2 layers100 × 70 mm
DMH VCLFO v2 PCB Submodule
DeMarco/DMH-VCLFO
Kosmo format Voltage Controlled tripple LFO module
90 parts2
2 layers100 × 70 mm
DMH VCLFO SingleUnit
DeMarco/DMH-VCLFO2Kosmo format Voltage Controlled tripple LFO module
- Size
- 100 × 70 mm
- Copper layers
- 2
- Thickness
- 1.6 mm
- Parts
- 131
- Nets
- 97
- Pads
- 358
- Tracks, vias
- 398, 0
- Pours
- 1
- Routed
- Yes
- KiCad
- KiCad 9.0 (file 20241229)
- Created
- 26 Apr 2025
- Updated
- 3 Oct 2026
Overview
DMH VCLFO SingleUnit is an open-source printed circuit board by DeMarco, from the DeMarco/DMH-VCLFO repository on GitHub. It is a 2-layer board of 100 × 70 mm with 131 parts on 97 nets, routed with 398 tracks and 0 vias.
It is built around the BC548, BC558 and J113, with the SB140 among its other parts. Its parts include 62 resistors, 23 capacitors, 13 transistors, 10 diodes and 8 connectors.
Main components
4
BC548
TO-92TO-92 Bipolar (BJT) ROHSDDFBipolar (BJT)BC558
TO-921 PNP 100mA 100nA 150MHz 30V 500mW 5V 800 90mV、250mV PNP TO-92 Bipolar (BJT) ROHSDDFBipolar (BJT)
J113
TO-92-3LTO-92-3L JFETs ROHSonsemiJFETs
SB140
DO-41-65℃~+125℃ 1 Independent 1A 30A 40V 500mV@1A 500uA@40V DO-41 Schottky Diodes ROHSonsemiSchottky Diodes
README
README.mdDMH-VCLFO
Kosmo format Voltage Controlled tripple LFO module
Features
6 waveforms, all +5V/-5V
- Square
- Saw
- Ramp
- Random
- Sine
- Triangle
3 frequency ranges
- Fast
- Super Fast (Audio rate!)
- Slow
Hard Sync input
Can also do VCO duties!
Excellent V/Oct trackig over 5 octaves
CV Amount knob serves as Fine Frequency Adjustment when no cable is connected to CV input
Adjustable range for Fine knob
Current consumption:
+12V --> 65mA
-12V --> 60mA
Dimensions
Height: 20cm
Width: 10cm
Depth: 10cm
PCB set
- Panel
- Controls
- Main
- Submodule (x3)
Final Gerbers available in "Gerbers" folder
Single VCLFO version
The KiCad project named "Single Unit" contains the circuit for one VCLFO in a single page schematic without any inter-PCB connectors. This can be useful if anyone is interested in designing their own PCBs or entire modules in non-Kosmo dimensions.
Font
For viewing/customizing in KiCad, I recommend downloading and installing the Nulshock font from Typodermic: https://typodermicfonts.com/nulshock/
Parts
131| Qty | Value | Footprint | References |
|---|---|---|---|
| 19 | 100k | Resistor_THT:R_Axial_DIN0207_L6.3mm_D2.5mm_P7.62mm_Horizontal | R2, R4, R5, R6, R8, R10, R55, R58, R70, R71, R78, R81, R82, R83, R85, R87 +3 |
| 10 | 10k | Resistor_THT:R_Axial_DIN0207_L6.3mm_D2.5mm_P7.62mm_Horizontal | R7, R11, R13, R16, R53, R56, R57, R77, R93, R95 |
| 9 | 100nF | Capacitor_THT:C_Disc_D4.3mm_W1.9mm_P5.00mm | C4, C13, C14, C15, C16, C17, C18, C56, C60 |
| 7 | 1k | Resistor_THT:R_Axial_DIN0207_L6.3mm_D2.5mm_P7.62mm_Horizontal | R12, R17, R61, R68, R79, R86, R91 |
| 7 | BC548 | Package_TO_SOT_THT:TO-92L_Inline_Wide | Q1, Q7, Q8, Q11, Q12, Q14, Q16 |
| 7 | TS_Jack_6.35mm_Sw | SynthStuff:CUI_MJ-63052A | J1, J2, J3, J4, J5, J6, J7 |
| 6 | 1N4148 | Diode_THT:D_DO-35_SOD27_P7.62mm_Horizontal | D7, D8, D9, D10, D11, D12 |
| 4 | TL074 | Package_DIP:DIP-14_W7.62mm_Socket | U1, U10, U11, U12 |
| 3 | 100pF | Capacitor_THT:C_Disc_D3.0mm_W2.0mm_P2.50mm | C2, C8, C12 |
| 3 | 14k | Resistor_THT:R_Axial_DIN0207_L6.3mm_D2.5mm_P7.62mm_Horizontal | R54, R66, R73 |
| 3 | 18k | Resistor_THT:R_Axial_DIN0207_L6.3mm_D2.5mm_P7.62mm_Horizontal | R52, R60, R69 |
| 3 | 47k | Resistor_THT:R_Axial_DIN0207_L6.3mm_D2.5mm_P7.62mm_Horizontal | R62, R63, R92 |
| 3 | 82k | Resistor_THT:R_Axial_DIN0207_L6.3mm_D2.5mm_P7.62mm_Horizontal | R9, R84, R90 |
| 3 | BC558 | Package_TO_SOT_THT:TO-92L_Inline_Wide | Q2, Q13, Q15 |
| 3 | J113 | Package_TO_SOT_THT:TO-92L_Inline | Q9, Q10, Q17 |
| 3 | SW_SPDT | SynthStuff:Toggle_Switch_TE | SW1, SW3, SW4 |
| 2 | 100R | Resistor_THT:R_Axial_DIN0207_L6.3mm_D2.5mm_P7.62mm_Horizontal | R80, R96 |
| 2 | 10pF | Capacitor_THT:C_Disc_D3.0mm_W2.0mm_P2.50mm | C10, C11 |
| 2 | 1nF | Capacitor_THT:C_Disc_D4.3mm_W1.9mm_P5.00mm | C1, C6 |
| 2 | 22nF | Capacitor_THT:C_Disc_D4.3mm_W1.9mm_P5.00mm | C7, C63 |
| 2 | 2k2 | Resistor_THT:R_Axial_DIN0207_L6.3mm_D2.5mm_P7.62mm_Horizontal | R64, R65 |
| 2 | 2k87 | Resistor_THT:R_Axial_DIN0207_L6.3mm_D2.5mm_P7.62mm_Horizontal | R72, R76 |
| 2 | 3k3 | Resistor_THT:R_Axial_DIN0207_L6.3mm_D2.5mm_P7.62mm_Horizontal | R14, R15 |
| 2 | 47uF | Capacitor_THT:CP_Radial_D5.0mm_P2.00mm | C55, C59 |
| 2 | B100k | SynthStuff:Potentiometer_Alpha_RD901F-40-00D_Single_Vertical | RV1, RV2 |
| 2 | SB140 | Diode_THT:D_DO-41_SOD81_P10.16mm_Horizontal | D25, D26 |
| 1 | 100k | Potentiometer_THT:Potentiometer_Bourns_3296W_Vertical | RV13 |
| 1 | 10M | Resistor_THT:R_Axial_DIN0207_L6.3mm_D2.5mm_P7.62mm_Horizontal | R3 |
| 1 | 10k | Potentiometer_THT:Potentiometer_Bourns_3296W_Vertical | RV3 |
| 1 | 10k3380 | Resistor_THT:R_Axial_DIN0204_L3.6mm_D1.6mm_P1.90mm_Vertical | TH1 |
| 1 | 1M | Resistor_THT:R_Axial_DIN0207_L6.3mm_D2.5mm_P7.62mm_Horizontal | R75 |
| 1 | 1k | Potentiometer_THT:Potentiometer_Bourns_3296W_Vertical | RV4 |
| 1 | 1uF | Capacitor_THT:C_Disc_D4.3mm_W1.9mm_P5.00mm | C3 |
| 1 | 2.2nF | Capacitor_THT:C_Disc_D3.0mm_W2.0mm_P2.50mm | C9 |
| 1 | 220nF | Capacitor_THT:C_Disc_D4.3mm_W1.9mm_P5.00mm | C5 |
| 1 | 300k | Resistor_THT:R_Axial_DIN0207_L6.3mm_D2.5mm_P7.62mm_Horizontal | R1 |
| 1 | 330R | Resistor_THT:R_Axial_DIN0207_L6.3mm_D2.5mm_P7.62mm_Horizontal | R74 |
| 1 | 33k | Resistor_THT:R_Axial_DIN0207_L6.3mm_D2.5mm_P7.62mm_Horizontal | R59 |
| 1 | 390 | Resistor_THT:R_Axial_DIN0207_L6.3mm_D2.5mm_P7.62mm_Horizontal | R67 |
| 1 | 50k | Potentiometer_THT:Potentiometer_Bourns_3296W_Vertical | RV14 |
| 1 | IDC_02x08 | SynthStuff:IDC-Header_2x08_P2.54mm_Vertical_Eurorack | J100 |
| 1 | LED_Red | LED_THT:LED_D3.0mm | D1 |
| 1 | LED_Yellow | LED_THT:LED_D3.0mm | D2 |
| 1 | SPDT_OnOffOn | SynthStuff:Toggle_Switch_TE | SW2 |
More from DeMarco/DMH-VCLFO
3- 2 layers98 × 175 mm
- 2 layers98 × 120.5 mm
DMH VCLFO v2 PCB Controls
DeMarco/DMH-VCLFO
Kosmo format Voltage Controlled tripple LFO module
67 parts2
Similar boards
- 2 layers98 × 135 mm
- 2 layers148 × 175 mm
- 2 layers48 × 120.5 mm
DMH S H Noise PCB
DeMarco/DMH-S-H-Noise
Implementation of the S&H + Noise Generator circuits by Moritz Klein into Kosmo format.
82 parts1 - 2 layers49 × 175 mm
DMH Dual VCA Mk3 PCB Main
DeMarco/DMH-Dual-VCA-Mk3
Version 3 of my stereo VCA in Kosmo format
98 partsCC0-1.0 - 4 layers99.6 × 99.8 mm
- 2 layers239.6 × 239.9 mm
- 2 layers242.5 × 102.5 mm
- 2 layers100 × 100 mm
Questions
How big is the DMH VCLFO SingleUnit PCB?
It measures 100 × 70 mm and has 2 copper layers, 1.6 mm thick.
What parts does the DMH VCLFO SingleUnit use?
131 parts, built around the BC548, BC558, J113 and SB140. 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 VCLFO SingleUnit KiCad files?
From the DeMarco/DMH-VCLFO repository on GitHub, at the commit this page was made from: the board is DMH_VCLFO_SingleUnit/DMH_VCLFO_SingleUnit.kicad_pcb and its schematic Archived/DMH_VCLFO_PCB_1/Breadboard_Layout.kicad_sch. PCBKit opens the board in the browser, with nothing to install.
Can I use the DMH VCLFO SingleUnit design in my own project?
Its repository states no licence, so its author keeps all rights: ask DeMarco before reusing the design.