4 layers135.2 × 46.8 mm
Gd power supply board pcb
baldengineer/Mega-IIe
Using the Mega II from a IIgs to make a Apple IIe compatible computer: The Mega IIe!
161 parts33MIT
4 layers163 × 174.4 mm
Gd rev3b
baldengineer/Mega-IIe33Using the Mega II from a IIgs to make a Apple IIe compatible computer: The Mega IIe!
- Size
- 163 × 174.4 mm
- Copper layers
- 4
- Thickness
- 4.69 mm
- Parts
- 440
- Nets
- 422
- Pads
- 1,552
- Tracks, vias
- 4,102, 546
- Pours
- 50
- Routed
- Yes
- KiCad
- KiCad 7 (file 20221018)
- Created
- 15 May 2021
- Updated
- 8 Aug 2024
Overview
Gd rev3b is an open-source printed circuit board by baldengineer, from the baldengineer/Mega-IIe repository on GitHub, published under the MIT licence. It is a 4-layer board of 163 × 174.4 mm with 440 parts on 422 nets, routed with 4,102 tracks and 546 vias.
It is built around the RP2040, 74HC245D and W25Q128JVSIQ, with the 74LVC2G04DW, MIC5504-3.3YM5 and NE556 among its other parts. Its parts include 94 resistors, 91 capacitors, 23 ICs, 10 transistors and 5 diodes. It belongs with the RP2040 boards of this library.
Main components
12
RP2040
LQFN-56(7x7)12bit 133MHz 30 LQFN-56(7x7) Microcontrollers (MCU/MPU/SOC) ROHSRaspberry PiMicrocontrollers (MCU/MPU/SOC)
74HC245D
SO-20-300mil-40℃~+125℃ 1 160uA 2V~6V 7.8mA 7.8mA 74HC 8 9ns@4.5V,50pF Bidirectional Tri-State SOIC-20-300mil Buffers, Drivers, Receivers, Transceivers ROHSNexperiaBuffers, Drivers, Receivers, Transceivers
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
74LVC2G04DW
SOT-363-40℃~+125℃ 1.65V~5.5V 1.7V~2V 10uA 2 2 3.8ns@5V,50pF 32mA 32mA 700mV~800mV 74LVC SOT-363 Inverters ROHSDiodes IncorporatedGates And Inverters
MIC5504-3.3YM5
SOT-23-5-40℃~+125℃@(Tj) 1 120uVrms 15uA 180mV@(300mA) 3.3V 300mA 5.5V 75dB@(1kHz) Fixed Over Temperature Protection、Enable Positive SOT-23-5 Voltage Regulators - Linear, Low Drop Out (LDO) Regulators ROHSTECH PUBLICVoltage Regulators - Linear, Low Drop Out (LDO) Regulators
NE556
SOP-140℃~+70℃ 2 200mA 4.5V~16V 5mA SOP-14 555 Timers / Counters ROHSGRTimers / Counters
SN74LVC573ANS
SO-20-40℃~+85℃ 1.5ns 1.65V~3.6V 24mA 2ns 6.9ns 74LVC 8 D Latch Tri-State SO-20 Latches ROHSTexas InstrumentsLatches
BC817
SOT-231 NPN 100nA 150MHz 300mW 40 45V 500mA 5V 700mV NPN SOT-23 Bipolar (BJT) ROHSShikuesBipolar (BJT)
20TQC100MD2
SMD,7.3x4.3mm-55℃~+105℃ 100mΩ@100kHz 100uF 20V ±20% SMD,7.3x4.3mm Tantalum Capacitors ROHSPanasonicTantalum Capacitors
47UF/25V
C1812C1812 SMT ROHSJLCPCB AssemblyUncategorised
T520A107M006ATE035
CASE-A-3216-18(mm)-55℃~+105℃ 100uF 35mΩ@100kHz 6.3V ±20% CASE-A-3216-18(mm) Tantalum Capacitors ROHSKEMETTantalum Capacitors
1SS389
SOD-523Schottky Diodeshongjiacheng
README
kicad files/gd power supply board pcb/README.md
Four-rail SMPS for the Mega IIe.
- Always-on 5V supply for the RP2040s and USB
- Switchable 5V for MEGA and other 5V Logic
- Switchable +12/-12V for disk drive and slot
Each 5V supply is designed for >1 Amp. The 12V supply was intended to provide at least 1 Amp. In rev1 testing it could provide 1 amp, but only for about 2 minutes. It's steady state max was around 750 mA.
The -12V supply can only provide a few hundred milliamps. However, in my testing other the analog video circuit used it. At most, it would draw 50 mA but usually sat around 10 mA.
The rev1 design suffered from severe conducted ripple from the 5V switchers. So the rev2 re-design is a 4-layer board with significant ground shielding of input and output rails.
Parts
440| Qty | Value | Footprint | References |
|---|---|---|---|
| 30 | 4k7 | Resistor_SMD:R_0805_2012Metric | R4, R5, R6, R20, R24, R25, R26, R27, R28, R29, R30, R51, R52, R53, R57, R58 +14 |
| 29 | TestPoint | TestPoint:TestPoint_Pad_D1.0mm | TP1, TP10, TP11, TP12, TP13, TP14, TP15, TP16, TP17, TP19, TP20, TP21, TP25, TP26, TP27, TP28 +13 |
| 16 | 1u | Capacitor_SMD:C_0603_1608Metric | C22, C27, C36, C40, C41, C42, C43, C46, C50, C64, C65, C76, C77, C78, C79, C82 |
| 14 | 1k | Resistor_SMD:R_0805_2012Metric | R19, R36, R74, R75, R78, R80, R81, R82, R85, R86, R89, R90, R91, RNP3 |
| 13 | 100n | Capacitor_SMD:C_0603_1608Metric | C20, C21, C25, C28, C29, C31, C32, C33, C45, C48, C66, C67, C68 |
| 13 | 1uF | Capacitor_SMD:C_0805_2012Metric | C1, C2, C3, C7, C8, C9, C10, C11, C16, C54, C55, C63, C75 |
| 12 | G*** | kibuzzard-629FC9D8 | kibuzzard-629FC9D8, kibuzzard-629FC9D8, kibuzzard-629FC9D8, kibuzzard-629FC9D8, kibuzzard-629FC9D8, kibuzzard-629FC9D8, kibuzzard-629FC9D8, kibuzzard-629FC9D8, kibuzzard-629FC9D8, kibuzzard-629FC9D8, kibuzzard-629FC9D8, kibuzzard-629FC9D8 |
| 11 | 10u | Capacitor_SMD:C_0805_2012Metric | C12, C13, C14, C15, C17, C18, C19, C26, C56, C57, C83 |
| 10 | 1u | Capacitor_SMD:C_0805_2012Metric | C6, C30, C34, C37, C44, C51, C80, C81, C84, C92 |
| 8 | 22 | Resistor_SMD:R_0805_2012Metric | R11, R12, R13, R14, R15, R16, R17, R18 |
| 8 | BC817 | Package_TO_SOT_SMD:SOT-23 | Q1, Q2, Q3, Q4, Q5, Q6, Q7, Q10 |
| 7 | 100 | Resistor_SMD:R_0805_2012Metric | R37, R54, R55, R62, R63, R70, R71 |
| 7 | MountingHole | MountingHole:MountingHole_2.5mm | H1, H2, H3, H4, H5, H6, H7 |
| 6 | G*** | kibuzzard-629FF22E | kibuzzard-629FF22E, kibuzzard-629FF22E, kibuzzard-629FF22E, kibuzzard-629FF22E, kibuzzard-629FF22E, kibuzzard-629FF22E |
| 6 | G*** | kibuzzard-629FF214 | kibuzzard-629FF214, kibuzzard-629FF214, kibuzzard-629FF214, kibuzzard-629FF214, kibuzzard-629FF214, kibuzzard-629FF214 |
| 6 | TestPoint | My Libraries:Harwin-S1751-46-Test-Point | TP18, TP34, TP35, TP36, TP37, TP38 |
| 4 | .1u | Capacitor_SMD:C_0805_2012Metric | C47, C52, C71, C72 |
| 4 | 100uF/20V | Capacitor_Tantalum_SMD:CP_EIA-3528-21_Kemet-B | C49, C69, C85, C86 |
| 4 | 1K | Resistor_SMD:R_0805_2012Metric | R59, R60, R68, R69 |
| 4 | 22n | Capacitor_SMD:C_0805_2012Metric | C53, C70, C73, C74 |
| 4 | 27 | Resistor_SMD:R_0603_1608Metric | R22, R23, R34, R35 |
| 4 | 27p | Capacitor_SMD:C_0603_1608Metric | C23, C24, C38, C39 |
| 4 | 47uF/25V | Capacitor_SMD:C_0805_2012Metric_Pad1.18x1.45mm_HandSolder | C87, C88, C89, C90 |
| 4 | 4k7 | Resistor_SMD:R_0603_1608Metric | R1, R79, RDNP1, RDNP2 |
| 4 | 74LVC2G04 | Package_TO_SOT_SMD:SOT-23-6 | U24, U29, U30, U35 |
| 4 | DRAM64KX4 | Package_DIP:DIP-18_W7.62mm_Socket_LongPads | U7, U8, U9, U10 |
| 4 | G*** | kibuzzard-629FA1B4 | kibuzzard-629FA1B4, kibuzzard-629FA1B4, kibuzzard-629FA1B4, kibuzzard-629FA1B4 |
| 4 | TestPoint_Harwin | TestPoint:TestPoint_Pad_D1.0mm | TP2, TP22, TP23, TP24 |
| 3 | 100 | Resistor_SMD:R_Array_Convex_4x0612 | RN1, RN2, RN3 |
| 3 | 100u | Capacitor_Tantalum_SMD:CP_EIA-3216-18_Kemet-A | C5, C35, C62 |
| 3 | 1k | Resistor_SMD:R_0402_1005Metric | R38, R41, R44 |
| 3 | 1u | Resistor_SMD:R_0805_2012Metric | C58, C60, C61 |
| 3 | 74HC245 | Package_SO:SOIC-20W_7.5x12.8mm_P1.27mm | U4, U5, U13 |
| 3 | EN | My Libraries:PinHeader_1x03_P2.54mm_Vertical-LOCK | J4, J7, J8 |
| 3 | G*** | kibuzzard-629FBBB6 | kibuzzard-629FBBB6, kibuzzard-629FBBB6, kibuzzard-629FBBB6 |
| 3 | G*** | kibuzzard-62A00D66 | kibuzzard-62A00D66, kibuzzard-62A00D66, kibuzzard-62A00D66 |
| 3 | G*** | kibuzzard-629FBBA8 | kibuzzard-629FBBA8, kibuzzard-629FBBA8, kibuzzard-629FBBA8 |
| 2 | 0 | Resistor_SMD:R_0603_1608Metric | R21, R33 |
| 2 | 100k | Resistor_SMD:R_0603_1608Metric | R87, R88 |
| 2 | 10k | Resistor_SMD:R_0805_2012Metric | R10, R49 |
| 2 | 1K | Resistor_SMD:R_0603_1608Metric | R31, R73 |
| 2 | 1SS389 | Diode_SMD:D_SOD-523 | D9, D26 |
| 2 | 2k2 | Resistor_SMD:R_0402_1005Metric | R40, R43 |
| 2 | 3k3 | Resistor_SMD:R_0603_1608Metric | R2, R3 |
| 2 | 470 | Resistor_SMD:R_0402_1005Metric | R42, R45 |
| 2 | 470 | Resistor_SMD:R_0603_1608Metric | R46, R56 |
| 2 | 74LVC2G04-2040 | Package_TO_SOT_SMD:SOT-23-6 | U31, U33 |
| 2 | ECS-120-18-33-JEM-TR | Crystal:Crystal_SMD_3225-4Pin_3.2x2.5mm | Y1, Y2 |
| 2 | G*** | kibuzzard-629FBD81 | kibuzzard-629FBD81, kibuzzard-629FBD81 |
| 2 | G*** | kibuzzard-629FBDE1 | kibuzzard-629FBDE1, kibuzzard-629FBDE1 |
| 2 | G*** | kibuzzard-629FA226 | kibuzzard-629FA226, kibuzzard-629FA226 |
| 2 | G*** | kibuzzard-629FA26A | kibuzzard-629FA26A, kibuzzard-629FA26A |
| 2 | G*** | kibuzzard-62A00D7F | kibuzzard-62A00D7F, kibuzzard-62A00D7F |
| 2 | G*** | kibuzzard-629FA1FF | kibuzzard-629FA1FF, kibuzzard-629FA1FF |
| 2 | G*** | kibuzzard-629FBDD5 | kibuzzard-629FBDD5, kibuzzard-629FBDD5 |
| 2 | G*** | kibuzzard-629FA211 | kibuzzard-629FA211, kibuzzard-629FA211 |
| 2 | G*** | kibuzzard-62A01879 | kibuzzard-62A01879, kibuzzard-62A01879 |
| 2 | G*** | kibuzzard-62A00D90 | kibuzzard-62A00D90, kibuzzard-62A00D90 |
| 2 | G*** | kibuzzard-629FBEF0 | kibuzzard-629FBEF0, kibuzzard-629FBEF0 |
| 2 | G*** | kibuzzard-629FBCCC | kibuzzard-629FBCCC, kibuzzard-629FBCCC |
| 2 | G*** | kibuzzard-62A00D22 | kibuzzard-62A00D22, kibuzzard-62A00D22 |
| 2 | G*** | kibuzzard-629FA258 | kibuzzard-629FA258, kibuzzard-629FA258 |
| 2 | G*** | kibuzzard-62A01867 | kibuzzard-62A01867, kibuzzard-62A01867 |
| 2 | G*** | kibuzzard-629FA2A5 | kibuzzard-629FA2A5, kibuzzard-629FA2A5 |
| 2 | MIC5504-3.3YM5 | Package_TO_SOT_SMD:SOT-23-5 | U15, U34 |
| 2 | MMBT3906 | Package_TO_SOT_SMD:SOT-23 | Q8, Q9 |
| 2 | NE556 | Package_SO:SO-14_3.9x8.65mm_P1.27mm | U20, U21 |
| 2 | RP2040 | RP2040_minimal:RP2040-QFN-56 | U14, U23 |
| 2 | SN74LVC573ANS | Package_SO:SO-20_5.3x12.6mm_P1.27mm | U25, U28 |
| 2 | W25Q128JVS | Package_SO:SOIC-8_5.23x5.23mm_P1.27mm | U17, U19 |
| 1 | +12v | LED_SMD:LED_1206_3216Metric | D5 |
| 1 | -12v | LED_SMD:LED_1206_3216Metric | D4 |
| 1 | -5V | LED_SMD:LED_1206_3216Metric | D25 |
| 1 | 1 | Resistor_SMD:R_0805_2012Metric | R8 |
| 1 | 10k | Resistor_SMD:R_0603_1608Metric | R84 |
| 1 | 10uF | Capacitor_SMD:C_0805_2012Metric | C4 |
| 1 | 14.31818MHz | Oscillator:Oscillator_SMD_EuroQuartz_XO91-4Pin_7.0x5.0mm | X1 |
| 1 | 150 | Resistor_SMD:R_0805_2012Metric | R50 |
| 1 | 1e-6 | Capacitor_SMD:C_0603_1608Metric_Pad1.08x0.95mm_HandSolder | C91 |
| 1 | 2 | Resistor_SMD:R_0805_2012Metric | R9 |
The 347 most common of 440 parts.
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Questions
How big is the Gd rev3b PCB?
It measures 163 × 174.4 mm and has 4 copper layers, 4.69 mm thick.
What parts does the Gd rev3b use?
440 parts, built around the RP2040, 74HC245D, W25Q128JVSIQ and 74LVC2G04DW. 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 Gd rev3b KiCad files?
From the baldengineer/Mega-IIe repository on GitHub, at the commit this page was made from: the board is kicad files/gd rev3b/gd rev3b.kicad_pcb. PCBKit opens the board in the browser, with nothing to install.
Can I use the Gd rev3b design in my own project?
Its repository publishes it under the MIT licence: you may reuse it on that licence's terms (keep the author's notice, and for a copyleft licence share your changes alike).