DMH Dual VCA Mk3 PCB Main
About the DMH Dual VCA Mk3 PCB Main
DMH Dual VCA Mk3 PCB Main is an open source PCB design by DeMarco, published on GitHub under the CC0-1.0 license. It is a 2-layer board measuring 49 × 175 mm, with 97 components from 30 distinct parts.
Other key parts include the LM4040LP-5, TL074 and TL072. By type, the board carries 41 resistors, 19 connectors, 15 capacitors, 8 diodes, 5 ICs and 4 transistors.
From the project
Version 3 of my stereo VCA in Kosmo format
- 2 channels, A and B - 2 CV inputs per channel, each one with its own attenuverter knob - Unipolar control voltage: 0V means VCA is fully closed (gain = 0), +10V means completely open (gain = 1) - 1 offset knob per channel, useful to bias bipolar CV signals like those from LFOs - The offset setting and attenuverted CV inputs of each channel are summed - Toggle switches to select between pan/balanced/tremolo mode, and clipping/distortion - Pan mode: output volue of both channels is halved. Pan CV signal will increase one channel's volume and decrease the other's simultaneously. - Balanced…
Main components on the DMH Dual VCA Mk3 PCB Main
DMH Dual VCA Mk3 PCB Main bill of materials (BOM)
97 components, 30 distinct parts — part numbers from the project's BOM.
| Qty | Part | Footprint | Refs |
|---|---|---|---|
| 2 | LM4040LP-5 | TO-92L_Inline_Wide | U1, U2 |
| 2 | TL074 | DIP-14_W7.62mm_Socket | U3, U10 |
| 1 | TL072 | DIP-8_W7.62mm_Socket | U4 |
| 4 | BC548 | TO-92L_Inline_Wide | Q9, Q10, Q11, Q12 |
| 9 | TRS_JACK_6.35MM_SW TRS_Jack_6.35mm_Sw | CUI_SJ-63083D | J1, J2, J3, J4, J5, J6, J7, J8 +1 |
| 2 | CONN_01X06 Conn_01x06 | PinHeader_1x06_P2.54mm_Vertical | J11, J13 |
| 2 | CONN_01X08 Conn_01x08 | PinHeader_1x08_P2.54mm_Vertical | J12, J21 |
| 4 | CONN_02X03_ODD_EVEN Conn_02x03_Odd_Even | PinSocket_2x03_P2.54mm_Vertical | J18, J19, J22, J23 |
| 1 | IDC_02X05 IDC_02x05 | IDC-Header_2x05_P2.54mm_Vertical_Eurorack | J100 |
| 1 | IDC_02X05 IDC_02x05 | IDC-Header_2x05_P2.54mm_Vertical_BackBone | J200 |
| 4 | Jumper | PinHeader_1x03_P2.54mm_Vertical | JP1, JP2, JP3, JP4 |
| 1 | 50K 50k | Potentiometer_Bourns_3296W_Vertical | RV1 |
| 2 | 1N4148 | D_DO-35_SOD27_P7.62mm_Horizontal | D1, D2 |
| 2 | SB140 | D_DO-41_SOD81_P10.16mm_Horizontal | D3, D4 |
| 4 | ZPD3V0 | D_DO-35_SOD27_P7.62mm_Horizontal | D11, D12, D13, D14 |
| 8 | 100NF 100nF | C_Disc_D4.3mm_W1.9mm_P5.00mm | C1, C2, C6, C7, C8, C9, C24, C25 |
| 1 | 22PF 22pF | C_Disc_D3.0mm_W2.0mm_P2.50mm | C3 |
| 2 | 47UF 47uF | CP_Radial_D5.0mm_P2.00mm | C4, C5 |
| 2 | 2.2UF 2.2uF | CP_Radial_D4.0mm_P1.50mm | C20, C21 |
| 2 | 22UF 22uF | CP_Radial_D4.0mm_P1.50mm | C22, C23 |
Show 10 more
| Qty | Part | Footprint | Refs |
|---|---|---|---|
| 2 | 3K3 3k3 | R_Axial_DIN0207_L6.3mm_D2.5mm_P7.62mm_Horizontal | R1, R2 |
| 1 | 33K 33k | R_Axial_DIN0207_L6.3mm_D2.5mm_P7.62mm_Horizontal | R3 |
| 19 | 100K 100k | R_Axial_DIN0207_L6.3mm_D2.5mm_P7.62mm_Horizontal | R4, R5, R6, R7, R8, R12, R13, R14 +11 |
| 2 | 20K 20k | R_Axial_DIN0207_L6.3mm_D2.5mm_P7.62mm_Horizontal | R9, R11 |
| 3 | 10K 10k | R_Axial_DIN0207_L6.3mm_D2.5mm_P7.62mm_Horizontal | R10, R76, R78 |
| 2 | 1K5 1k5 | R_Axial_DIN0207_L6.3mm_D2.5mm_P7.62mm_Horizontal | R77, R79 |
| 2 | 4K7 4k7 | R_Axial_DIN0207_L6.3mm_D2.5mm_P7.62mm_Horizontal | R85, R88 |
| 4 | 1k | R_Axial_DIN0207_L6.3mm_D2.5mm_P7.62mm_Horizontal | R86, R89, R100, R101 |
| 4 | 2K2 2k2 | R_Axial_DIN0207_L6.3mm_D2.5mm_P7.62mm_Horizontal | R90, R91, R98, R99 |
| 2 | 220K 220k | R_Axial_DIN0207_L6.3mm_D2.5mm_P7.62mm_Horizontal | R94, R95 |
DMH Dual VCA Mk3 PCB Main design files
The KiCad project lives in the DeMarco/DMH-Dual-VCA-Mk3 repository on GitHub; these links point at the commit this page was built from.
DMH Dual VCA Mk3 PCB Main: common questions
How big is the DMH Dual VCA Mk3 PCB Main?
The DMH Dual VCA Mk3 PCB Main measures 49 × 175 mm, has 2 copper layers and is 1.6 mm thick.
How many components are on the DMH Dual VCA Mk3 PCB Main?
97 components, from 30 distinct parts, with part numbers taken from the project's own BOM. The full bill of materials is listed on this page.
Where can I download the DMH Dual VCA Mk3 PCB Main design files?
From the DeMarco/DMH-Dual-VCA-Mk3 repository on GitHub, which has the KiCad layout, the schematic and the BOM; the links under Design files point to each one.
Can I use the DMH Dual VCA Mk3 PCB Main design in my own project?
Yes, under the terms of its CC0-1.0 license, which DeMarco chose for the repository.
