2 layers83.3 × 65.3 mm
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46 parts14kMIT
2 layers40 × 100 mm
Bucla-style Sallen-Key VCF and VCA
- Size
- 40 × 100 mm
- Copper layers
- 2
- Thickness
- 1.6 mm
- Parts
- 66
- Nets
- 60
- Pads
- 199
- Tracks, vias
- 289, 5
- Pours
- 1
- Routed
- Yes
- KiCad
- KiCad 8.0 (file 20240108)
- Created
- 22 Sep 2024
- Updated
- 26 May 2026
Overview
Lpg is an open-source printed circuit board by xdylanm, from the xdylanm/low-pass-gate repository on GitHub, published under the MIT licence. It is a 2-layer board of 40 × 100 mm with 66 parts on 60 nets, routed with 289 tracks and 5 vias.
It is built around the BC547. Its parts include 26 resistors, 16 capacitors, 5 diodes, 5 connectors and 4 ICs.
Main components
1README
README.mdLow Pass Gate
Buchla-style VCA and Sallen-Key VCF with vactrols.
Parts
66| Qty | Value | Footprint | References |
|---|---|---|---|
| 7 | 100k | Resistor_THT:R_Axial_DIN0204_L3.6mm_D1.6mm_P2.54mm_Vertical | R3, R4, R5, R9, R14, R16, R17 |
| 4 | 100k | Audio_Potentiometer_THT:Potentiometer_Bourns_PTV09A-1_Single_Vertical | RV1, RV2, RV5, RV6 |
| 4 | 100n | Capacitor_THT:C_Disc_D5.0mm_W2.5mm_P2.50mm | C9, C13, C14, C16 |
| 4 | AudioJack2_SwitchT | AudioJacks:Jack_3.5mm_QingPu_WQP-PJ301M-12_Vertical | J1, J2, J3, J4 |
| 3 | 47k | Resistor_THT:R_Axial_DIN0204_L3.6mm_D1.6mm_P2.54mm_Vertical | R6, R19, R24 |
| 2 | 10 | Resistor_THT:R_Axial_DIN0207_L6.3mm_D2.5mm_P2.54mm_Vertical | R22, R23 |
| 2 | 10k | Resistor_THT:R_Axial_DIN0207_L6.3mm_D2.5mm_P15.24mm_Horizontal | R12, R25 |
| 2 | 10k | Resistor_THT:R_Axial_DIN0204_L3.6mm_D1.6mm_P2.54mm_Vertical | R18, R26 |
| 2 | 10u | Capacitor_THT:CP_Radial_D5.0mm_P2.00mm | C11, C12 |
| 2 | 150k | Resistor_THT:R_Axial_DIN0204_L3.6mm_D1.6mm_P2.54mm_Vertical | R1, R21 |
| 2 | 15k | Resistor_THT:R_Axial_DIN0204_L3.6mm_D1.6mm_P2.54mm_Vertical | R8, R10 |
| 2 | 1k | Resistor_THT:R_Axial_DIN0204_L3.6mm_D1.6mm_P2.54mm_Vertical | R15, R20 |
| 2 | BC547 | Package_TO_SOT_THT:TO-92_Inline_Wide | Q1, Q2 |
| 2 | D_Schottky | Diode_THT:D_DO-41_SOD81_P2.54mm_Vertical_AnodeUp | D2, D3 |
| 2 | LED | LED_THT:LED_D3.0mm | D4, D5 |
| 2 | VTL5C | OptoDevice:PerkinElmer_VTL5C | U2, U3 |
| 1 | 100n | Capacitor_THT:C_Disc_D5.0mm_W2.5mm_P5.00mm | C15 |
| 1 | 10n | Capacitor_THT:C_Disc_D5.0mm_W2.5mm_P2.50mm | C8 |
| 1 | 1n | Capacitor_THT:C_Disc_D5.0mm_W2.5mm_P5.00mm | C5 |
| 1 | 1u | Capacitor_THT:C_Disc_D5.0mm_W2.5mm_P2.50mm | C2 |
| 1 | 20k | Potentiometer_THT:Potentiometer_Piher_PT-6-V_Vertical | RV3 |
| 1 | 220p | Capacitor_THT:C_Disc_D5.0mm_W2.5mm_P2.50mm | C3 |
| 1 | 22p | Capacitor_THT:C_Disc_D5.0mm_W2.5mm_P2.50mm | C6 |
| 1 | 2n | Capacitor_THT:C_Disc_D5.0mm_W2.5mm_P2.50mm | C1 |
| 1 | 3.9V Zener | Diode_THT:D_DO-35_SOD27_P2.54mm_Vertical_AnodeUp | D1 |
| 1 | 33k | Resistor_THT:R_Axial_DIN0204_L3.6mm_D1.6mm_P2.54mm_Vertical | R7 |
| 1 | 470 | Resistor_THT:R_Axial_DIN0207_L6.3mm_D2.5mm_P10.16mm_Horizontal | R11 |
| 1 | 470k | Resistor_THT:R_Axial_DIN0204_L3.6mm_D1.6mm_P2.54mm_Vertical | R2 |
| 1 | 470n | Capacitor_THT:C_Disc_D5.0mm_W2.5mm_P2.50mm | C10 |
| 1 | 47n | Capacitor_THT:C_Disc_D5.0mm_W2.5mm_P2.50mm | C7 |
| 1 | 4M7 | Resistor_THT:R_Axial_DIN0204_L3.6mm_D1.6mm_P2.54mm_Vertical | R13 |
| 1 | 4n7 | Capacitor_THT:C_Disc_D5.0mm_W2.5mm_P2.50mm | C4 |
| 1 | 50k | Audio_Potentiometer_THT:Potentiometer_Bourns_PTV09A-1_Single_Vertical | RV4 |
| 1 | Conn_02x05_Odd_Even | Connector_IDC:IDC-Header_2x05_P2.54mm_Vertical | J5 |
| 1 | SW_4P3T_x4 | Switches:SW_4P3T_SS-43D01_NoFrame | SW1 |
| 1 | SW_SPDT | Switches:SW_Dailywell_SPDT_2MS1T1B1M1 | SW2 |
| 1 | TL074 | Package_DIP:DIP-14_W7.62mm_Socket | U1 |
| 1 | TLC555xP | Package_DIP:DIP-8_W7.62mm_Socket | U4 |
Questions
How big is the Lpg PCB?
It measures 40 × 100 mm and has 2 copper layers, 1.6 mm thick.
What parts does the Lpg use?
66 parts, built around the BC547. 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 Lpg KiCad files?
From the xdylanm/low-pass-gate repository on GitHub, at the commit this page was made from: the board is hardware/lpg/lpg.kicad_pcb and its schematic hardware/lpg/lpg.kicad_sch. PCBKit opens the board in the browser, with nothing to install.
Can I use the Lpg design in my own project?
Its repository publishes it under the MIT licence: you may reuse it on that licence's terms (keep the author's notice, and for a copyleft licence share your changes alike).
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