2 layers213.4 × 130.8 mm
Issue 4
iansbremner/ZX-Spectrum-Issue-4B-KiCAD
Recreation of the ZX Spectrum Issue 4B board in KiCAD
199 parts22
2 layers213.1 × 130 mm
Kicad project of a ZX Spectrum 48K Issue 4B
- Size
- 213.1 × 130 mm
- Copper layers
- 2
- Thickness
- 1.6 mm
- Parts
- 207
- Nets
- 176
- Pads
- 925
- Tracks, vias
- 7,640, 466
- Routed
- Yes
- KiCad
- KiCad 10.0 (file 20260206)
- Created
- 1 Oct 2026
- Updated
- 29 Oct 2026
Overview
Issue4B is an open-source printed circuit board by liveboxandy, from the liveboxandy/ZX-Spectrum-48K-Issue-4B repository on GitHub, published under the CC0-1.0 licence. It is a 2-layer board of 213.1 × 130 mm with 207 parts on 176 nets, routed with 7,640 tracks and 466 vias.
It is built around the BC184. Its parts include 73 resistors, 60 capacitors, 26 ICs, 15 diodes and 2 inductors.
Main components
1README
README.mdThis is a Kicad 10 project and was only used to create an ibom to assist in the debugging of faulty boards. Use at your own risk.
The ZX Spectrum Issue 4B PCB used has an MFG date of 8444 and has a silkscreen FAB revision of SRC168, a topside FAB revision of SRC166 and a solder side FAB revision of SRC167.
The created schematic was based on the physical layout of the PCB and appears to show the DCDC circuit as per a revision 4A where capacitor C79 is before R79 and D19 is after R79 on the -5V line.
Note that R32 is fitted as a 0R link on this PCB.
According to the Issue 6 schematic, C100 is 10nF and C101 is 47nF.
I would not use these gerbers to manufacture a PCB without a lot more checking.
Have fun.
Parts
207| Qty | Value | Footprint | References |
|---|---|---|---|
| 23 | 22nF | Mod:C_Axial_L3.8mm_D2.6mm_P12.70mm_Horizontal | C1, C2, C3, C4, C5, C26, C30, C33, C40, C41, C42, C48, C55, C56, C57, C58 +7 |
| 12 | 10K | Mod:R_Yageo_L3.6mm_D1.6mm_P12.70mm_Horizontal | R28, R29, R30, R49, R65, R66, R67, R68, R69, R72, R74, R75 |
| 11 | 1N4148 | Mod:D_DO-35_SOD27_P12.70mm_Horizontal | D1, D2, D3, D4, D5, D6, D7, D8, D9, D11, D18 |
| 11 | 470R | Mod:R_Yageo_L3.6mm_D1.6mm_P12.70mm_Horizontal | R1, R2, R3, R4, R5, R6, R7, R8, R26, R27, R78 |
| 9 | 1K | Mod:R_Yageo_L3.6mm_D1.6mm_P12.70mm_Horizontal | R24, R42, R45, R46, R47, R58, R73, R76, R77 |
| 8 | 330R | Mod:R_Yageo_L3.6mm_D1.6mm_P12.70mm_Horizontal | R17, R18, R19, R20, R21, R22, R23, R57 |
| 8 | 4116 | Mod:DIP-16_W7.62mm_Socket | IC6, IC7, IC8, IC9, IC10, IC11, IC12, IC13 |
| 8 | 4532 | Mod:DIP-16_W7.62mm_Socket | IC15, IC16, IC17, IC18, IC19, IC20, IC21, IC22 |
| 8 | 8k2 | Mod:R_Yageo_L3.6mm_D1.6mm_P12.70mm_Horizontal | R9, R10, R11, R12, R13, R14, R15, R16 |
| 6 | 100nF | Mod:C_Axial_L3.8mm_D2.6mm_P12.70mm_Horizontal | C43, C68, C69, C70, C71, C75 |
| 5 | 220R | Mod:R_Yageo_L3.6mm_D1.6mm_P12.70mm_Horizontal | R56, R60, R63, R70, R71 |
| 5 | 22uF | Mod:CP_Axial_L11.0mm_D6.0mm_P20.32mm_Horizontal | C28, C34, C50, C65, C80 |
| 4 | LS157 | Mod:DIP-16_W7.62mm_Socket | IC3, IC4, IC25, IC26 |
| 4 | ZTX313 | Mod:TO-92Flat | TR1, TR2, TR3, TR6 |
| 3 | 15R | Mod:R_Yageo_L3.6mm_D1.6mm_P12.70mm_Horizontal | R61, R62, R64 |
| 3 | 2K2 | Mod:R_Yageo_L3.6mm_D1.6mm_P12.70mm_Horizontal | R51, R52, R79 |
| 3 | 47nF | Mod:C_Axial_L3.8mm_D2.6mm_P12.70mm_Horizontal | C29, C76, C101 |
| 2 | 100nF | Mod:C_Axial_L3.8mm_D2.6mm_P12.40mm_Horizontal | C31, C32 |
| 2 | 100pF | Mod:C_Axial_L3.8mm_D2.6mm_P12.70mm_Horizontal | C64, C67 |
| 2 | 100uF | Mod:CP_Axial_L11.0mm_D6.0mm_P20.32mm_Horizontal | C44, C45 |
| 2 | 10nF | Mod:C_Axial_L3.8mm_D2.6mm_P12.70mm_Horizontal | C39, C100 |
| 2 | 150pF | Mod:C_Axial_L3.8mm_D2.6mm_P12.70mm_Horizontal | C52, C53 |
| 2 | 16pF | Mod:C_Axial_L3.8mm_D2.6mm_P12.70mm_Horizontal | C72, C73 |
| 2 | 1uF | Mod:CP_Axial_L11.0mm_D6.0mm_P20.32mm_Horizontal | C46, C79 |
| 2 | 33pF | Mod:C_Axial_L3.8mm_D2.6mm_P12.70mm_Horizontal | C37, C38 |
| 2 | BA157 | Mod:D_DO-35_SOD27_P12.70mm_Horizontal | D15, D17 |
| 2 | BC184 | Mod:TR9 | TR8, TR9 |
| 2 | MountingHole_Pad | MountingHole:MountingHole_2.2mm_M2_ISO14580_Pad_TopBottom | H1, H2 |
| 1 | 0R | Mod:R_Yageo_L3.6mm_D1.6mm_P12.70mm_Horizontal | R32 |
| 1 | 10K | Mod:R_Yageo_L3.6mm_D1.6mm_P12.40mm_Horizontal | R35 |
| 1 | 10nF | Mod:C_Axial_L3.8mm_D2.6mm_P12.40mm_Horizontal | C35 |
| 1 | 14Mhz | Mod:X1 | X1 |
| 1 | 15R | Mod:R_Axial_DIN0516_L15.5mm_D5.0mm_P22.60mm_Horizontal | R34 |
| 1 | 180R | Mod:R_Yageo_L3.6mm_D1.6mm_P12.70mm_Horizontal | R25 |
| 1 | 1K | Mod:R_Yageo_L3.6mm_D1.6mm_P12.40mm_Horizontal | R37 |
| 1 | 1K8 | Mod:R_Yageo_L3.6mm_D1.6mm_P12.70mm_Horizontal | R59 |
| 1 | 1N4148 | Mod:D_DO-35_SOD27_P12.40mm_Horizontal | D13 |
| 1 | 1uF | Mod:CP_Axial_L11.0mm_D6.0mm_P20.00mm_Horizontal | C27 |
| 1 | 220K | Mod:R_Yageo_L3.6mm_D1.6mm_P12.70mm_Horizontal | R31 |
| 1 | 22uF | Mod:CP_Axial_L11.0mm_D6.0mm_P20.00mm_Horizontal | C25 |
| 1 | 390R | Mod:R_Yageo_L3.6mm_D1.6mm_P12.70mm_Horizontal | R53 |
| 1 | 3K | Mod:R_Yageo_L3.6mm_D1.6mm_P12.70mm_Horizontal | R43 |
| 1 | 4.43Mhz | Mod:X2 | X2 |
| 1 | 4.7uF | Mod:CP_Axial_L11.0mm_D6.0mm_P20.32mm_Horizontal | C74 |
| 1 | 470pF | Mod:C_Axial_L3.8mm_D2.6mm_P12.70mm_Horizontal | C54 |
| 1 | 47pF | Mod:C_Axial_L3.8mm_D2.6mm_P12.70mm_Horizontal | C63 |
| 1 | 4K7 | Mod:R_Yageo_L3.6mm_D1.6mm_P12.70mm_Horizontal | R48 |
| 1 | 560pF | Mod:C_Axial_L3.8mm_D2.6mm_P12.70mm_Horizontal | C49 |
| 1 | 5K1 | Mod:R_Yageo_L3.6mm_D1.6mm_P12.70mm_Horizontal | R44 |
| 1 | 5V1 | Mod:D_DO-35_SOD27_P12.70mm_Horizontal | D19 |
| 1 | 680R | Mod:R_Yageo_L3.6mm_D1.6mm_P12.70mm_Horizontal | R33 |
| 1 | 680R | Mod:R_Yageo_L3.6mm_D1.6mm_P12.40mm_Horizontal | R36 |
| 1 | 7805 | Mod:TO-220-3_Horizontal_TabDown | REG1 |
| 1 | 8K2 | Mod:R_Yageo_L3.6mm_D1.6mm_P12.70mm_Horizontal | R50 |
| 1 | Barrel_Jack_MountingPin | Mod:BarrelJack_Horizontal | J7 |
| 1 | EAR1 | Mod:3.5mm_socket | EAR1 |
| 1 | Edge_Connector | Mod:Edge Connector | E1 |
| 1 | JROM | Mod:ROM_WireLink | JROM1 |
| 1 | Keyboard5 | Mod:Keyboard5 | KB1 |
| 1 | Keyboard8 | Mod:Keyboard8 | KB2 |
| 1 | L1 | Mod:RFI-Link | L1 |
| 1 | L2 | Mod:RFI-Link | L2 |
| 1 | LM1889 | Mod:DIP-18_W7.62mm_Socket | IC14 |
| 1 | LS00 | Mod:DIP-14_W7.62mm_Socket | IC24 |
| 1 | LS32 | Mod:DIP-14_W7.62mm_Socket | IC23 |
| 1 | MIC1 | Mod:3.5mm_socket | MIC1 |
| 1 | OKI | Mod:Wire_Link_7.62mm | OKI1 |
| 1 | OKI-H | Mod:Wire_Link_7.62mm | OKI-H1 |
| 1 | OKI-L | Mod:Wire_Link_7.62mm | OKI-L1 |
| 1 | ROM | Mod:DIP-28_W15.24mm_Socket | IC5 |
| 1 | SW_SPDT | Mod:SHM1260H | SW1 |
| 1 | Speaker | Mod:Speaker | LS1 |
| 1 | TI | Mod:Wire_Link_7.62mm | TI1 |
| 1 | TI-3 | Mod:Wire_Link_7.62mm | TI-3 |
| 1 | TI-4 | Mod:Wire_Link_7.62mm | TI-4 |
| 1 | TV | Mod:Modulator4B | TV1 |
| 1 | Transformer_1P_1S | Mod:Coil | T1 |
| 1 | ULA | Mod:DIP-40_W15.24mm_Socket | IC1 |
| 1 | Z80 | Mod:DIP-40_W15.24mm_Socket | IC2 |
| 1 | ZTX213 | Mod:TO-92Flat | TR5 |
The 205 most common of 207 parts.
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Questions
How big is the Issue4B PCB?
It measures 213.1 × 130 mm and has 2 copper layers, 1.6 mm thick.
What parts does the Issue4B use?
207 parts, built around the BC184. 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 Issue4B KiCad files?
From the liveboxandy/ZX-Spectrum-48K-Issue-4B repository on GitHub, at the commit this page was made from: the board is Issue4B.kicad_pcb and its schematic Issue4B.kicad_sch. PCBKit opens the board in the browser, with nothing to install.
Can I use the Issue4B design in my own project?
Its repository publishes it under the CC0-1.0 licence: you may reuse it on that licence's terms (keep the author's notice, and for a copyleft licence share your changes alike).