2 layers178 × 145 mm
Ultra DB X51 v1
ExploreEmbedded/8051_DevelopmentBoard
Design files and sample code for 8051 development Ultra Boards
145 parts70
2 layers48 × 175 mm
DMH Transistor VCA PCB
DeMarco/DMH-Transistor-VCA1Classic transistor based VCA module design
- Size
- 48 × 175 mm
- Copper layers
- 2
- Thickness
- 1.6 mm
- Parts
- 70
- Nets
- 57
- Pads
- 210
- Tracks, vias
- 456, 0
- Pours
- 1
- Routed
- Yes
- KiCad
- KiCad 9.0 (file 20241229)
- Created
- 30 Nov 2024
- Updated
- 16 Jun 2025
Overview
DMH Transistor VCA PCB is an open-source printed circuit board by DeMarco, from the DeMarco/DMH-Transistor-VCA repository on GitHub, published under the CC0-1.0 licence. It is a 2-layer board of 48 × 175 mm with 70 parts on 57 nets, routed with 456 tracks and 0 vias.
It is built around the BC548. Its parts include 36 resistors, 12 connectors, 8 capacitors, 4 transistors and 2 ICs.
Main components
1README
README.mdDMH-Transistor-VCA
Classic transistor based VCA module design
Parts
70| Qty | Value | Footprint | References |
|---|---|---|---|
| 16 | 100k | Resistor_THT:R_Axial_DIN0207_L6.3mm_D2.5mm_P7.62mm_Horizontal | R3, R6, R7, R8, R11, R12, R18, R19, R25, R28, R31, R33, R34, R38, R41, R42 |
| 8 | TS_Jack_6.35mm_Sw | SynthStuff:CUI_MJ-63052A | J1, J2, J3, J4, J5, J6, J7, J8 |
| 6 | 100nF | Capacitor_THT:C_Disc_D4.3mm_W1.9mm_P5.00mm | C3, C4, C5, C6, C7, C8 |
| 6 | 10k | Resistor_THT:R_Axial_DIN0207_L6.3mm_D2.5mm_P7.62mm_Horizontal | R9, R16, R17, R26, R30, R39 |
| 4 | 100R | Resistor_THT:R_Axial_DIN0207_L6.3mm_D2.5mm_P7.62mm_Horizontal | R10, R13, R35, R36 |
| 4 | 20k | Resistor_THT:R_Axial_DIN0207_L6.3mm_D2.5mm_P7.62mm_Horizontal | R14, R15, R22, R23 |
| 4 | 33k | Resistor_THT:R_Axial_DIN0207_L6.3mm_D2.5mm_P7.62mm_Horizontal | R1, R4, R24, R32 |
| 4 | 50k | Potentiometer_THT:Potentiometer_Bourns_3296W_Vertical | RV9, RV10, RV11, RV12 |
| 4 | BC548 | Package_TO_SOT_THT:TO-92L_Inline_Wide | Q1, Q2, Q3, Q4 |
| 2 | 100k | Potentiometer_THT:Potentiometer_Bourns_3296W_Vertical | RV7, RV8 |
| 2 | 1k | Resistor_THT:R_Axial_DIN0207_L6.3mm_D2.5mm_P7.62mm_Horizontal | R20, R29 |
| 2 | 47uF | Capacitor_THT:CP_Radial_D5.0mm_P2.00mm | C1, C2 |
| 2 | Conn_01x08 | Connector_PinSocket_2.54mm:PinSocket_1x08_P2.54mm_Vertical | J50, J60 |
| 2 | TL074 | Package_DIP:DIP-14_W7.62mm_Socket | U1, U2 |
| 1 | IDC_02x05 | SynthStuff:IDC-Header_2x05_P2.54mm_Vertical_BackBone | J200 |
| 1 | IDC_02x05 | SynthStuff:IDC-Header_2x05_P2.54mm_Vertical_Eurorack | J100 |
| 1 | SB140+ | Diode_THT:D_DO-41_SOD81_P10.16mm_Horizontal | D1 |
| 1 | SB140- | Diode_THT:D_DO-41_SOD81_P10.16mm_Horizontal | D2 |
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Questions
How big is the DMH Transistor VCA PCB PCB?
It measures 48 × 175 mm and has 2 copper layers, 1.6 mm thick.
What parts does the DMH Transistor VCA PCB use?
70 parts, built around the BC548. 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 DMH Transistor VCA PCB KiCad files?
From the DeMarco/DMH-Transistor-VCA repository on GitHub, at the commit this page was made from: the board is DMH_Transistor_VCA_PCB/DMH_Transistor_VCA_PCB.kicad_pcb and its schematic DMH_Transistor_VCA_PANEL/DMH_Transistor_VCA_PANEL.kicad_sch. PCBKit opens the board in the browser, with nothing to install.
Can I use the DMH Transistor VCA PCB design in my own project?
Its repository publishes it under the CC0-1.0 licence: you may reuse it on that licence's terms (keep the author's notice, and for a copyleft licence share your changes alike).