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2 layers48.3 × 99.1 mmModulation source, the printed circuit board in 3D

Modulation source

JordanAceto/modulation_source6

Eurorack compatible pcb with sine/square VCLFO, white and pink noise, and sample & hold

Open in PCBKitView on GitHub.kicad_pcb
Size
48.3 × 99.1 mm
Copper layers
2
Thickness
1.6 mm
Parts
95
Nets
66
Pads
261
Tracks, vias
465, 68
Pours
10
Routed
Yes
KiCad
KiCad 5 (file 20171130)
Created
12 Dec 2020
Updated
15 Jan 2022

Overview

Modulation source is an open-source printed circuit board by JordanAceto, from the JordanAceto/modulation_source repository on GitHub. It is a 2-layer board of 48.3 × 99.1 mm with 95 parts on 66 nets, routed with 465 tracks and 68 vias.

It is built around the TL072, LM13700M and PJ301M-12, with the 1N4148W, MMBT3904 and MMBT3906 among its other parts. Its parts include 40 resistors, 26 capacitors, 9 connectors, 5 ICs and 5 transistors.

Main components

7

README

README.md

Eurorack Modulation Source

SCHEMATIC

Features:

  • Sine and Square wave voltage controlled LFO
  • LED indicator shown the LFO speed
  • White and Pink noise source
  • Sample and Hold
  • Convenient normalization
    • LFO square wave normalled to the S&H clock input
    • White noise normalled to the S&H signal input
  • There is a pcb front panel, for a cheap and cheerful panel option

Errata:

  • The pink noise gain is a little hot, change R30 to around 39k to bring the pink noise level down if desired

Status of the project:

TaskStatus
Schematic capture☑
PCB layout☑
Test build☑
Safe to order boards☑

Parts

95
QtyValueFootprintReferences
12100nFCapacitor_SMD:C_0805_2012Metric_Pad1.15x1.40mm_HandSolderC4, C14, C18, C19, C20, C21, C22, C23, C24, C25, C26, C27
8PJ301M-12modulation_source:PJ301M-12J1, J2, J3, J4, J5, J6, J7, J8
510kResistor_SMD:R_0805_2012Metric_Pad1.15x1.40mm_HandSolderR9, R14, R17, R30, R32
51kResistor_SMD:R_0805_2012Metric_Pad1.15x1.40mm_HandSolderR21, R26, R27, R39, R40
533kResistor_SMD:R_0805_2012Metric_Pad1.15x1.40mm_HandSolderR7, R23, R24, R25, R33
4TL072Package_SO:SOIC-8_3.9x4.9mm_P1.27mmU2, U3, U4, U5
3100kResistor_SMD:R_0805_2012Metric_Pad1.15x1.40mm_HandSolderR1, R3, R34
310nFCapacitor_SMD:C_0805_2012Metric_Pad1.15x1.40mm_HandSolderC2, C3, C12
310uFCapacitor_SMD:C_0805_2012Metric_Pad1.15x1.40mm_HandSolderC6, C16, C17
31N4148WDiode_SMD:D_SOD-123D2, D3, D4
32k2Resistor_SMD:R_0805_2012Metric_Pad1.15x1.40mm_HandSolderR8, R13, R18
2100kPotentiometer_THT:Potentiometer_Alpha_RD901F-40-00D_Single_VerticalRV1, RV2
212kResistor_SMD:R_0805_2012Metric_Pad1.15x1.40mm_HandSolderR10, R11
215kResistor_SMD:R_0805_2012Metric_Pad1.15x1.40mm_HandSolderR19, R20
21MResistor_SMD:R_0805_2012Metric_Pad1.15x1.40mm_HandSolderR29, R36
22kResistor_SMD:R_0805_2012Metric_Pad1.15x1.40mm_HandSolderR5, R6
23k3Resistor_SMD:R_0805_2012Metric_Pad1.15x1.40mm_HandSolderR22, R31
250kPotentiometer_THT:Potentiometer_Bourns_3296W_VerticalRV3, RV4
2MMBT3904Package_TO_SOT_SMD:SOT-23_HandsolderingQ3, Q4
2MMBT3906Package_TO_SOT_SMD:SOT-23_HandsolderingQ1, Q2
1100pFCapacitor_SMD:C_0805_2012Metric_Pad1.15x1.40mm_HandSolderC8
1120kResistor_SMD:R_0805_2012Metric_Pad1.15x1.40mm_HandSolderR4
1150kResistor_SMD:R_0805_2012Metric_Pad1.15x1.40mm_HandSolderR28
118kResistor_SMD:R_0805_2012Metric_Pad1.15x1.40mm_HandSolderR16
11M8Resistor_SMD:R_0805_2012Metric_Pad1.15x1.40mm_HandSolderR37
11MAPotentiometer_THT:Potentiometer_Alpha_RD901F-40-00D_Single_VerticalRV5
11nFCapacitor_SMD:C_0805_2012Metric_Pad1.15x1.40mm_HandSolderC10
11uFCapacitor_SMD:C_0805_2012Metric_Pad1.15x1.40mm_HandSolderC7
1220kResistor_SMD:R_0805_2012Metric_Pad1.15x1.40mm_HandSolderR2
127kResistor_SMD:R_0805_2012Metric_Pad1.15x1.40mm_HandSolderR12
1330kResistor_SMD:R_0805_2012Metric_Pad1.15x1.40mm_HandSolderR35
1330pFCapacitor_SMD:C_0805_2012Metric_Pad1.15x1.40mm_HandSolderC9
133nFCapacitor_SMD:C_0805_2012Metric_Pad1.15x1.40mm_HandSolderC13
1390Resistor_SMD:R_0805_2012Metric_Pad1.15x1.40mm_HandSolderR15
13n3Capacitor_SMD:C_0805_2012Metric_Pad1.15x1.40mm_HandSolderC11
1470nFCapacitor_THT:C_Rect_L7.0mm_W3.5mm_P5.00mmC1
147uFCapacitor_SMD:C_0805_2012Metric_Pad1.15x1.40mm_HandSolderC5
14M7Resistor_SMD:R_0805_2012Metric_Pad1.15x1.40mm_HandSolderR38
15kPotentiometer_THT:Potentiometer_Bourns_3296W_VerticalRV6
1BC550Package_TO_SOT_THT:TO-92_Inline_WideQ5
1LM13700Package_SO:SOIC-16_3.9x9.9mm_P1.27mmU1
1power_inConnector_PinHeader_2.54mm:PinHeader_2x05_P2.54mm_VerticalJ9
1red_green_LEDLED_THT:LED_D5.0mmD1

Questions

How big is the Modulation source PCB?

It measures 48.3 × 99.1 mm and has 2 copper layers, 1.6 mm thick.

What parts does the Modulation source use?

95 parts, built around the TL072, LM13700M, PJ301M-12 and 1N4148W. 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 Modulation source KiCad files?

From the JordanAceto/modulation_source repository on GitHub, at the commit this page was made from: the board is main_pcb/kicad_docs/modulation_source.kicad_pcb. PCBKit opens the board in the browser, with nothing to install.

Can I use the Modulation source design in my own project?

Its repository states no licence, so its author keeps all rights: ask JordanAceto before reusing the design.

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