2 layers42.2 × 68.1 mm
RT4K donut dongle
svirant/DonutDongle
Arduino Nano based hub that connects your digital and analog console switching setup with the RetroTink 4K and/or RetroTink 5x/OSSC for Auto Profile switching
49 parts17GPL-3.0
2 layers100 × 100 mm
A relay board for performing blind A/B testing of two audio sources.
- Size
- 100 × 100 mm
- Copper layers
- 2
- Thickness
- 1.6 mm
- Parts
- 85
- Nets
- 56
- Pads
- 266
- Tracks, vias
- 644, 14
- Routed
- Yes
- KiCad
- KiCad 3
- Created
- 31 Oct 2020
- Updated
- 17 Nov 2020
Overview
Abx is an open-source printed circuit board by cellularmitosis, from the cellularmitosis/abx-tayda repository on GitHub, published under the MIT licence. It is a 2-layer board of 100 × 100 mm with 85 parts on 56 nets, routed with 644 tracks and 14 vias.
It is built around the PJ-307. Its parts include 28 resistors, 19 diodes, 12 transistors, 11 connectors and 9 switches. It belongs with the audio and music and home automation and IoT boards and the AVR (ATmega, ATtiny) boards of this library.
Main components
1README
README.mdabx-tayda
A relay board for performing blind A/B testing of two audio sources.
This version of the board is designed around parts available from Tayda electronics.
See the thread at diyaudio.com.
This board design is open source hardware, released under the terms of the MIT license. It requires an ancient version of Kicad (sorry, not sorry 😝). Debian users will need to add a jessie source to install the libpng12 dependency.
v4.1 release
Changes from v4:
- Include missing base resistor R28.
Bill of materials
- D4-6: three 1N5817 Schottky diodes.
- Any diode will work, but the lower voltage drop of Schottky diodes extracts more useful life from the 9V battery.
- Tayda
- D7-10: four LED's.
- Any color. 3mm or 5mm.
- Tayda
- D11-22: twelve 1N4148 diodes.
- Flyback diodes. Any diode will work here.
- Tayda
- R1-4: four 220R 1/4 watt resistors.
- LED current limiting. Tune the resistance value to get the LED brightness you prefer.
- Tayda
- R5-7,20-22: six 100k 1/4 watt resistors.
- Voltage dividers for Arduino inputs. 5% carbon film or 1% metal film.
- Tayda
- R8-19: twelve 100k 1/4 watt resistors.
- MOSFET gate pull-up and pull-down resistors. 5% carbon film or 1% metal film.
- Tayda
- R23-27: six 10k 1/4 watt resistors.
- PNP base current-limiting resistors. 5% carbon film or 1% metal film.
- Tayda
- SW1-3: three miniature micro switches.
- Tayda MX1382-F91
- Q1,3,5,7,9,11: six 2N3906 PNP BJT transistors.
- Tayda
- Any TO-92 PNP transistor which can handle 100mA (with an EBC pinout) will work fine.
- Q2,4,6,8,10,12: six 2N7000 N-channel MOSFETs.
- Tayda
- Any TO-92 N-channel MOSFET which can handle 100mA (with an SGD pinout) will work fine.
- K1-6: six 3V latching relays
- Tayda FTR-B3GB003Z
- CON1-3: three 3.5mm headphone jacks
- IC1: one Arduino Nano board.
- Any $5 Arduino Nano board on ebay will work fine.
Choose one:
v4 release
Changes from v3:
- Use 2N3906 PNP BJT's which are cheaper than BS250 P-channel MOSFETs (and are available from tayda)
- Use wider traces for the signal path.
v3 release
Changes from v2:
- Add test points to input X and Y for volume matching convenience.
- Use pins RX0, TX1 instead of A6, A7 (which cannot be used a digital outputs).
v2 release
This release fixes a couple of bugs from v1:
- Replaced the 100k input resistors with proper voltage dividers.
- Fixed the silkscreen outline of the relays.
Parts
85| Qty | Value | Footprint | References |
|---|---|---|---|
| 18 | 100k | R_AXIAL_0W25_059A_PL | R5, R6, R7, R10, R11, R12, R13, R14, R15, R16, R17, R18, R19, R20, R21, R22 +2 |
| 12 | 1N4148 | DIODE_1A_069A_04_PL | D11, D12, D13, D14, D15, D16, D17, D18, D19, D20, D21, D22 |
| 6 | 10k | R_AXIAL_0W25_059A_PL | R23, R24, R25, R26, R27, R28 |
| 6 | 2N3906 | TO-92_Q_EBC_059Bo_PL | Q1, Q3, Q5, Q7, Q9, Q11 |
| 6 | 2N7000 | TO-92_Q_SGD_059Bo_PL | Q2, Q4, Q6, Q8, Q10, Q12 |
| 6 | FTR-B3GB003Z | FTR-B3G | K1, K2, K3, K4, K5, K6 |
| 4 | 220 | R_AXIAL_0W25_059A_PL | R1, R2, R3, R4 |
| 4 | Val** | hole_M3_NPTH | H***, H***, H***, H*** |
| 3 | 1N5817 | DIODE_1A_069A_04_PL | D4, D5, D6 |
| 3 | PJ-307 | SJ1-3523N | CON3, IN_X1, IN_Y1 |
| 1 | 2.1x5.5mm | BARREL_JACK_21x55 | CON4 |
| 1 | ARDUINO_NANO | ARDUINO_NANO_PL | IC1 |
| 1 | CONN_2X1 | PIGTAIL2 | P1 |
| 1 | LEDA | LED_5MM | D7 |
| 1 | LEDB | LED_5MM | D8 |
| 1 | LEDX | LED_5MM | D9 |
| 1 | LEDY | LED_5MM | D10 |
| 1 | OSHW-logo_silkscreen-front_8mm | OSHW-logo_silkscreen-front_8mm | G*** |
| 1 | REROLL | MX1382-F91 | SW3 |
| 1 | REVEAL | MX1382-F91 | SW2 |
| 1 | SWITCH | MX1382-F91 | SW1 |
| 1 | XG | 1pin_032_058 | P7 |
| 1 | XL | 1pin_032_058 | P5 |
| 1 | XR | 1pin_032_058 | P6 |
| 1 | YG | 1pin_032_058 | P4 |
| 1 | YL | 1pin_032_058 | P2 |
| 1 | YR | 1pin_032_058 | P3 |
Questions
How big is the Abx PCB?
It measures 100 × 100 mm and has 2 copper layers, 1.6 mm thick.
What parts does the Abx use?
85 parts, built around the PJ-307. 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 Abx KiCad files?
From the cellularmitosis/abx-tayda repository on GitHub, at the commit this page was made from: the board is abx.kicad_pcb. PCBKit opens the board in the browser, with nothing to install.
Can I use the Abx 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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