DMH Dual VCA Mk3 PCB 2
About the DMH Dual VCA Mk3 PCB 2
DMH Dual VCA Mk3 PCB 2 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 × 121 mm, with 114 components from 64 distinct parts.
Other key parts include the TL074 and TL072. By type, the board carries 65 resistors, 14 diodes, 11 capacitors, 4 ICs, 4 transistors and 4 connectors.
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 2
DMH Dual VCA Mk3 PCB 2 bill of materials (BOM)
114 components, 64 distinct parts — part numbers from the project's BOM.
| Qty | Part | Footprint | Refs |
|---|---|---|---|
| 1 | TL074 | DIP-14_W7.62mm_Socket | U3 |
| 3 | TL072 TL074 | DIP-14_W7.62mm_Socket | U4, U7, U8 |
| 4 | BC548 | TO-92L_Inline_Wide | Q5, Q6, Q7, Q8 |
| 1 | Conn_01x04 | PinSocket_1x04_P2.54mm_Vertical | J10 |
| 1 | CONN_01X06 Conn_01x04_PinHeader | PinSocket_1x04_P2.54mm_Vertical | J11 |
| 2 | Conn_01x08 | PinSocket_1x08_P2.54mm_Vertical | J50, J60 |
| 1 | 50K 100k | Potentiometer_Alpha_RD901F-40-00D_Single_Vertical | RV1 |
| 3 | 100K 100k | Potentiometer_TT_P110KH1 | RV2, RV3, RV5 |
| 1 | 100K 100k | Potentiometer_Alpha_RD901F-40-00D_Single_Vertical | RV4 |
| 1 | 50K 100k | Potentiometer_TT_P110KH1 | RV6 |
| 1 | 100K 50k | Potentiometer_Alps_RK09L_Double_Vertical | RV13 |
| 2 | 50K 100k | Potentiometer_Bourns_3296W_Vertical | RV14, RV15 |
| 1 | 100K 50k | Potentiometer_Bourns_3296W_Vertical | RV16 |
| 1 | SW_DPDT_3WAY SW_DPDT_OnOffOn_x2 | Toggle_Switch_2_Poles_TE | SW1 |
| 1 | SW_DPDT_ONOFFON_X2 SW_DPDT_3way | Toggle_Switch_2_Poles_TE | SW2 |
| 2 | SB140 1N4148 | D_DO-35_SOD27_P7.62mm_Horizontal | D3, D4 |
| 2 | ZPD4V7 | D_DO-35_SOD27_P7.62mm_Horizontal | D5, D6 |
| 2 | ZPD4V7 | D_DO-35_SOD27_P7.62mm_Horizontal | D7, D8 |
| 2 | ZPD4V7 ZPD3V0 | D_DO-35_SOD27_P7.62mm_Horizontal | D9, D10 |
| 2 | ZPD3V0 | D_DO-35_SOD27_P7.62mm_Horizontal | D11, D12 |
Show 44 more
| Qty | Part | Footprint | Refs |
|---|---|---|---|
| 1 | ZPD3V0 LED_R | LED_D3.0mm | D13 |
| 1 | ZPD3V0 1N4148 | D_DO-35_SOD27_P7.62mm_Horizontal | D14 |
| 1 | 1N4148 | D_DO-35_SOD27_P7.62mm_Horizontal | D15 |
| 1 | LED_R | LED_D3.0mm | D16 |
| 8 | 100NF 100nF | C_Disc_D4.3mm_W1.9mm_P5.00mm | C7, C8, C12, C13, C14, C15, C16, C17 |
| 1 | 100NF 22pF | C_Disc_D3.0mm_W2.0mm_P2.50mm | C11 |
| 2 | 100NF 2.2uF | CP_Radial_D4.0mm_P1.50mm | C18, C19 |
| 16 | 100K 100k | R_Axial_DIN0207_L6.3mm_D2.5mm_P7.62mm_Horizontal | R5, R27, R29, R37, R50, R51, R52, R53 +8 |
| 1 | 10K 2k2 | R_Axial_DIN0207_L6.3mm_D2.5mm_P7.62mm_Horizontal | R20 |
| 1 | 20K 18k | R_Axial_DIN0207_L6.3mm_D2.5mm_P7.62mm_Horizontal | R21 |
| 1 | 100K 18k | R_Axial_DIN0207_L6.3mm_D2.5mm_P7.62mm_Horizontal | R40 |
| 2 | 20K 100R | R_Axial_DIN0207_L6.3mm_D2.5mm_P7.62mm_Horizontal | R43, R57 |
| 3 | 10K 20k | R_Axial_DIN0207_L6.3mm_D2.5mm_P7.62mm_Horizontal | R44, R60, R78 |
| 1 | 20K 10k | R_Axial_DIN0207_L6.3mm_D2.5mm_P7.62mm_Horizontal | R45 |
| 2 | 100R 20k | R_Axial_DIN0207_L6.3mm_D2.5mm_P7.62mm_Horizontal | R46, R58 |
| 1 | 10K 100R | R_Axial_DIN0207_L6.3mm_D2.5mm_P7.62mm_Horizontal | R47 |
| 2 | 10K 10k | R_Axial_DIN0207_L6.3mm_D2.5mm_P7.62mm_Horizontal | R48, R59 |
| 3 | 100K 10k | R_Axial_DIN0207_L6.3mm_D2.5mm_P7.62mm_Horizontal | R49, R61, R62 |
| 1 | 100R 100k | R_Axial_DIN0207_L6.3mm_D2.5mm_P7.62mm_Horizontal | R54 |
| 1 | 20K 100k | R_Axial_DIN0207_L6.3mm_D2.5mm_P7.62mm_Horizontal | R55 |
| 2 | 10K 100k | R_Axial_DIN0207_L6.3mm_D2.5mm_P7.62mm_Horizontal | R56, R76 |
| 1 | 100K 100R | R_Axial_DIN0207_L6.3mm_D2.5mm_P7.62mm_Horizontal | R63 |
| 4 | 33K 100k | R_Axial_DIN0207_L6.3mm_D2.5mm_P7.62mm_Horizontal | R64, R65, R70, R71 |
| 2 | 18K 100k | R_Axial_DIN0207_L6.3mm_D2.5mm_P7.62mm_Horizontal | R66, R72 |
| 1 | 100K 33k | R_Axial_DIN0207_L6.3mm_D2.5mm_P7.62mm_Horizontal | R68 |
| 1 | 1K5 20k | R_Axial_DIN0207_L6.3mm_D2.5mm_P7.62mm_Horizontal | R77 |
| 1 | 1K5 10k | R_Axial_DIN0207_L6.3mm_D2.5mm_P7.62mm_Horizontal | R79 |
| 1 | 100K 220k | R_Axial_DIN0207_L6.3mm_D2.5mm_P7.62mm_Horizontal | R82 |
| 1 | 100K 2k2 | R_Axial_DIN0207_L6.3mm_D2.5mm_P7.62mm_Horizontal | R84 |
| 1 | 4K7 100k | R_Axial_DIN0207_L6.3mm_D2.5mm_P7.62mm_Horizontal | R85 |
| 1 | 220k | R_Axial_DIN0207_L6.3mm_D2.5mm_P7.62mm_Horizontal | R86 |
| 1 | 4K7 2k2 | R_Axial_DIN0207_L6.3mm_D2.5mm_P7.62mm_Horizontal | R88 |
| 1 | 2k2 | R_Axial_DIN0207_L6.3mm_D2.5mm_P7.62mm_Horizontal | R89 |
| 2 | 2K2 1k | R_Axial_DIN0207_L6.3mm_D2.5mm_P7.62mm_Horizontal | R90, R91 |
| 1 | 100K 20k | R_Axial_DIN0207_L6.3mm_D2.5mm_P7.62mm_Horizontal | R92 |
| 1 | 100K 3k3 | R_Axial_DIN0207_L6.3mm_D2.5mm_P7.62mm_Horizontal | R93 |
| 1 | 220K 100k | R_Axial_DIN0207_L6.3mm_D2.5mm_P7.62mm_Horizontal | R94 |
| 1 | 220K 1k | R_Axial_DIN0207_L6.3mm_D2.5mm_P7.62mm_Horizontal | R95 |
| 1 | 100K 1k | R_Axial_DIN0207_L6.3mm_D2.5mm_P7.62mm_Horizontal | R96 |
| 1 | 100K 330k | R_Axial_DIN0207_L6.3mm_D2.5mm_P7.62mm_Horizontal | R97 |
| 1 | 2K2 330k | R_Axial_DIN0207_L6.3mm_D2.5mm_P7.62mm_Horizontal | R98 |
| 1 | 2K2 100k | R_Axial_DIN0207_L6.3mm_D2.5mm_P7.62mm_Horizontal | R99 |
| 1 | 20k | R_Axial_DIN0207_L6.3mm_D2.5mm_P7.62mm_Horizontal | R100 |
| 1 | 3k3 | R_Axial_DIN0207_L6.3mm_D2.5mm_P7.62mm_Horizontal | R101 |
DMH Dual VCA Mk3 PCB 2 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 2: common questions
How big is the DMH Dual VCA Mk3 PCB 2?
The DMH Dual VCA Mk3 PCB 2 measures 48 × 121 mm, has 2 copper layers and is 1.6 mm thick.
How many components are on the DMH Dual VCA Mk3 PCB 2?
114 components, from 64 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 2 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 2 design in my own project?
Yes, under the terms of its CC0-1.0 license, which DeMarco chose for the repository.
