2 layers83.8 × 64.8 mm
2 layers94.6 × 54.7 mm
Ta502cd
TuchAudio/ta502cdTwo-channel stereo mixer, switched
- Size
- 94.6 × 54.7 mm
- Copper layers
- 2
- Thickness
- 1.6 mm
- Parts
- 73
- Nets
- 43
- Pads
- 187
- Tracks, vias
- 445, 30
- Pours
- 2
- Routed
- Yes
- KiCad
- KiCad 8.0 (file 20240108)
- Created
- 8 Nov 2025
- Updated
- 24 Nov 2025
Overview
Ta502cd is an open-source printed circuit board by TuchAudio, from the TuchAudio/ta502cd repository on GitHub, published under the MIT licence. It is a 2-layer board of 94.6 × 54.7 mm with 73 parts on 43 nets, routed with 445 tracks and 30 vias.
It is built around the BC548, BC558 and SRD-S-112D. Its parts include 29 resistors, 14 capacitors, 14 transistors, 6 connectors and 2 diodes.
Main components
3README
README.mdParts
73| Qty | Value | Footprint | References |
|---|---|---|---|
| 12 | BC548 | Package_TO_SOT_THT:TO-92_Inline | Q1, Q2, Q3, Q4, Q5, Q6, Q51, Q52, Q53, Q54, Q55, Q56 |
| 10 | 33K | Resistor_THT:R_Axial_DIN0207_L6.3mm_D2.5mm_P10.16mm_Horizontal | R3, R6, R7, R10, R11, R53, R56, R57, R60, R61 |
| 4 | 10µ | Capacitor_THT:CP_Radial_D4.0mm_P1.50mm | C6, C7, C56, C57 |
| 4 | 150K | Resistor_THT:R_Axial_DIN0207_L6.3mm_D2.5mm_P10.16mm_Horizontal | R2, R5, R52, R55 |
| 4 | 3K3 | Resistor_THT:R_Axial_DIN0207_L6.3mm_D2.5mm_P10.16mm_Horizontal | R12, R14, R62, R64 |
| 4 | 470n | Capacitor_THT:C_Rect_L7.2mm_W3.0mm_P5.00mm_FKS2_FKP2_MKS2_MKP2 | C1, C2, C51, C52 |
| 4 | 68K | Resistor_THT:R_Axial_DIN0207_L6.3mm_D2.5mm_P10.16mm_Horizontal | R1, R4, R51, R54 |
| 2 | 1N4148 | Diode_THT:D_DO-35_SOD27_P7.62mm_Horizontal | D1, D51 |
| 2 | 220µ | Capacitor_THT:CP_Radial_D6.3mm_P2.50mm | C8, C58 |
| 2 | 27K | Resistor_THT:R_Axial_DIN0207_L6.3mm_D2.5mm_P10.16mm_Horizontal | R13, R63 |
| 2 | 2µ2 | Capacitor_THT:CP_Radial_D4.0mm_P1.50mm | C3, C53 |
| 2 | 330 | Resistor_THT:R_Axial_DIN0309_L9.0mm_D3.2mm_P5.08mm_Vertical | R15, R65 |
| 2 | 330K | Resistor_THT:R_Axial_DIN0207_L6.3mm_D2.5mm_P10.16mm_Horizontal | R8, R58 |
| 2 | BC558 | Package_TO_SOT_THT:TO-92_Inline | Q7, Q57 |
| 2 | MountingHole_Pad | MountingHole:MountingHole_3.2mm_M3_DIN965_Pad | H1, H2 |
| 2 | SRD-S-112D | Relay_THT:Relay_SPDT_SANYOU_SRD_Series_Form_C | K1, K51 |
| 1 | 10KA | durango:Potentiometer_Alps_225G_Dual_Horizontal | RV3 |
| 1 | 22n | Capacitor_THT:C_Disc_D6.0mm_W2.5mm_P5.00mm | C5 |
| 1 | 390 | Resistor_THT:R_Axial_DIN0207_L6.3mm_D2.5mm_P10.16mm_Horizontal | R9 |
| 1 | 470µ | Capacitor_THT:CP_Radial_D6.3mm_P2.50mm | C4 |
| 1 | INPUT 1 | Connector_PinHeader_2.54mm:PinHeader_1x03_P2.54mm_Vertical | J1 |
| 1 | INPUT 2 | Connector_PinHeader_2.54mm:PinHeader_1x03_P2.54mm_Vertical | J2 |
| 1 | LINE IN | Connector_PinHeader_2.54mm:PinHeader_1x03_P2.54mm_Vertical | J6 |
| 1 | MONITOR 2x40K | Connector_PinHeader_2.54mm:PinHeader_1x06_P2.54mm_Vertical | RV2 |
| 1 | MountingHole | MountingHole:MountingHole_3.2mm_M3_DIN965 | H3 |
| 1 | OUTPUT | Connector_PinHeader_2.54mm:PinHeader_1x03_P2.54mm_Vertical | J3 |
| 1 | OUTPUT 2x40K | Connector_PinHeader_2.54mm:PinHeader_1x06_P2.54mm_Vertical | RV1 |
| 1 | PHONES | Connector_Audio:Jack_3.5mm_CUI_SJ1-3525N_Horizontal | J5 |
| 1 | POWER | Connector_PinHeader_2.54mm:PinHeader_1x02_P2.54mm_Vertical | J4 |
Questions
How big is the Ta502cd PCB?
It measures 94.6 × 54.7 mm and has 2 copper layers, 1.6 mm thick.
What parts does the Ta502cd use?
73 parts, built around the BC548, BC558 and SRD-S-112D. 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 Ta502cd KiCad files?
From the TuchAudio/ta502cd repository on GitHub, at the commit this page was made from: the board is kicad/ta502cd.kicad_pcb and its schematic kicad/ta502cd.kicad_sch. PCBKit opens the board in the browser, with nothing to install.
Can I use the Ta502cd 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).
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