2 layers34 × 16 mm
RiscPcVideoBusRepair
TheCodeSharman/RiscPc
This repository contains a collection of resources usefull for Risc PC repair.
27 parts
2 layers120 × 80 mm
Headphone amp.circuit
TheCodeSharman/RiscPcThis repository contains a collection of resources usefull for Risc PC repair.
- Size
- 120 × 80 mm
- Copper layers
- 2
- Thickness
- 1.6 mm
- Parts
- 27
- Nets
- 25
- Pads
- 110
- Tracks, vias
- 242, 30
- Routed
- Yes
- KiCad
- KiCad 0.0.1 (file 20241229)
- Created
- 8 Jun 2025
- Updated
- 10 Oct 2026
Overview
Headphone amp.circuit is an open-source printed circuit board by TheCodeSharman, from the TheCodeSharman/RiscPc repository on GitHub. It is a 2-layer board of 120 × 80 mm with 27 parts on 25 nets, routed with 242 tracks and 30 vias.
It is built around the U1D. Its parts include 4 ICs, 2 transistors and 2 inductors. It belongs with the audio and music boards of this library.
Main components
1README
README.mdRiscPc Repair Resources
This repository contains a collection of resources usefull for Risc PC repair.
The Risc OS 3.6.0 ROM source code is available at external/Kernel.
In order to view the POST messages refer to ACORN_POST.md that documents using a logic analsyer with a couple of resisters and a diode. This avoids needing to obtain/build a POST unit.
Parts
27| Qty | Value | Footprint | References |
|---|---|---|---|
| 4 | 47kΩ | tscircuit:resistor_res0603 | R_fb_LEFT, R_fb_RIGHT, R_in_LEFT, R_in_RIGHT |
| 2 | 100pF | tscircuit:capacitor_cap0603 | C_f_LEFT, C_f_RIGHT |
| 2 | 15kΩ | tscircuit:resistor_res0603 | R_bias_LEFT, R_bias_RIGHT |
| 2 | 2.1kΩ | tscircuit:resistor_res0603 | R_iv_LEFT, R_iv_RIGHT |
| 2 | 2.2µH | tscircuit:inductor_0805 | L13, L14 |
| 2 | 3.3Ω | tscircuit:resistor_res0603 | R_s2_LEFT, R_s2_RIGHT |
| 2 | 33Ω | tscircuit:resistor_res0603 | R_s1_LEFT, R_s1_RIGHT |
| 2 | 340Ω | tscircuit:resistor_res0603 | R_pull_LEFT, R_pull_RIGHT |
| 2 | 47uF | tscircuit:capacitor_cap0805 | C_ac_LEFT, C_ac_RIGHT |
| 1 | Q1 | tscircuit:transistor_sot23 | Q1 |
| 1 | Q4 | tscircuit:transistor_sot23 | Q4 |
| 1 | TDA1545A | tscircuit:TDA1545A | DAC |
| 1 | U1A | tscircuit:op_amp_soic14 | U1A |
| 1 | U1B | tscircuit:op_amp_soic14 | U1B |
| 1 | U1C | tscircuit:op_amp_soic14 | U1C |
| 1 | U1D | tscircuit:op_amp_soic14 | U1D |
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Questions
How big is the Headphone amp.circuit PCB?
It measures 120 × 80 mm and has 2 copper layers, 1.6 mm thick.
What parts does the Headphone amp.circuit use?
27 parts, built around the U1D. 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 Headphone amp.circuit KiCad files?
From the TheCodeSharman/RiscPc repository on GitHub, at the commit this page was made from: the board is repair/riscpc-sound-repair/schematic/tscircuit/kicad-project/headphone-amp.circuit.kicad_pcb and its schematic repair/riscpc-rtc-repair/RiscPcRtcRepair.kicad_sch. PCBKit opens the board in the browser, with nothing to install.
Can I use the Headphone amp.circuit design in my own project?
Its repository states no licence, so its author keeps all rights: ask TheCodeSharman before reusing the design.