2 layers20 × 106.7 mm
2 layers90 × 80 mm
Bass
kaileh57/BassAn electric bass
- Size
- 90 × 80 mm
- Copper layers
- 2
- Thickness
- 1.6 mm
- Parts
- 66
- Nets
- 37
- Pads
- 143
- Tracks, vias
- 215, 16
- Pours
- 1
- Routed
- Yes
- KiCad
- KiCad 9.0 (file 20241229)
- Created
- 22 Feb 2026
- Updated
- 4 Apr 2026
Overview
Bass is an open-source printed circuit board by kaileh57, from the kaileh57/Bass repository on GitHub. It is a 2-layer board of 90 × 80 mm with 66 parts on 37 nets, routed with 215 tracks and 16 vias.
It is built around the NJM4556AD, OPA2134PA and TLE2426CLPR. Its parts include 3 resistors, 3 ICs, 1 capacitor, 1 diode and 1 inductor.
Main components
3
NJM4556AD
DIP-8-18V~-2V、2V~18V -40℃~+85℃ 2 3V/us 500uV 50nA 5nA 70mA 8MHz 90dB 9mA DIP-8 Operational Amplifier ROHSJRCOperational AmplifierOPA2134PA
PDIP-8-18V~-2.5V、2.5V~18V -40℃~+85℃ 0.00008% 106dB 2-Channel 5mA PDIP-8 Audio Amplifiers ROHSTexas InstrumentsAudio Amplifiers
TLE2426CLPR
TO-92-30℃~+70℃@(Ta) 20mA 25ppm/℃ 2V~20V 30uVrms、120uVrms 400uA 4V~40V Adjustable Ground (Virtual) ±1% TO-92-3 Voltage Reference ROHSTexas InstrumentsVoltage Reference
README
README.mdThis is a precision fender-style electric bass designed by me!
It's got three knobs for volume, treble and bass, as well as a custom PCB for active sound managment, and a dual amp system to play audio to EITHER a 1/4" jack OR a standard 3.5mm headphone jack. It also has a small rechargable battery to let me play with my headphones away from an amp or power source for hopefully a few hours at a time.
The bass is pretty standard, and if you wanna 3d print the two parts, buy all the components, the wiring diagram should get you through the complex part!
I made this as I don't currently have an electric bass to play on, and would really like the chance to make my own instrument and start playing new types of music!
Here's what it looks like assembled:
The PCB
Wiring diagram:
The bom can be found in the bom.csv!
This was made (JUST IN TIME) for hack clubs blueprint program, which has been awesome!
Parts
66| Qty | Value | Footprint | References |
|---|---|---|---|
| 6 | 10K | Resistor_THT:R_Axial_DIN0207_L6.3mm_D2.5mm_P10.16mm_Horizontal | R_fb1, R_fb2, R_flat_fb1, R_flat_in1, R_treble1, R_treble2 |
| 4 | 100nF | Capacitor_THT:C_Disc_D5.0mm_W2.5mm_P5.00mm | C_byp_U1, C_vref_U1, C2, C4 |
| 4 | 10k | Resistor_THT:R_Axial_DIN0207_L6.3mm_D2.5mm_P10.16mm_Horizontal | R_bleed1, R_bleed2, R_gain1, R_gain2 |
| 4 | MountingHole_M3 | MountingHole:MountingHole_3.2mm_M3_Pad | H1, H2, H3, H4 |
| 3 | 100uF 25V | Capacitor_THT:CP_Radial_D8.0mm_P3.50mm | C_pwr_U1, C_pwr_U2, C1 |
| 3 | 1uF | Capacitor_THT:C_Rect_L7.2mm_W2.5mm_P5.00mm_FKS2_FKP2_MKS2_MKP2 | C_hp_in1, C_hp_in2, C_in1 |
| 3 | 22K | Resistor_THT:R_Axial_DIN0207_L6.3mm_D2.5mm_P10.16mm_Horizontal | R_bass1, R_bass2, R_treble3 |
| 2 | 0R | Resistor_THT:R_Axial_DIN0207_L6.3mm_D2.5mm_P10.16mm_Horizontal | R_damp1, R_in_prot1 |
| 2 | 100R | Resistor_THT:R_Axial_DIN0207_L6.3mm_D2.5mm_P10.16mm_Horizontal | R_bias1, R2 |
| 2 | 100nf | Capacitor_THT:C_Disc_D5.0mm_W2.5mm_P5.00mm | C_byp_U2, C_vref_U2 |
| 2 | 10R | Resistor_THT:R_Axial_DIN0207_L6.3mm_D2.5mm_P10.16mm_Horizontal | R8, R11 |
| 2 | 470K | Resistor_THT:R_Axial_DIN0207_L6.3mm_D2.5mm_P10.16mm_Horizontal | R_bias_hp1, R_bias_hp2 |
| 2 | 470uF 10V | Capacitor_THT:CP_Radial_D10.0mm_P5.00mm | C_hp_out1, C_hp_out2 |
| 1 | +9V | TestPoint:TestPoint_Pad_2.0x2.0mm | TP1 |
| 1 | 1000uF 10V | Capacitor_THT:CP_Radial_D12.5mm_P5.00mm | C3 |
| 1 | 100uH | Inductor_THT:L_Radial_D10.0mm_P5.00mm_Fastron_07M | L1 |
| 1 | 1M | Resistor_THT:R_Axial_DIN0207_L6.3mm_D2.5mm_P10.16mm_Horizontal | R1 |
| 1 | 1N5819 | Diode_THT:D_DO-41_SOD81_P10.16mm_Horizontal | D1 |
| 1 | 1nF | Capacitor_THT:C_Rect_L7.2mm_W2.5mm_P5.00mm_FKS2_FKP2_MKS2_MKP2 | C_treble1 |
| 1 | 1nf | Capacitor_THT:C_Disc_D5.0mm_W2.5mm_P5.00mm | C_bias1 |
| 1 | 2.2K | Resistor_THT:R_Axial_DIN0207_L6.3mm_D2.5mm_P10.16mm_Horizontal | R_LED1 |
| 1 | 2.2R | Resistor_THT:R_Axial_DIN0207_L6.3mm_D2.5mm_P10.16mm_Horizontal | R_stab1 |
| 1 | 2.2uF | Capacitor_THT:C_Rect_L13.5mm_W5.0mm_P10.00mm_FKS3_FKP3_MKS4 | C_vol1 |
| 1 | BASS_POT | Connector_PinHeader_2.54mm:PinHeader_1x03_P2.54mm_Vertical | J_BASS_POT1 |
| 1 | Conn_01x02 | Connector_PinHeader_2.54mm:PinHeader_1x02_P2.54mm_Vertical | PWR_IN1 |
| 1 | GND | TestPoint:TestPoint_Pad_2.0x2.0mm | TP2 |
| 1 | HP_OUT | Connector_PinHeader_2.54mm:PinHeader_1x03_P2.54mm_Vertical | J_HP_OUT1 |
| 1 | LED | Connector_PinHeader_2.54mm:PinHeader_1x02_P2.54mm_Vertical | J_LED1 |
| 1 | LINE_OUT | Connector_PinHeader_2.54mm:PinHeader_1x02_P2.54mm_Vertical | J_LINE_OUT1 |
| 1 | NJM4556AD | Package_DIP:DIP-8_W7.62mm | U2 |
| 1 | NODE_A | TestPoint:TestPoint_Pad_2.0x2.0mm | TP4 |
| 1 | NODE_B | TestPoint:TestPoint_Pad_2.0x2.0mm | TP5 |
| 1 | NODE_C | TestPoint:TestPoint_Pad_2.0x2.0mm | TP6 |
| 1 | OPA2134PA | Package_DIP:DIP-8_W7.62mm | U1 |
| 1 | PICKUP | Connector_PinHeader_2.54mm:PinHeader_1x02_P2.54mm_Vertical | J_PICKUP1 |
| 1 | SWITCH | Connector_PinHeader_2.54mm:PinHeader_1x06_P2.54mm_Vertical | J_SWITCH1 |
| 1 | TLE2426CLP | Package_TO_SOT_THT:TO-92_Inline | U3 |
| 1 | TREB_POT | Connector_PinHeader_2.54mm:PinHeader_1x03_P2.54mm_Vertical | J_TREB_POT1 |
| 1 | VOL_POT | Connector_PinHeader_2.54mm:PinHeader_1x03_P2.54mm_Vertical | J_VOL_POT1 |
| 1 | VREF | TestPoint:TestPoint_Pad_2.0x2.0mm | TP3 |
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Questions
How big is the Bass PCB?
It measures 90 × 80 mm and has 2 copper layers, 1.6 mm thick.
What parts does the Bass use?
66 parts, built around the NJM4556AD, OPA2134PA and TLE2426CLPR. 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 Bass KiCad files?
From the kaileh57/Bass repository on GitHub, at the commit this page was made from: the board is PCB/bass.kicad_pcb and its schematic PCB/bass.kicad_sch. PCBKit opens the board in the browser, with nothing to install.
Can I use the Bass design in my own project?
Its repository states no licence, so its author keeps all rights: ask kaileh57 before reusing the design.