2 layers10.2 × 114.3 mm
Owlets
apaleslimghost/synths
schematics, PCBs, designs and code for Pale Slim Ghost Synthesisers hardware
39 parts5
2 layers100 × 100 mm
Athena
JanKoppe/athena22.1 audio crossover and headphone amplifier
- Size
- 100 × 100 mm
- Copper layers
- 2
- Thickness
- 1.6 mm
- Parts
- 136
- Nets
- 59
- Pads
- 287
- Tracks, vias
- 330, 11
- Pours
- 6
- Routed
- Yes
- KiCad
- KiCad 4
- Created
- 22 Feb 2018
- Updated
- 9 May 2018
Overview
Athena is an open-source printed circuit board by JanKoppe, from the JanKoppe/athena repository on GitHub. It is a 2-layer board of 100 × 100 mm with 136 parts on 59 nets, routed with 330 tracks and 11 vias.
It is built around the NE5532, OPA2134UA and TL072, with the NRJ6HF among its other parts. Its parts include 24 resistors, 18 capacitors, 9 connectors, 6 ICs and 3 diodes. It belongs with the audio and music boards of this library.
Main components
4
NE5532
SOP-8-22V~22V 0℃~+70℃ 100dB 10nA 14mA 2 40V/us 42mA 4mV 800nA 8nV/√Hz@30Hz Built-in compensation SOP-8 Operational Amplifier ROHSSungineOperational Amplifier
OPA2134UA
SOIC-8-18V~-2.5V、2.5V~18V -40℃~+85℃ 100dB 2 20V/us 2uV/℃ 35mA 500uV 50pA 5mA 5pA 8MHz 8nV/√Hz@1kHz Built-in compensation SOIC-8 Operational Amplifier ROHSTexas InstrumentsAudio AmplifiersTL072
SOP-8-18V~18V 0℃~+70℃ 1.4mA 1.5nA 10V/us 10mV 2 2.5nA 3MHz 85dB SOP-8 Operational Amplifier ROHSGcoreOperational Amplifier
NRJ6HF
Through hole- New Arrivals ROHSNeutrikUncategorised
README
README.mdAthena
2.1 audio crossover and headphone amplifier
This is a work-in-progress on a simple 2.1 audio crossover using active 2nd-order RC filters, as well as a headphone amplifier based on the popular CMoy design. The PCBs have not yet been ordered and confirmed.
Crossover frequency
The crossover frequency is set by the resistors R11-R16 and the capacitors C5-C10. Keep the values for all components the same.
Using a fixed, commonly available 100nF capacitor the following (and more) corner frequencies can be set:
| Resistance | Frequency |
|---|---|
| 22 kOhms | 72,34 Hz |
| 20 kOhms | 79,57 Hz |
| 18 kOhms | 88,42 Hz |
| 16 kOhms | 99,47 Hz |
| 15 kOhms | 106,10 Hz |
| 13 kOhms | 122,48 Hz |
| 12 kOhms | 132,64 Hz |
Power supply
The unit should be powered by at least 12 volts DC, but no more than 30 volts DC. More voltage will give you higher headroom for greater amplification (headphone) and high-level signal handling, though you should be able to use a regular 12 volts DC power supply for consumer line levels.
Attention: The power supply must never be connected to signal ground because this schematic referencing ground to VCC/2, i.e. the power supply ground is actually the negative voltage rail. Using a wall wart power supply you should not run into any issues. This avoids adding large capacitors in series on the outputs.
Enclosure
Use Fischer Elektronik KOH-1100 and KOH-2100 case components with lasercut panels from 2mm plexiglas for the enclosure. CAD files for panel cutouts are included.
Parts
136| Qty | Value | Footprint | References |
|---|---|---|---|
| 71 | VIA | via:VIA-0.6 | V1, V2, V10, V11, V12, V13, V14, V15, V16, V17, V18, V19, V20, V21, V22, V23 +55 |
| 16 | 100n | Capacitors_SMD:C_0805_HandSoldering | C1, C2, C4, C5, C6, C7, C8, C9, C10, C12, C13, C14, C15, C16, C17, C18 |
| 6 | 100k | Resistors_SMD:R_0603_HandSoldering | R1, R2, R17, R18, R19, R20 |
| 6 | 10k | Resistors_SMD:R_0603_HandSoldering | R3, R4, R9, R10, R21, R22 |
| 6 | 22k | Resistors_SMD:R_0603_HandSoldering | R11, R12, R13, R14, R15, R16 |
| 4 | LUM 1503-09 | Lumberg:LUM1503-09 | J1, J2, J3, J9 |
| 4 | NE5532 | Housings_SOIC:SOIC-8_3.9x4.9mm_Pitch1.27mm | U1, U4, U5, U6 |
| 4 | NRJ6HF | NRJ6HF:NRJ6HF | J4, J6, J7, J8 |
| 2 | 10u/16v | Capacitors_SMD:CP_Elec_4x5.3 | C3, C11 |
| 2 | 2k7 | Resistors_SMD:R_0603_HandSoldering | R5, R6 |
| 2 | 330R | Resistors_SMD:R_0603_HandSoldering | R23, R24 |
| 2 | 8k2 | Resistors_SMD:R_0603_HandSoldering | R7, R8 |
| 1 | 10k log | Potentiometers:Potentiometer_Trimmer_ACP_CA6v_Horizontal | RV2 |
| 1 | 10k log | Potentiometers:Potentiometer_Alps_RK09L_Double_Vertical | RV1 |
| 1 | 1n4001 | Diodes_THT:D_DO-41_SOD81_P7.62mm_Horizontal | D1 |
| 1 | DC BU21 90 | Connectors:BARREL_JACK | J5 |
| 1 | LED | LEDs:LED_D3.0mm_Horizontal_O3.81mm_Z6.0mm | D2 |
| 1 | LED | LEDs:LED_D3.0mm_Horizontal_O1.27mm_Z2.0mm | D3 |
| 1 | MS 500FVT | MS-500:MS500FVT | SW1 |
| 1 | OPA2134 | Housings_SOIC:SOIC-8_3.9x4.9mm_Pitch1.27mm | U3 |
| 1 | TL072 | Housings_SOIC:SOIC-8_3.9x4.9mm_Pitch1.27mm | U2 |
The 134 most common of 136 parts.
Questions
How big is the Athena PCB?
It measures 100 × 100 mm and has 2 copper layers, 1.6 mm thick.
What parts does the Athena use?
136 parts, built around the NE5532, OPA2134UA, TL072 and NRJ6HF. 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 Athena KiCad files?
From the JanKoppe/athena repository on GitHub, at the commit this page was made from: the board is Athena.kicad_pcb. PCBKit opens the board in the browser, with nothing to install.
Can I use the Athena design in my own project?
Its repository states no licence, so its author keeps all rights: ask JanKoppe before reusing the design.
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