DMH Dual VCA Mk3 PCB 1
About the DMH Dual VCA Mk3 PCB 1
DMH Dual VCA Mk3 PCB 1 is an open source PCB design by DeMarco, published on GitHub under the CC0-1.0 license. It is a 2-layer board measuring 48 × 175 mm, with 78 components from 34 distinct parts.
Other key parts include the LM4040LP-5 and TL074. By type, the board carries 42 resistors, 13 connectors, 8 capacitors, 4 transistors, 3 ICs and 2 diodes.
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 1
DMH Dual VCA Mk3 PCB 1 bill of materials (BOM)
78 components, 34 distinct parts — part numbers from the project's BOM.
| Qty | Part | Footprint | Refs |
|---|---|---|---|
| 2 | LM4040LP-5 TL074 | DIP-14_W7.62mm_Socket | U1, U2 |
| 1 | TL074 TL072 | DIP-8_W7.62mm_Socket | U3 |
| 4 | BC548 | TO-92L_Inline_Wide | Q1, Q2, Q3, Q4 |
| 9 | TRS_JACK_6.35MM_SW TS_Jack_6.35mm_Sw | CUI_MJ-63052A | J1, J2, J3, J4, J5, J6, J7, J8 +1 |
| 2 | Conn_01x08 | PinSocket_1x08_P2.54mm_Vertical | J50, J60 |
| 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 |
| 2 | 100K 100k | Potentiometer_Bourns_3296W_Vertical | RV7, RV8 |
| 2 | 50K 50k | Potentiometer_Bourns_3296W_Vertical | RV9, RV10 |
| 2 | 100K 50k | Potentiometer_Bourns_3296W_Vertical | RV11, RV12 |
| 1 | 1N4148 SB140+ | D_DO-41_SOD81_P10.16mm_Horizontal | D1 |
| 1 | 1N4148 SB140- | D_DO-41_SOD81_P10.16mm_Horizontal | D2 |
| 2 | 100NF 47uF | CP_Radial_D5.0mm_P2.00mm | C1, C2 |
| 1 | 22PF 100nF | C_Disc_D4.3mm_W1.9mm_P5.00mm | C3 |
| 2 | 47UF 100nF | C_Disc_D4.3mm_W1.9mm_P5.00mm | C4, C5 |
| 3 | 100NF 100nF | C_Disc_D4.3mm_W1.9mm_P5.00mm | C6, C7, C8 |
| 1 | 3K3 33k | R_Axial_DIN0207_L6.3mm_D2.5mm_P7.62mm_Horizontal | R1 |
| 1 | 33K 100k | R_Axial_DIN0207_L6.3mm_D2.5mm_P7.62mm_Horizontal | R3 |
| 1 | 100K 33k | R_Axial_DIN0207_L6.3mm_D2.5mm_P7.62mm_Horizontal | R4 |
| 10 | 100K 100k | R_Axial_DIN0207_L6.3mm_D2.5mm_P7.62mm_Horizontal | R6, R7, R8, R12, R25, R28, R38, R41 +2 |
Show 14 more
| Qty | Part | Footprint | Refs |
|---|---|---|---|
| 1 | 20K 10k | R_Axial_DIN0207_L6.3mm_D2.5mm_P7.62mm_Horizontal | R9 |
| 3 | 10K 100R | R_Axial_DIN0207_L6.3mm_D2.5mm_P7.62mm_Horizontal | R10, R35, R36 |
| 4 | 20K 100k | R_Axial_DIN0207_L6.3mm_D2.5mm_P7.62mm_Horizontal | R11, R19, R31, R33 |
| 1 | 100K 100R | R_Axial_DIN0207_L6.3mm_D2.5mm_P7.62mm_Horizontal | R13 |
| 2 | 100K 20k | R_Axial_DIN0207_L6.3mm_D2.5mm_P7.62mm_Horizontal | R14, R15 |
| 4 | 100K 10k | R_Axial_DIN0207_L6.3mm_D2.5mm_P7.62mm_Horizontal | R16, R17, R26, R39 |
| 4 | 100R 100k | R_Axial_DIN0207_L6.3mm_D2.5mm_P7.62mm_Horizontal | R18, R34, R42, R46 |
| 1 | 10K 1k | R_Axial_DIN0207_L6.3mm_D2.5mm_P7.62mm_Horizontal | R20 |
| 1 | 100R 20k | R_Axial_DIN0207_L6.3mm_D2.5mm_P7.62mm_Horizontal | R22 |
| 1 | 10K 20k | R_Axial_DIN0207_L6.3mm_D2.5mm_P7.62mm_Horizontal | R23 |
| 2 | 10K 33k | R_Axial_DIN0207_L6.3mm_D2.5mm_P7.62mm_Horizontal | R24, R32 |
| 2 | 100K 1k | R_Axial_DIN0207_L6.3mm_D2.5mm_P7.62mm_Horizontal | R29, R51 |
| 1 | 100R 10k | R_Axial_DIN0207_L6.3mm_D2.5mm_P7.62mm_Horizontal | R30 |
| 2 | 10K 100k | R_Axial_DIN0207_L6.3mm_D2.5mm_P7.62mm_Horizontal | R47, R48 |
DMH Dual VCA Mk3 PCB 1 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 1: common questions
How big is the DMH Dual VCA Mk3 PCB 1?
The DMH Dual VCA Mk3 PCB 1 measures 48 × 175 mm, has 2 copper layers and is 1.6 mm thick.
How many components are on the DMH Dual VCA Mk3 PCB 1?
78 components, from 34 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 1 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 1 design in my own project?
Yes, under the terms of its CC0-1.0 license, which DeMarco chose for the repository.
