2 layers94.6 × 54.7 mm
2 layers83.8 × 64.8 mm
Ta191
TuchAudio/ta191Low Noise, improved Moving-Coil Phono Pre-Amp
- Size
- 83.8 × 64.8 mm
- Copper layers
- 2
- Thickness
- 1.6 mm
- Parts
- 74
- Nets
- 36
- Pads
- 185
- Tracks, vias
- 369, 13
- Pours
- 7
- Routed
- Yes
- KiCad
- KiCad 8.0 (file 20240108)
- Created
- 8 Nov 2025
- Updated
- 29 Nov 2025
Overview
Ta191 is an open-source printed circuit board by TuchAudio, from the TuchAudio/ta191 repository on GitHub, published under the MIT licence. It is a 2-layer board of 83.8 × 64.8 mm with 74 parts on 36 nets, routed with 369 tracks and 13 vias.
It is built around the BC559, SRD-S-112D and BC548, with the BC558 among its other parts. Its parts include 28 resistors, 16 transistors, 10 capacitors, 7 connectors and 6 diodes.
Main components
4
BC559
TO-92-31 PNP 100mA 110 150MHz 15nA 30V 500mW 5V 650mV PNP Standalone TO-92-3 Bipolar (BJT) ROHSonsemiBipolar (BJT)
SRD-S-112D
插件,15.4x19.6mm插件,15.4x19.6mm Power Relays ROHSSANYOU RELAYSPower RelaysBC548
TO-92TO-92 Bipolar (BJT) ROHSDDFBipolar (BJT)BC558
TO-921 PNP 100mA 100nA 150MHz 30V 500mW 5V 800 90mV、250mV PNP TO-92 Bipolar (BJT) ROHSDDFBipolar (BJT)
README
README.mdta191
Low Noise, improved Moving-Coil Phono Pre-Amp
Purpose
An optional previous stage for MM Phono preamps like TuchAudio 101b, allowing the use of Moving Coil cartridges. With suitable wiring it could be used with other preamps as well, like the 103 board.
A built-in relay allows the same input connector to be used with both MC (thru amplification) and MM cartridges (bypassing it straight to the MM Phono stage)
Design
The use of four common-base stages in parallel provides low input impedance (100 Ω) and improved signal-to-noise ratio (by 6 dB).
Symmetrical power supply thru serial regulation provides high PSRR.
Specs
- Power supply: +/-9V, symmetrical (just a few mA)
- Gain: x33 (+34 dB)
- Input Sensitivity: 0.11 mV over 100 Ω (for a 3.6 mV output, suitable for TuchAudio 101b preamp or TuchAudio 103)
- Nominal Output level: 3.6 mV over 110 kΩ (from a 0.11 mV input)
- Output impedance: 3.3 kΩ. Lower load impedances are allowed, but diminished output level and impaired bass response are to be expected.
Parts
74| Qty | Value | Footprint | References |
|---|---|---|---|
| 14 | BC559 | Package_TO_SOT_THT:TO-92_Inline | Q1, Q2, Q3, Q4, Q5, Q6, Q7, Q51, Q52, Q53, Q54, Q55, Q56, Q57 |
| 12 | 27K | Resistor_THT:R_Axial_DIN0207_L6.3mm_D2.5mm_P10.16mm_Horizontal | R5, R6, R7, R8, R10, R12, R55, R56, R57, R58, R60, R62 |
| 8 | 390 | Resistor_THT:R_Axial_DIN0207_L6.3mm_D2.5mm_P10.16mm_Horizontal | R1, R2, R3, R4, R51, R52, R53, R54 |
| 4 | 10µ | Capacitor_THT:CP_Radial_D4.0mm_P1.50mm | C1, C3, C5, C55 |
| 4 | 1N4148 | Diode_THT:D_DO-35_SOD27_P7.62mm_Horizontal | D3, D4, D53, D54 |
| 4 | 22n | Capacitor_THT:C_Disc_D6.0mm_W2.5mm_P5.00mm | C2, C4, C6, C56 |
| 4 | SRD-S-112D | Relay_THT:Relay_SPDT_SANYOU_SRD_Series_Form_C | K1, K2, K51, K52 |
| 2 | 2K7 | Resistor_THT:R_Axial_DIN0207_L6.3mm_D2.5mm_P10.16mm_Horizontal | R11, R61 |
| 2 | 330K | Resistor_THT:R_Axial_DIN0207_L6.3mm_D2.5mm_P10.16mm_Horizontal | R13, R63 |
| 2 | 470n | Capacitor_THT:C_Rect_L7.2mm_W3.0mm_P5.00mm_FKS2_FKP2_MKS2_MKP2 | C7, C17 |
| 2 | 680 | Resistor_THT:R_Axial_DIN0207_L6.3mm_D2.5mm_P10.16mm_Horizontal | R14, R15 |
| 2 | 6K8 | Resistor_THT:R_Axial_DIN0207_L6.3mm_D2.5mm_P10.16mm_Horizontal | R9, R59 |
| 2 | 6V8 | Diode_THT:D_DO-35_SOD27_P7.62mm_Horizontal | D1, D2 |
| 2 | MountingHole_Pad | MountingHole:MountingHole_3.2mm_M3_DIN965_Pad | H1, H2 |
| 1 | +12V | Connector_PinHeader_2.54mm:PinHeader_1x02_P2.54mm_Vertical | J8 |
| 1 | BC548 | Package_TO_SOT_THT:TO-92_Inline | Q8 |
| 1 | BC558 | Package_TO_SOT_THT:TO-92_Inline | Q9 |
| 1 | MC/MM IN | durango:2xRCA_vertical | J2 |
| 1 | MM OUT | durango:2xRCA_vertical | J3 |
| 1 | MountingHole | MountingHole:MountingHole_3.2mm_M3 | H3 |
| 1 | OUTPUT | Connector_PinHeader_2.54mm:PinHeader_1x03_P2.54mm_Vertical | J4 |
| 1 | PHONO | durango:DIN 5-180deg | J1 |
| 1 | POWER | Connector_PinHeader_2.54mm:PinHeader_1x02_P2.54mm_Vertical | J5 |
| 1 | ~{MC} | Connector_PinHeader_2.54mm:PinHeader_1x02_P2.54mm_Vertical | J6 |
Questions
How big is the Ta191 PCB?
It measures 83.8 × 64.8 mm and has 2 copper layers, 1.6 mm thick.
What parts does the Ta191 use?
74 parts, built around the BC559, SRD-S-112D, BC548 and BC558. 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 Ta191 KiCad files?
From the TuchAudio/ta191 repository on GitHub, at the commit this page was made from: the board is kicad/ta191.kicad_pcb and its schematic kicad/ta191.kicad_sch. PCBKit opens the board in the browser, with nothing to install.
Can I use the Ta191 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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