2 layers216.9 × 86.8 mm
Sweepbling lp pcb
davidphilipbarr/Sweep
Sweep - a small promicro based keyboard inspired by the Ferris.
59 parts2.1k
2 layers426 × 43.2 mm
1URack 8Input AB 2Output Mixer
cracked-machine/1URack_8Input_AB_2Output_Mixer10Eurorack-compatible 1U 8-channel mixer with selectable A/B outputs.
- Size
- 426 × 43.2 mm
- Copper layers
- 2
- Thickness
- 1.6 mm
- Parts
- 59
- Nets
- 52
- Pads
- 206
- Tracks, vias
- 321, 22
- Pours
- 1
- Routed
- Yes
- KiCad
- KiCad 5 (file 20171130)
- Created
- 5 May 2018
- Updated
- 18 Oct 2018
Overview
1URack 8Input AB 2Output Mixer is an open-source printed circuit board by cracked-machine, from the cracked-machine/1URack_8Input_AB_2Output_Mixer repository on GitHub. It is a 2-layer board of 426 × 43.2 mm with 59 parts on 52 nets, routed with 321 tracks and 22 vias.
It belongs with the audio and music boards of this library.
README
FrontPanel/README.md1URack_8Input_AB_2Output_Mixer
Eurorack-compatible 1U 8-channel mixer with selectable A/B outputs.
Assembly Instructions:
A. Resistors
- 8 x 2K2 on all R_LEDX positions (R_LED1 - R_LED8)
- 8 x 10K on all R_ChannelAB_OAin_RinX positions (R_ChannelAB_OAin_Rin1 - R_ChannelAB_OAin_Rin8)
- 2 x 10K on R_ChanA_OAin_RfX (R_ChanA_OAin_Rf1 and R_ChanA_OAin_Rf2)
- 2 x 22K on R_ChanB_OAout_RinX (R_ChanB_OAout_Rin1 and R_ChanB_OAout_Rin2)
- 2 x 1K on R_ChanB_OAoutX (R_ChanB_OAout1 and R_ChanB_OAout2)
B. Capacitors
- 2 x 100nF on C_ChanA_POSBYX (C_ChanA_POSBY1 and C_ChanA_POSBY2)
- 2 x 100nF on C_ChanA_NEGBYX (C_ChanA_NEGBY1 and C_ChanA_NEGBY2)
- 1 x 100nF on C_PW_BYNEG1
- 1 x 100nF on C_PW_BYPOS1
C. SOIC components
- 2 x TL072 on U_ChanA_OA1 and U_ChanB_OA1
D. ThroughHole Components
- Solder one fader per section (1-8, A and B). Will only fit one way
- Solder one Jack socket per section (1-8, A and B)
- solder one switch per input section (1-8). Orientation does not matter.
- Solder pin headers in the power supply holes (2x5).
Troubleshooting:
Visual Inspection: Most problems will arise from bad solder joints on the SMT components so be sure to make a final visual inspection when done. You might find it easier to do this after cleaning the flux off the pcb first.
Measure Voltages: Check for +/-12V voltages at the power supply pins. Also check pins 8 (positive) and 4 (negative) on the two SOIC TL072 OpAmps.
For each input channel: You wil be able to see the input signal if you probe the middle pin of the switch whilst in the off (center) position. The resistance across resistor (R_ChannelAB_OAin_RinX) will be 2K5 (A position), 10K (Center position) and 8K (B position).
For the output channels: On the SOIC TL072 OpAmps, probing pin 1 will show the input signals (NOT affected by output fader). Probing pin 6 will show the output signals (affected by output fader)
Parts
59| Qty | Value | Footprint | References |
|---|---|---|---|
| 10 | 10K | Resistors_SMD:R_0805_HandSoldering | R_ChanA_OAin_Rf1, R_ChanAB_OAin_Rin1, R_ChanAB_OAin_Rin2, R_ChanAB_OAin_Rin3, R_ChanAB_OAin_Rin4, R_ChanAB_OAin_Rin5, R_ChanAB_OAin_Rin6, R_ChanAB_OAin_Rin7, R_ChanAB_OAin_Rin8, R_ChanB_OAin_Rf1 |
| 10 | Audio-JackMono_Tip3_Sw2_Slv1 | ThonkiConn_3:Conn_3.5mmJackMono_Vertical_PJ301M-12 | J_ChanA_out1, J_ChanB_out1, J_IN1, J_IN2, J_IN3, J_IN4, J_IN5, J_IN6, J_IN7, J_IN8 |
| 8 | 2K2 | Resistors_SMD:R_0805_HandSoldering | R_LED1, R_LED2, R_LED3, R_LED4, R_LED5, R_LED6, R_LED7, R_LED8 |
| 8 | B50K | Bourn_PTL_Slider:Slider_PTL20_LED_35MM | VR_ChanA_OAout_Rf1, VR_ChanB_OAout_Rf1, VR_FADER1, VR_FADER3, VR_FADER5, VR_FADER6, VR_FADER7, VR_FADER8 |
| 8 | SW_SPDT | DailywellSwitches:Dailywell_SPDT | SW_AB1, SW_AB2, SW_AB3, SW_AB4, SW_AB5, SW_AB6, SW_AB7, SW_AB8 |
| 6 | 100nF | Capacitors_SMD:C_0805_HandSoldering | C_ChanA_NEGBY1, C_ChanA_POSBY1, C_ChanB_BYNEG1, C_ChanB_BYPOS1, C_PW_BYNEG1, C_PW_BYPOS1 |
| 2 | 1K | Resistors_SMD:R_0805_HandSoldering | R_ChanA_OAout1, R_ChanB_OAout1 |
| 2 | 22K | Resistors_SMD:R_0805_HandSoldering | R_ChanA_OAout_Rin1, R_ChanB_OAout_Rin1 |
| 2 | B5K | Bourn_PTL_Slider:Slider_PTL20_LED_35MM | VR_FADER2, VR_FADER4 |
| 2 | TL072_InversedInputs | SMD_Packages:SOIC-8-N | U_ChanA_OA1, U_ChanB_OA1 |
| 1 | EurorackPowerConnector_2x5Pin | Pin_Headers:Pin_Header_Straight_2x05_Pitch2.54mm | J_PWR1 |
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Questions
How big is the 1URack 8Input AB 2Output Mixer PCB?
It measures 426 × 43.2 mm and has 2 copper layers, 1.6 mm thick.
What parts does the 1URack 8Input AB 2Output Mixer use?
59 parts. 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 1URack 8Input AB 2Output Mixer KiCad files?
From the cracked-machine/1URack_8Input_AB_2Output_Mixer repository on GitHub, at the commit this page was made from: the board is Hardware/1URack_8Input_AB_2Output_Mixer.kicad_pcb. PCBKit opens the board in the browser, with nothing to install.
Can I use the 1URack 8Input AB 2Output Mixer design in my own project?
Its repository states no licence, so its author keeps all rights: ask cracked-machine before reusing the design.