2 layers18.5 × 75.5 mm
Exits board B
ramphands/Exits
4hp DIY eurorack line and headphone output module based on the Nearness and AJH headphone amp modules
24 parts33
2 layers18.5 × 110 mm
Exits board A
ramphands/Exits334hp DIY eurorack line and headphone output module based on the Nearness and AJH headphone amp modules
- Size
- 18.5 × 110 mm
- Copper layers
- 2
- Thickness
- 1.6 mm
- Parts
- 42
- Nets
- 29
- Pads
- 126
- Tracks, vias
- 213, 29
- Pours
- 2
- Routed
- Yes
- KiCad
- KiCad 6 (file 20211014)
- Created
- 27 Jan 2022
- Updated
- 20 Apr 2022
Overview
Exits board A is an open-source printed circuit board by ramphands, from the ramphands/Exits repository on GitHub. It is a 2-layer board of 18.5 × 110 mm with 42 parts on 29 nets, routed with 213 tracks and 29 vias.
It is built around the LME49720NA, NJM4556AV-TE1 and 1N5819HW, with the SJ-63083A and ADP0204 among its other parts. Its parts include 16 resistors, 14 capacitors, 5 connectors, 4 ICs and 2 diodes. It belongs with the audio and music boards of this library.
Main components
5
LME49720NA
PDIP-8-17V~-2.5V、2.5V~17V -40℃~+85℃ 0.00003% 10mA 120dB 2-Channel PDIP-8 Operational Amplifier ROHSTexas InstrumentsAudio Amplifiers
NJM4556AV-TE1
SSOP-8SSOP-8 New Arrivals ROHSNisshinbo Micro Devices Inc.Uncategorised
1N5819HW
SOD-123-65℃~+150℃ 1 Independent 1A 1mA@40V 25A 40V 450mV@1A SOD-123 Schottky Diodes ROHSDiodes IncorporatedSchottky Diodes
SJ-63083A
--25℃~+70℃ 12V 1A Brass、Phosphor Bronze Silver - Audio Connectors ROHSCUIAudio Connectors (Headphones)ADP0204
插件插件 DIP Switches ROHSTE ConnectivityDIP Switches
README
README.mdExits
4hp DIY eurorack line and headphone output module based on the Nearness and Forestcaver headphone amp designs
The Nearness section is a "minimal panning mixer for the Eurorack modular synthesizer system. Seven inputs, two outputs. The closer an input is to an output, the greater its influence on it."
The Forestcaver headphone amp is a "NJM4556 based headphone amp. This is essentially the power section from the nwavguy o2 headphone amp. It has a very low output impedance (~1 ohm) so can drive even low impedance headphones. It can deliver a high power (utilising two sections of the njm4556 per channel) so can drive 600 ohm impedance headphones with no problem. There is a high pass filter on the input to block dc."
These have been combined in a single 4hp module which utilises 6.35mm stereo jacks for both the line and headphone outputs.
Schematic and PCBs
The kicad directory contains the schematic and PCB layout as a KiCad 6 project.
Panel
Available in the panel directory as a PDF and an SVG vector file.
Revisions and notes
This version is an updated version of my original prototype. Notable changes as follows:
- Updated pin header widths to improve security/stability between the two boards.
- Changed the type of jacks used for the output to a more widely-available device, the SJ-63083A.
- Adjusted positioning of the potentiometer to provide more space between the shaft and the nearest input jacks.
- Reversed the headphone and line output jacks to the more logical orientation; headphone jack is nearest the headphone volume knob
Please note that these changes, while minor, have not been tested, so build at your own risk.
License
Parts
42| Qty | Value | Footprint | References |
|---|---|---|---|
| 8 | 100k | nearness:0603 | R17, R18, R19, R20, R21, R22, R27, R28 |
| 8 | 100n | nearness:0603 | C7, C8, C9, C10, C11, C12, C13, C14 |
| 4 | 1 | Resistor_SMD:R_1206_3216Metric | R23, R24, R25, R26 |
| 2 | 100k | Resistor_SMD:R_1206_3216Metric | R15, R16 |
| 2 | 100n | Capacitors_SMD:C_1206 | C1, C2 |
| 2 | 1N5819HW | nearness:SOD-123 | D1, D2 |
| 2 | 1k | nearness:0603 | R29, R30 |
| 2 | 22p | nearness:0603 | C3, C4 |
| 2 | 22u | nearness:0805 | C5, C6 |
| 2 | LME49720 | nearness:SOIC-8 | U3, U4 |
| 2 | NJM4556AV-TE1 | SamacSys_Parts:SOP65P640X145-8N | IC1, IC2 |
| 2 | SJ-63083A | Connector:CUI_SJ-63083A | J13, J14 |
| 1 | ADP0204 | SamacSys_Parts:ADP0204 | S1 |
| 1 | Conn_01x03_Male | Connector_PinHeader_2.54mm:PinHeader_1x04_P2.54mm_Vertical | J8 |
| 1 | Conn_01x04_Male | Connector_PinHeader_2.54mm:PinHeader_1x06_P2.54mm_Vertical | J11 |
| 1 | Conn_02x05_Odd_Even | Connector_IDC:IDC-Header_2x05_P2.54mm_Vertical | J12 |
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Questions
How big is the Exits board A PCB?
It measures 18.5 × 110 mm and has 2 copper layers, 1.6 mm thick.
What parts does the Exits board A use?
42 parts, built around the LME49720NA, NJM4556AV-TE1, 1N5819HW and SJ-63083A. 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 Exits board A KiCad files?
From the ramphands/Exits repository on GitHub, at the commit this page was made from: the board is kicad/exits board A.kicad_pcb and its schematic kicad/exits.kicad_sch. PCBKit opens the board in the browser, with nothing to install.
Can I use the Exits board A design in my own project?
Its repository states no licence, so its author keeps all rights: ask ramphands before reusing the design.