Resistor_THT:R_Axial_DIN0309_L9.0mm_D3.2mm_P12.70mm_Horizontal | R66, R67 |
| 2 | 2SC1384 | Package_TO_SOT_THT:TO-92_Wide | Q1, Q2 |
| 2 | 3.3k | Resistor_THT:R_Axial_DIN0309_L9.0mm_D3.2mm_P12.70mm_Horizontal | R69, R70 |
| 2 | 680p | Capacitor_THT:C_Disc_D4.3mm_W1.9mm_P5.00mm | C35, C143 |
| 2 | 7416 | Package_DIP:DIP-14_W7.62mm | U10, U11 |
| 2 | 74LS148 | Package_DIP:DIP-16_W7.62mm | U48, U77 |
| 2 | 74LS192 | Package_DIP:DIP-16_W7.62mm | U88, U117 |
| 2 | 74LS390 | Package_DIP:DIP-16_W7.62mm | U146, U175 |
| 2 | 74S287 | Package_DIP:DIP-16_W7.62mm | U82, U159 |
| 2 | D | Diode_THT:D_DO-15_P12.70mm_Horizontal | D1, D2 |
| 2 | SN74LS279AN | Package_DIP:DIP-16_W7.62mm | U43, U46 |
| 1 | 0.01u | Capacitor_THT:C_Disc_D3.0mm_W1.6mm_P2.50mm | C47 |
| 1 | 0.1u | Capacitor_THT:C_Axial_L3.8mm_D2.6mm_P10.00mm_Horizontal | C49 |
| 1 | 0.33u | Capacitor_THT:C_Disc_D3.0mm_W1.6mm_P2.50mm | C22 |
| 1 | 0.33u 15V | Capacitor_THT:C_Disc_D3.0mm_W1.6mm_P2.50mm | C38 |
| 1 | 0.33u 35V | Capacitor_THT:C_Disc_D3.0mm_W1.6mm_P2.50mm | C25 |
| 1 | 100p | Capacitor_THT:C_Disc_D3.0mm_W1.6mm_P2.50mm | C50 |
| 1 | 10u 10V | Capacitor_THT:CP_Radial_D8.0mm_P3.50mm | C57 |
| 1 | 14,305 | Crystal:Crystal_HC18-U_Horizontal_1EP_style2 | Y1 |
| 1 | 20k | Potentiometer_THT:Potentiometer_Piher_PT-15-H25_Horizontal | RV1 |
| 1 | 220u 10V | Capacitor_THT:CP_Radial_D8.0mm_P3.80mm | C44 |
| 1 | 22k | Resistor_THT:R_Axial_DIN0309_L9.0mm_D3.2mm_P12.70mm_Horizontal | R63 |
| 1 | 22u 16V | Capacitor_THT:C_Disc_D3.0mm_W1.6mm_P2.50mm | C48 |
| 1 | 33 | Resistor_THT:R_Axial_Power_L38.0mm_W6.4mm_P40.64mm | R79 |
| 1 | 33u 10V | Capacitor_THT:C_Disc_D4.3mm_W1.9mm_P5.00mm | C33 |
| 1 | 470u 16V | Capacitor_THT:CP_Radial_D8.0mm_P3.50mm | C1 |
| 1 | 47u 10V | Capacitor_THT:CP_Radial_Tantal_D4.5mm_P2.50mm | C55 |
| 1 | 74LS11 | Package_DIP:DIP-14_W7.62mm | U196 |
| 1 | 74LS20 | Package_DIP:DIP-14_W7.62mm | U205 |
| 1 | 74LS259 | Package_DIP:DIP-16_W7.62mm | U132 |
| 1 | 74LS37 | Package_DIP:DIP-14_W7.62mm | U198 |
| 1 | 74LS75 | Package_DIP:DIP-16_W7.62mm | U168 |
| 1 | Conn_02x22_Top_Bottom | SEGA:CardEdge22 | J1 |
The 428 most common of 441 parts.
Questions
How big is the SecretBase PCB?
It measures 630 × 300 mm and has 2 copper layers, 1.6 mm thick.
What parts does the SecretBase use?
441 parts, built around the 74LS42PC, 74LS161DC, 74LS151PC and 74LS00SC. 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 SecretBase KiCad files?
From the stonedDiscord/SecretBase repository on GitHub, at the commit this page was made from: the board is Main.kicad_pcb and its schematic Main.kicad_sch. PCBKit opens the board in the browser, with nothing to install.
Can I use the SecretBase design in my own project?
Its repository states no licence, so its author keeps all rights: ask stonedDiscord before reusing the design.
Similar boards
- 2 layers364 × 203 mm
- 2 layers349.3 × 160 mm
- 2 layers299.2 × 180 mm
- 2 layers299.2 × 180 mm
Cobra XP
ceteras/Cobra-XP
Derived from Cobra, an experimental board for testing all kind of mods.
452 parts5MIT - 2 layers365.1 × 203.2 mm
DIAG
Nakazoto/CenturionComputer
This is just a simple backup of all the files related to the Centurion that I have stored on my HD. The Wiki itself has far more in-depth information about the Centurion and it's individual cards.
150 parts172 - 2 layers236 × 171 mm
- 2 layers124.5 × 132.1 mm
Interface osi
osiweb/unified_retro_keyboard
Project to provide keyboard replacements for various classic computers, as well as classic ASCII keyboard
80 parts122