Modulation Source
About the Modulation Source PCB
Modulation Source is an open source STM32 PCB design by JordanAceto, published on GitHub under the CC-BY-4.0 license. It is a 2-layer board measuring 99.1 × 68.6 mm, with 73 components from 44 distinct parts.
Its main chip is the STM32F405RGT6, from the STM32 family. Other key parts include the AMS1117-3.3 and TL072. By type, the board carries 34 resistors, 16 capacitors, 6 transistors, 4 ICs, 3 diodes and 1 connector.
It belongs with the audio designs in this gallery.
From the project
modular analog synthesizer for a.p.
PCB with a voltage controlled LFO, sample-and-hold, and white noise source.
Main components on the Modulation Source
Modulation Source bill of materials (BOM)
73 components, 44 distinct parts — part numbers from the project's BOM.
| Qty | Part | Footprint | Refs |
|---|---|---|---|
| 1 | AMS1117-3.3 LM13700 | DIP-16_W7.62mm | U1 |
| 1 | STM32F405RGT6 TL072 | DIP-8_W7.62mm | U2 |
| 2 | TL072 | DIP-8_W7.62mm | U3, U4 |
| 2 | BC560 | TO-92_Inline | Q1, Q2 |
| 1 | BF245A | TO-92_Inline | Q3 |
| 3 | BC550 | TO-92_Inline | Q4, Q5, Q6 |
| 1 | power_in | PinHeader_2x05_P2.54mm_Vertical | J1 |
| 3 | 100k | Potentiometer_Alpha_RD901F-40-00D_Single_Vertical | RV1, RV2, RV3 |
| 2 | 50k | Potentiometer_Bourns_3296W_Vertical | RV4, RV5 |
| 1 | 1k | Potentiometer_Bourns_3296W_Vertical | RV6 |
| 1 | 1MA | Potentiometer_Alpha_RD901F-40-00D_Single_Vertical | RV7 |
| 1 | Conn_01x04 | PinHeader_1x04_P2.54mm_Vertical | inputs1 |
| 1 | Conn_01x06 | PinHeader_1x06_P2.54mm_Vertical | outputs1 |
| 1 | B5819W 1N4148 | D_DO-35_SOD27_P7.62mm_Horizontal | D1 |
| 1 | C2286 1N4148 | D_DO-35_SOD27_P7.62mm_Horizontal | D2 |
| 1 | C72043 1N4148 | D_DO-35_SOD27_P7.62mm_Horizontal | D3 |
| 1 | 10UF 10nF | C_0805_2012Metric_Pad1.15x1.40mm_HandSolder | C1 |
| 1 | 100NF 10nF | C_0805_2012Metric_Pad1.15x1.40mm_HandSolder | C2 |
| 1 | 100NF 220nF | C_0805_2012Metric_Pad1.15x1.40mm_HandSolder | C3 |
| 1 | 10UF 47uF | CP_Radial_D6.3mm_P2.50mm | C4 |
Show 24 more
| Qty | Part | Footprint | Refs |
|---|---|---|---|
| 1 | 10NF 1uF | CP_Radial_D6.3mm_P2.50mm | C5 |
| 2 | 100NF 10uF | CP_Radial_D6.3mm_P2.50mm | C6, C7 |
| 1 | 10UF 100nF | C_0805_2012Metric_Pad1.15x1.40mm_HandSolder | C8 |
| 6 | 100NF 100nF | C_0805_2012Metric_Pad1.15x1.40mm_HandSolder | C9, C10, C11, C12, C13, C14 |
| 2 | 2.2UF 100nF | C_0805_2012Metric_Pad1.15x1.40mm_HandSolder | C15, C16 |
| 1 | 2K2 100k | R_0805_2012Metric_Pad1.15x1.40mm_HandSolder | R1 |
| 1 | 10K 200k | R_0805_2012Metric_Pad1.15x1.40mm_HandSolder | R2 |
| 1 | 2K2 33k | R_0805_2012Metric_Pad1.15x1.40mm_HandSolder | R3 |
| 1 | 10K 270k | R_0805_2012Metric_Pad1.15x1.40mm_HandSolder | R4 |
| 1 | 100 100k | R_0805_2012Metric_Pad1.15x1.40mm_HandSolder | R5 |
| 3 | 2k | R_0805_2012Metric_Pad1.15x1.40mm_HandSolder | R6, R8, R9 |
| 3 | 33k | R_0805_2012Metric_Pad1.15x1.40mm_HandSolder | R7, R11, R12 |
| 3 | 10k | R_0805_2012Metric_Pad1.15x1.40mm_HandSolder | R10, R21, R25 |
| 5 | 15k | R_0805_2012Metric_Pad1.15x1.40mm_HandSolder | R13, R14, R17, R28, R29 |
| 1 | 51k | R_0805_2012Metric_Pad1.15x1.40mm_HandSolder | R15 |
| 5 | 1k | R_0805_2012Metric_Pad1.15x1.40mm_HandSolder | R16, R18, R31, R32, R33 |
| 1 | 27k | R_0805_2012Metric_Pad1.15x1.40mm_HandSolder | R19 |
| 2 | 2k2 | R_0805_2012Metric_Pad1.15x1.40mm_HandSolder | R20, R27 |
| 1 | 390 | R_0805_2012Metric_Pad1.15x1.40mm_HandSolder | R22 |
| 1 | 18k | R_0805_2012Metric_Pad1.15x1.40mm_HandSolder | R23 |
| 1 | 150k | R_0805_2012Metric_Pad1.15x1.40mm_HandSolder | R24 |
| 1 | 1M | R_0805_2012Metric_Pad1.15x1.40mm_HandSolder | R26 |
| 1 | 10M | R_0805_2012Metric_Pad1.15x1.40mm_HandSolder | R30 |
| 1 | 220k | R_0805_2012Metric_Pad1.15x1.40mm_HandSolder | R34 |
Modulation Source design files
The KiCad project lives in the JordanAceto/angelo_modular repository on GitHub; these links point at the commit this page was built from.
Modulation Source: common questions
What microcontroller does the Modulation Source use?
The Modulation Source is built around the STM32F405RGT6, from the STM32 family.
How big is the Modulation Source PCB?
The Modulation Source measures 99.1 × 68.6 mm, has 2 copper layers and is 1.6 mm thick.
How many components are on the Modulation Source?
73 components, from 44 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 Modulation Source design files?
From the JordanAceto/angelo_modular repository on GitHub, which has the KiCad layout and the BOM; the links under Design files point to each one.
Can I use the Modulation Source design in my own project?
Yes, under the terms of its CC-BY-4.0 license, which JordanAceto chose for the repository.
Can I test firmware for the Modulation Source without the hardware?
Yes. HardLabs builds a simulation of the board from its netlist and BOM, so you can run and debug STM32 firmware against it before you order a PCB.
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