4 layers133.4 × 32.3 mm
4 layers165.5 × 51.6 mm
Firmware and PCBs for aCassiopeiae, a minature Altair 8800 clone
- Size
- 165.5 × 51.6 mm
- Copper layers
- 4
- Thickness
- 1.6 mm
- Parts
- 222
- Nets
- 259
- Pads
- 952
- Tracks, vias
- 2,289, 343
- Pours
- 50
- Routed
- Yes
- KiCad
- KiCad 8.0 (file 20240108)
- Created
- 27 Jan 2025
- Updated
- 30 Apr 2025
Overview
Panel is an open-source printed circuit board by AlphaCassiopeiae, from the AlphaCassiopeiae/8800 repository on GitHub. It is a 4-layer board of 165.5 × 51.6 mm with 222 parts on 259 nets, routed with 2,289 tracks and 343 vias.
It is built around the RP2350B, W25Q128JVSIQ and AMS1117-3.3, with the SS34, TS-1187A-B-A-B and ABM8-272-T3 among its other parts. Its parts include 103 resistors, 40 diodes, 31 switches, 29 capacitors and 10 ICs. It belongs with the RP2350 boards of this library.
Main components
8
RP2350B
QFN-80-EP(10x10)48 Power-on reset (POR)、Watchdog reset、External pin reset (NRST)、Built-in general-purpose timer、Integrated LDO、True random number generator (TRNG)、Hardware ECC check、Independent watchdog (IWDG) QFN-80-EP(10x10) Microcontrollers (MCU/MPU/SOC) ROHSRaspberry PiMicrocontrollers (MCU/MPU/SOC)
W25Q128JVSIQ
SOIC-8-208mil-40℃~+85℃ 100,000 cycles 120ms@(32KB) 128Mbit 133MHz 1uA 2.7V~3.6V 20 Years 3ms Power-on reset、Hardware write protection、Software write protection、Write enable latch、Absolute write protection SPI SOIC-8-208mil NOR FLASH ROHSWinbondNOR FLASH
AMS1117-3.3
SOT-223-40℃~+125℃ 0.003%Vout 1 1.1V@(800mA) 15V 1A 3.3V 5mA 72dB@(120Hz) Fixed Over Current Protection、Short Circuit Protection、Thermal shutdown Positive SOT-223 Voltage Regulators - Linear, Low Drop Out (LDO) Regulators ROHSAdvanced Monolithic SystemsVoltage Regulators - Linear, Low Drop Out (LDO) Regulators
SS34
SMA(DO-214AC)-55℃~+125℃ 3A 40V 500uA@40V 550mV@3A Independent SMA(DO-214AC) Schottky Diodes ROHSMDDSchottky Diodes
TS-1187A-B-A-B
SMD-4P,5.1x5.1mm-30℃~+85℃ 1.5mm 1.6N 100,000 cycles 12V 5.1mm 5.1mm 50mA Gold No Round Button SPST Surface Mount,Vertical Without Bracket SMD-4P,5.1x5.1mm Tactile Switches ROHSXKB ConnectionTactile Switches
ABM8-272-T3
SMD3225-4P-40℃~+85℃ 10pF 12MHz 50Ω SMD crystal oscillator ±30ppm ±30ppm SMD3225-4P Crystals ROHSAbraconCrystals
KT-0603R
0603-40℃~+85℃ 1.6mm x 0.8mm square LED 1.8V~2.4V 120° 20mA 300mcd 40mW 615nm~630nm 645nm Discrete Diode Red Water Clear 0603 LED Indication - Discrete ROHSHubei KENTO ElecLED Indication - DiscreteUSB4235-03-C
-- Lack of specifications ROHSGlobal Connector Technology (GCT)Uncategorised
Parts
222| Qty | Value | Footprint | References |
|---|---|---|---|
| 44 | 330 | Resistor_SMD:R_0402_1005Metric_Pad0.72x0.64mm_HandSolder | R45, R46, R47, R48, R49, R50, R51, R52, R53, R54, R55, R56, R57, R58, R59, R60 +28 |
| 36 | 49.9 | Resistor_SMD:R_0402_1005Metric_Pad0.72x0.64mm_HandSolder | R1, R2, R10, R11, R12, R13, R14, R15, R16, R17, R18, R19, R20, R21, R22, R23 +20 |
| 36 | D | Library:AA3528SECKTJ309 | D1, D2, D10, D11, D12, D13, D14, D15, D16, D17, D18, D19, D20, D21, D22, D23 +20 |
| 20 | 100n | Capacitor_SMD:C_0402_1005Metric | C1, C2, C10, C12, C13, C14, C15, C16, C17, C18, C19, C20, C21, C22, C24, C25 +4 |
| 16 | SW_SPDT | Library:SW_OS102011MS2QN1 | SW1, SW2, SW3, SW4, SW5, SW6, SW7, SW8, SW9, SW10, SW11, SW12, SW13, SW14, SW15, SW16 |
| 13 | 10k | Capacitor_SMD:C_0402_1005Metric | R91, R92, R93, R94, R95, R96, R97, R98, R99, R100, R101, R102, R103 |
| 13 | SW_Push | Library:SW_1825910-6-4 | SW17, SW18, SW19, SW20, SW21, SW22, SW23, SW24, SW25, SW26, SW27, SW28, SW29 |
| 5 | TLC59211IPWR | Package_SO:Texas_PWP0020A | U1, U2, U3, U4, U5 |
| 4 | 4.7u | Capacitor_SMD:C_0402_1005Metric | C7, C8, C9, C11 |
| 4 | MountingHole | MountingHole:MountingHole_3.5mm | H1, H2, H3, H4 |
| 3 | 1k | Resistor_SMD:R_0402_1005Metric_Pad0.72x0.64mm_HandSolder | R26, R27, R90 |
| 3 | SS34 | Diode_SMD:D_SMA | D38, D39, D41 |
| 2 | 15p | Capacitor_SMD:C_0402_1005Metric | C4, C5 |
| 2 | 22u | Capacitor_SMD:C_1206_3216Metric | C28, C29 |
| 2 | 27 | Resistor_SMD:R_0603_1608Metric_Pad0.98x0.95mm_HandSolder | R31, R32 |
| 2 | 5.1k | Resistor_SMD:R_0402_1005Metric_Pad0.72x0.64mm_HandSolder | R29, R30 |
| 2 | MCP23017_ML | Package_DFN_QFN:QFN-28-1EP_6x6mm_P0.65mm_EP4.25x4.25mm | U8, U9 |
| 2 | TS-1187A-B-A-B | Button_Switch_SMD:SW_Push_1P1T_XKB_TS-1187A | SW30, SW31 |
| 1 | 100k | Resistor_SMD:R_0402_1005Metric_Pad0.72x0.64mm_HandSolder | R25 |
| 1 | 10u | Capacitor_SMD:C_0402_1005Metric | C23 |
| 1 | 200 | Resistor_SMD:R_0402_1005Metric_Pad0.72x0.64mm_HandSolder | R89 |
| 1 | 3.3u | Library:IND-SMD_L2.0-W1.6_AOTA-B201610S3R3-101-T | L1 |
| 1 | 33 | Resistor_SMD:R_0402_1005Metric_Pad0.72x0.64mm_HandSolder | R28 |
| 1 | 5017868090 | Library:CON_5017868090 | J4 |
| 1 | ABM8-272-T3 | Library:ABM8-272-T3_ABR | X1 |
| 1 | AMS1117-3.3 | Package_TO_SOT_SMD:SOT-223-3_TabPin2 | U10 |
| 1 | Conn_01x03_Pin | Connector_JST:JST_XH_B3B-XH-A_1x03_P2.50mm_Vertical | J2 |
| 1 | KT-0603R | LED_SMD:LED_0603_1608Metric_Pad1.05x0.95mm_HandSolder | D37 |
| 1 | RP2350B | Library:RP2350-QFN-80-1EP_10x10_P0.4mm_EP3.4x3.4mm_ThermalVias | U6 |
| 1 | USB4235-03-C | Library:GCT_USB4235-03-C_REVA | J3 |
| 1 | W25Q128JVS | Package_SO:SOIC-8_5.23x5.23mm_P1.27mm | U7 |
Questions
How big is the Panel PCB?
It measures 165.5 × 51.6 mm and has 4 copper layers, 1.6 mm thick.
What parts does the Panel use?
222 parts, built around the RP2350B, W25Q128JVSIQ, AMS1117-3.3 and SS34. 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 Panel KiCad files?
From the AlphaCassiopeiae/8800 repository on GitHub, at the commit this page was made from: the board is ecad/panel/panel.kicad_pcb and its schematic ecad/backplane/backplane.kicad_sch. PCBKit opens the board in the browser, with nothing to install.
Can I use the Panel design in my own project?
Its repository states no licence, so its author keeps all rights: ask AlphaCassiopeiae before reusing the design.
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