2 layers20 × 128.5 mm
Noname
vk2seb/formant_vco_prototype
KiCAD EDA files for an analog voltage-controlled oscillator compatible with modular Eurorack synthesizers.
76 parts37
2 layers39.8 × 110.4 mm
Formant vco
vk2seb/formant_vco_prototype37KiCAD EDA files for an analog voltage-controlled oscillator compatible with modular Eurorack synthesizers.
- Size
- 39.8 × 110.4 mm
- Copper layers
- 2
- Thickness
- 1.6 mm
- Parts
- 82
- Nets
- 56
- Pads
- 262
- Tracks, vias
- 598, 92
- Pours
- 2
- Routed
- Yes
- KiCad
- KiCad 4
- Created
- 12 Jul 2017
- Updated
- 14 Aug 2017
Overview
Formant vco is an open-source printed circuit board by vk2seb, from the vk2seb/formant_vco_prototype repository on GitHub. It is a 2-layer board of 39.8 × 110.4 mm with 82 parts on 56 nets, routed with 598 tracks and 92 vias.
It is built around the TL072, CD4093 and LM3046M, with the REF102AU among its other parts. Its parts include 32 resistors, 18 capacitors, 7 ICs, 5 transistors and 5 connectors. It belongs with the audio and music boards of this library.
Main components
4
TL072
SOP-8-18V~18V 0℃~+70℃ 1.4mA 1.5nA 10V/us 10mV 2 2.5nA 3MHz 85dB SOP-8 Operational Amplifier ROHSGcoreOperational Amplifier
CD4093
SOP-14Logic GatesSlkorLM3046M
SOIC-14_L8.7-W3.9-P1.27-LS6.0-BLSOIC-14 Bipolar (BJT) ROHSTexas InstrumentsBipolar (BJT)
REF102AU
SOIC-8-150mil-25℃~+85℃ 1.4mA 10V 10mA 10ppm/℃ 11.4V~36V 5uVp-p Fixed Series ±0.1% SOIC-8-150mil Voltage Reference ROHSTexas InstrumentsVoltage Reference
README
README.mdSMD Formant VCO Prototype
KiCAD files for eurorack-compatible formant-based VCO design. Mostly created just to learn KiCAD.
Video on construction/operation is here: https://www.youtube.com/watch?v=rq4ovZ2om6k
ERRATA [V1A] (To be fixed in future revision)
- The TL071 op-amp in the CAD files is arbitrary, I actually used an LM358. Just use whatever 8-pin SOIC dual op-amp you like.
- Diodes (D1..) are incorrect footprint. Change this to suit.
- 10V reference chip, VCC is not connected to +V properly. This must be bridged.
- +/-15V designator actually should be +/-12V to match eurorack. Doesn't make any electrical difference, but it's what the schematic says.
- Be careful with tantalum capacitor orientation, check with schematic. Silkscreen 'line' is negative, not positive.
Parts
82| Qty | Value | Footprint | References |
|---|---|---|---|
| 7 | 100K | Resistors_SMD:R_0603 | R1, R2, R5, R6, R7, R8, R31 |
| 7 | 100n | Capacitors_SMD:C_0805 | C5, C6, C7, C8, C9, C10, C11 |
| 5 | 10K | Resistors_SMD:R_0603 | R3, R11, R16, R18, R21 |
| 5 | 1K | Resistors_SMD:R_0603 | R9, R10, R13, R17, R32 |
| 5 | BC850 | TO_SOT_Packages_SMD:SOT-23 | Q1, Q2, Q3, Q4, Q5 |
| 4 | 10u | Capacitors_Tantalum_SMD:CP_Tantalum_Case-A_EIA-3216-18_Reflow | C12, C13, C15, C16 |
| 4 | JACK_2P | footprint_pj3010bm:pj301bm | J1, J2, J3, J5 |
| 4 | TL072 | Housings_SOIC:SOIC-8_3.9x4.9mm_Pitch1.27mm | U2, U4, U5, U7 |
| 3 | 100K LIN | footprint_alpha_d_pot:alpha_d_pot_vert | RV2, RV3, RV4 |
| 3 | 10K | footprint_trimmer:bourns_trimmer_tc33x-2 | RV7, RV8, RV9 |
| 2 | 100R | Resistors_SMD:R_0603 | R24, R26 |
| 2 | 1N4148 | Diodes_SMD:D_0805 | D1, D2 |
| 2 | 1u | Capacitors_Tantalum_SMD:CP_Tantalum_Case-A_EIA-3216-18_Reflow | C1, C2 |
| 2 | LED | LEDs:LED_D5.0mm | D3, D4 |
| 2 | SWITCH_SPST | Pin_Headers:Pin_Header_Straight_2x01_Pitch2.54mm | SW1, SW2 |
| 1 | 100p | Capacitors_SMD:C_0805 | C3 |
| 1 | 100u | Capacitors_Tantalum_SMD:CP_Tantalum_Case-A_EIA-3216-18_Reflow | C4 |
| 1 | 10K LIN | footprint_alpha_d_pot:alpha_d_pot_vert | RV1 |
| 1 | 10n | Capacitors_SMD:C_0805 | C18 |
| 1 | 12p | Capacitors_SMD:C_0805 | C17 |
| 1 | 1K2 | Resistors_SMD:R_0603 | R23 |
| 1 | 1M | Resistors_SMD:R_0603 | R15 |
| 1 | 200R | footprint_trimmer:bourns_trimmer_tc33x-2 | RV5 |
| 1 | 20K | Resistors_SMD:R_0603 | R22 |
| 1 | 220R | Resistors_SMD:R_0603 | R20 |
| 1 | 240R | Resistors_SMD:R_0603 | R25 |
| 1 | 2K4 | Resistors_SMD:R_0603 | R12 |
| 1 | 330R | Resistors_SMD:R_0603 | R30 |
| 1 | 360R | Resistors_SMD:R_0603 | R27 |
| 1 | 3K3 | Resistors_SMD:R_0603 | R29 |
| 1 | 430K | Resistors_SMD:R_0603 | R4 |
| 1 | 470p | Capacitors_SMD:C_0805 | C14 |
| 1 | 56K | Resistors_SMD:R_0603 | R19 |
| 1 | 5K | footprint_trimmer:bourns_trimmer_tc33x-2 | RV6 |
| 1 | 6K2 | Resistors_SMD:R_0603 | R28 |
| 1 | 750R | Resistors_SMD:R_0603 | R14 |
| 1 | CD4093 | Housings_SOIC:SOIC-14_3.9x8.7mm_Pitch1.27mm | U3 |
| 1 | CONN_02X08 | Connectors:IDC_Header_Straight_16pins | J4 |
| 1 | LM3046 | Housings_SOIC:SOIC-14_3.9x8.7mm_Pitch1.27mm | U6 |
| 1 | REF102 | Housings_SOIC:SOIC-8_3.9x4.9mm_Pitch1.27mm | U1 |
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Questions
How big is the Formant vco PCB?
It measures 39.8 × 110.4 mm and has 2 copper layers, 1.6 mm thick.
What parts does the Formant vco use?
82 parts, built around the TL072, CD4093, LM3046M and REF102AU. 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 Formant vco KiCad files?
From the vk2seb/formant_vco_prototype repository on GitHub, at the commit this page was made from: the board is formant_vco.kicad_pcb. PCBKit opens the board in the browser, with nothing to install.
Can I use the Formant vco design in my own project?
Its repository states no licence, so its author keeps all rights: ask vk2seb before reusing the design.