2 layers78 × 57 mm
2 layers197 × 159 mm
Electronic trombone
dingjamesj/electronic-trombone- Size
- 197 × 159 mm
- Copper layers
- 2
- Thickness
- 1.6 mm
- Parts
- 235
- Nets
- 131
- Pads
- 593
- Tracks, vias
- 872, 49
- Pours
- 5
- Routed
- Yes
- KiCad
- KiCad 10.0 (file 20260206)
- Created
- 30 Dec 2024
- Updated
- 3 Sep 2026
Overview
Electronic trombone is an open-source printed circuit board by dingjamesj, from the dingjamesj/electronic-trombone repository on GitHub. It is a 2-layer board of 197 × 159 mm with 235 parts on 131 nets, routed with 872 tracks and 49 vias.
It is built around the CD74HC4051E, L7805 and L7905. Its parts include 51 resistors, 29 capacitors, 27 diodes, 16 connectors and 11 ICs.
Main components
3
CD74HC4051E
PDIP-16-55℃~+125℃ 1 2V~6V 45ns 45ns 4ns 70Ω 8:1 PDIP-16 Analog Switches, Multiplexers ROHSTexas InstrumentsAnalog Switches, Multiplexers
L7805
TO-220ST0℃~+125℃@(Tj) 1 1.2A 20V 2V@(1A) 42uV 500uA 5V 73dB@(120Hz) Fixed Positive Short Circuit Protection TO-220ST Voltage Regulators - Linear, Low Drop Out (LDO) Regulators ROHSOSENVoltage Regulators - Linear, Low Drop Out (LDO) RegulatorsL7905
TO-220TO-220 Voltage Regulators - Linear, Low Drop Out (LDO) Regulators ROHSKTPUncategorised
Parts
235| Qty | Value | Footprint | References |
|---|---|---|---|
| 29 | TestPoint_Small | TestPoint:TestPoint_Keystone_5000-5004_Miniature | TP1, TP2, TP10, TP11, TP12, TP13, TP14, TP15, TP16, TP17, TP18, TP19, TP20, TP21, TP22, TP23 +13 |
| 17 | 0.1u | Capacitor_SMD:C_0805_2012Metric | C4, C6, C7, C12, C14, C15, C21, C22, C23, C24, C25, C26, C27, C28, C29, C30 +1 |
| 16 | MountingHole | MountingHole:MountingHole_3.2mm_M3 | H5, H6, H7, H8, H9, H10, H11, H12, H13, H14, H15, H16, H17, H18, H19, H20 |
| 15 | 1N4148 | Diode_THT:D_DO-35_SOD27_P7.62mm_Horizontal | D1, D2, D5, D6, D7, D8, D13, D14, D15, D16, D17, D18, D19, D20, D21 |
| 12 | 100k | Potentiometer_THT:Potentiometer_Bourns_3339P_Vertical_HandSoldering | RV1, RV5, RV6, RV25, RV26, RV27, RV28, RV29, RV30, RV31, RV32, RV33 |
| 12 | 10k | Resistor_SMD:R_0805_2012Metric | R11, R12, R13, R14, R15, R16, R17, R24, R43, R44, R45, R46 |
| 12 | 1k | Resistor_SMD:R_0805_2012Metric | R9, R10, R19, R20, R31, R32, R36, R41, R42, R47, R48, R51 |
| 12 | LED | LED_THT:LED_D5.0mm | D3, D4, D9, D10, D11, D12, D22, D23, D24, D25, D26, D27 |
| 12 | Screw_Terminal_01x03 | Header 691137710003:691137710003 | J2, J3, J4, J5, J6, J7, J8, J9, J10, J11, J12, J15 |
| 10 | 100k | Resistor_SMD:R_0805_2012Metric | R1, R4, R5, R8, R23, R25, R30, R33, R34, R35 |
| 7 | 100k | Potentiometer_THT:Potentiometer_Bourns_3339P_Vertical | RV10, RV15, RV16, RV17, RV18, RV23, RV24 |
| 7 | TL074 | Package_DIP:DIP-14_W7.62mm | U2, U3, U4, U5, U6, U7, U9 |
| 6 | 10k | Resistor_THT:R_Radial_Power_L12.0mm_W8.0mm_P5.00mm | TH1, TH2, TH3, TH4, TH5, TH6 |
| 6 | 1u | Capacitor_THT:C_Rect_L7.2mm_W4.5mm_P5.00mm | C2, C13, C16, C17, C19, C20 |
| 6 | 200k | Potentiometer_THT:Potentiometer_Bourns_3339P_Vertical | RV11, RV12, RV13, RV14, RV20, RV22 |
| 4 | 100k | Potentiometer_THT:Potentiometer_Bourns_PTV09A-2_Single_Horizontal | RV2, RV4, RV7, RV9 |
| 4 | 1M | Resistor_SMD:R_0805_2012Metric | R2, R3, R6, R7 |
| 4 | LOGO | LOGO | G***, G***, G***, G*** |
| 4 | MountingHole_3.2mm_M3 | MountingHole:MountingHole_3.2mm_M3 | H1, H2, H3, H4 |
| 4 | NPN | Package_TO_SOT_THT:TO-92 | Q1, Q3, Q5, Q6 |
| 3 | 10k | Resistor_THT:R_Axial_DIN0207_L6.3mm_D2.5mm_P7.62mm_Horizontal | R21, R28, R29 |
| 3 | 1n | Capacitor_THT:C_Rect_L18.0mm_W5.0mm_P15.00mm_FKS3_FKP3 | C9, C10, C11 |
| 3 | 51k | Resistor_SMD:R_0805_2012Metric | R37, R39, R40 |
| 3 | Screw_Terminal_01x02 | Header 691137710002:691137710002 | J1, J13, J16 |
| 2 | 2.2n | Capacitor_THT:C_Rect_L18.0mm_W7.0mm_P15.00mm_FKS3_FKP3 | C1, C3 |
| 2 | 2.7k | Resistor_THT:R_Axial_DIN0207_L6.3mm_D2.5mm_P7.62mm_Horizontal | R26, R27 |
| 2 | 5k | Potentiometer_THT:Potentiometer_Bourns_3339P_Vertical_HandSoldering | RV3, RV8 |
| 2 | 820 | Resistor_SMD:R_0805_2012Metric | R49, R50 |
| 2 | BC9VPC | Battery Holder BC9VPC:BC9VPC_MPD | B1, B2 |
| 2 | PNP | Package_TO_SOT_THT:TO-92 | Q2, Q4 |
| 1 | 10k | Potentiometer_THT:Potentiometer_Bourns_3339P_Vertical | RV19 |
| 1 | 10n | Capacitor_SMD:C_0805_2012Metric | C18 |
| 1 | 1k | Resistor_THT:R_Axial_DIN0207_L6.3mm_D2.5mm_P7.62mm_Horizontal | R22 |
| 1 | 2.2k | Resistor_SMD:R_0805_2012Metric | R18 |
| 1 | 22k | Resistor_SMD:R_0805_2012Metric | R38 |
| 1 | 40106 | Package_DIP:DIP-14_W7.62mm | U1 |
| 1 | 50k | Potentiometer_THT:Potentiometer_Bourns_3339P_Vertical | RV21 |
| 1 | CD74HC4051E | Package_DIP:DIP-16_W7.62mm | U8 |
| 1 | Conn_01x03 | Connector_JST:JST_XH_S3B-XH-A_1x03_P2.50mm_Horizontal | J14 |
| 1 | L7805 | Package_TO_SOT_THT:TO-220-3_Vertical | U10 |
| 1 | L7905 | Package_TO_SOT_THT:TO-220-3_Vertical | U11 |
| 1 | SW_DPST | Library:DPST Switch RA83231100 | SW1 |
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Questions
How big is the Electronic trombone PCB?
It measures 197 × 159 mm and has 2 copper layers, 1.6 mm thick.
What parts does the Electronic trombone use?
235 parts, built around the CD74HC4051E, L7805 and L7905. 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 Electronic trombone KiCad files?
From the dingjamesj/electronic-trombone repository on GitHub, at the commit this page was made from: the board is KiCad/Main/Main.kicad_pcb and its schematic KiCad/Amplifier/Amplifier.kicad_sch. PCBKit opens the board in the browser, with nothing to install.
Can I use the Electronic trombone design in my own project?
Its repository states no licence, so its author keeps all rights: ask dingjamesj before reusing the design.