2 layers140 × 75 mm
2 layers178 × 127 mm
3APSU
codesqueak/3APSUReplicate Nascom 3A PSU
- Size
- 178 × 127 mm
- Copper layers
- 2
- Thickness
- 1.6 mm
- Parts
- 55
- Nets
- 17
- Pads
- 100
- Tracks, vias
- 274, 4
- Pours
- 5
- Routed
- Yes
- KiCad
- KiCad 9.0 (file 20241229)
- Created
- 21 Jul 2024
- Updated
- 6 Apr 2025
Overview
3APSU is an open-source printed circuit board by codesqueak, from the codesqueak/3APSU repository on GitHub. It is a 2-layer board of 178 × 127 mm with 55 parts on 17 nets, routed with 274 tracks and 4 vias.
It is built around the L7812, L7905 and L7912. Its parts include 16 capacitors, 10 diodes, 10 connectors, 5 resistors and 4 ICs. It belongs with the power boards of this library.
Main components
3
L7812
TO-220ST0℃~+125℃@(Tj) 1 1.2A 12V 2V@(1A) 30V 71dB@(120Hz) 76uV Fixed Positive Short Circuit Protection TO-220ST Voltage Regulators - Linear, Low Drop Out (LDO) Regulators ROHSOSENVoltage Regulators - Linear, Low Drop Out (LDO) RegulatorsL7905
TO-220TO-220 Voltage Regulators - Linear, Low Drop Out (LDO) Regulators ROHSKTPUncategorised
L7912
TO-220ST0℃~+125℃@(Tj) 1 1.2A 12V 200uV 2V@(1A) 35V 3mA 60dB@(120Hz) Fixed Negative Over Voltage Protection、Short Circuit Protection TO-220ST Voltage Regulators - Linear, Low Drop Out (LDO) Regulators ROHSOSENVoltage Regulators - Linear, Low Drop Out (LDO) Regulators
README
README.mdNascom 3A PSU
Nascom 3A PSU replica
Introduction
This board is a form, fit and function replacement for the original Nascom 3A PSU. Many of these boards are now showing their age and this is the perfect replacement for those wanting the original hardware.
Kicad View
Front PCB
Back PCB
Built PCB
Parts
55| Qty | Value | Footprint | References |
|---|---|---|---|
| 8 | MountingHole | MountingHole:MountingHole_3.5mm | BR1, H1, H2, H3, H4, TR1, TR2, TR3 |
| 6 | 2.2uF | Capacitor_THT:CP_Radial_Tantal_D7.0mm_P5.00mm | C3, C4, C7, C8, C11, C12 |
| 4 | 0.1uF | Nascom:C_Disc_D9.0mm_W3.0mm_P6.00mm | C5, C9, C13, C16 |
| 4 | 1N4001 | Diode_THT:D_DO-41_SOD81_P12.70mm_Horizontal | D3, D5, D7, D10 |
| 4 | LED | LED_THT:LED_D5.0mm | D4, D6, D8, D9 |
| 2 | 1000uF | Capacitor_THT:CP_Axial_L34.5mm_D20.0mm_P41.00mm_Horizontal | C6, C10 |
| 2 | 15VAC | TestPoint:TestPoint_THTPad_D3.0mm_Drill1.5mm | P3, P5 |
| 2 | 2.2uF | Nascom:CP_Radial_Tantal_D8.0mm_P6.00mm | C14, C15 |
| 2 | 270 | Nascom:R_Axial_DIN0207_L6.3mm_D2.5mm_P14mm_Horizontal | R1, R3 |
| 2 | 3300uF | Capacitor_THT:CP_Axial_L46.0mm_D20.0mm_P52.00mm_Horizontal | C1, C2 |
| 2 | 9VAC | TestPoint:TestPoint_THTPad_D3.0mm_Drill1.5mm | P1, P2 |
| 1 | +12V | TestPoint:TestPoint_THTPad_D3.0mm_Drill1.5mm | P8 |
| 1 | +5V | TestPoint:TestPoint_THTPad_D3.0mm_Drill1.5mm | P6 |
| 1 | -12V | TestPoint:TestPoint_THTPad_D3.0mm_Drill1.5mm | P10 |
| 1 | -5V | TestPoint:TestPoint_THTPad_D3.0mm_Drill1.5mm | P9 |
| 1 | 0V | TestPoint:TestPoint_THTPad_D3.0mm_Drill1.5mm | P7 |
| 1 | 10 | Nascom:R_Axial_Power_L31.0mm_W8.0mm_P36mm | R4 |
| 1 | 1K | Resistor_THT:R_Axial_DIN0207_L6.3mm_D2.5mm_P15.24mm_Horizontal | R5 |
| 1 | 1K | Nascom:R_Axial_DIN0207_L6.3mm_D2.5mm_P14mm_Horizontal | R2 |
| 1 | D_Bridge_-A+A | Diode_THT:Diode_Bridge_15.2x15.2x6.3mm_P10.9mm | D1 |
| 1 | D_Bridge_-AA+ | Nascom:Bridge_Rectifier_BR81D | D2 |
| 1 | GND | TestPoint:TestPoint_THTPad_D3.0mm_Drill1.5mm | P4 |
| 1 | L7812 | Nascom:TO-220-3_Horizontal_TabDown_staggered | U2 |
| 1 | L7905 | Nascom:TO-220-3_Horizontal_TabDown_staggered | U3 |
| 1 | L7912 | Nascom:TO-220-3_Horizontal_TabDown_staggered | U4 |
| 1 | LM323K | Package_TO_SOT_THT:TO-3 | U1 |
| 1 | LOGO | Nascom:nm logo | G001 |
| 1 | LOGO | Nascom:psu long logo inverted back copper | G002 |
Questions
How big is the 3APSU PCB?
It measures 178 × 127 mm and has 2 copper layers, 1.6 mm thick.
What parts does the 3APSU use?
55 parts, built around the L7812, L7905 and L7912. 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 3APSU KiCad files?
From the codesqueak/3APSU repository on GitHub, at the commit this page was made from: the board is kicad/3APSU.kicad_pcb and its schematic kicad/3APSU.kicad_sch. PCBKit opens the board in the browser, with nothing to install.
Can I use the 3APSU design in my own project?
Its repository states no licence, so its author keeps all rights: ask codesqueak before reusing the design.
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