2 layers99.3 × 98.6 mm
FlexiblePS
profdc9/FlexibleCharger
An Arduino-controlled charger for different kinds of batteries, or it can be a standalone power supply
118 parts13
2 layers65 × 85 mm
Function Generator
MUDAL/Function-Generator1Custom Function Generator designed and developed by Olaoluwa Raji. This project is a complete embedded system solution with both hardware and software implemented by me. Relevant reference materials are included.
- Size
- 65 × 85 mm
- Copper layers
- 2
- Thickness
- 1.6 mm
- Parts
- 30
- Nets
- 58
- Pads
- 136
- Tracks, vias
- 488, 25
- Pours
- 2
- Routed
- Yes
- KiCad
- KiCad 9.0 (file 20241229)
- Created
- 24 Oct 2024
- Updated
- 12 Jun 2026
Overview
Function Generator is an open-source printed circuit board by MUDAL, from the MUDAL/Function-Generator repository on GitHub, published under the GPL-3.0 licence. It is a 2-layer board of 65 × 85 mm with 30 parts on 58 nets, routed with 488 tracks and 25 vias.
It is built around the LM358, LM6171BIN and L7805, with the AD9833BRM, TIP41 and TIP42 among its other parts. Its parts include 8 resistors, 7 connectors, 5 capacitors, 5 ICs and 2 transistors. It belongs with the STM32 boards of this library.
Main components
6
LM358
SOP-8-18V~18V 0℃~+70℃ 1.2MHz 10nA 2 24mA 3V~36V 500uA 50nA 5mV 80dB Built-in compensation SOP-8 Operational Amplifier ROHSMSKSEMIOperational Amplifier
LM6171BIN
PDIP-8-15V~15V -40℃~+85℃ 1 1.5mV 100MHz 110dB 12nV/√Hz@1kHz 135mA 1uA 2.5mA 3.6V/ns 30nA 6uV/℃ PDIP-8 Operational Amplifier ROHSTexas InstrumentsOperational Amplifier
L7805
TO-220ST0℃~+125℃@(Tj) 1 1.2A 20V 2V@(1A) 42uV 500uA 5V 73dB@(120Hz) Fixed Positive Short Circuit Protection TO-220ST Voltage Regulators - Linear, Low Drop Out (LDO) Regulators ROHSOSENVoltage Regulators - Linear, Low Drop Out (LDO) Regulators
AD9833BRM
-- Direct Digital Synthesis (DDS)Analog DevicesDirect Digital Synthesis (DDS)
TIP41
TO-220TO-220 Bipolar (BJT) ROHSTFBipolar Transistors - BJTTIP42
TO-220-32W 30 3MHz 40V 6A 700uA PNP TO-220-3 Bipolar (BJT) ROHSonsemiBipolar (BJT)
README
README.mdFunction-Generator
Description
This custom function generator is capable of outputting sine, square, and triangle waves of variable amplitude and frequency. An extra requirement of this device is its ability to produce DC voltages of adjustable magnitude and polarity.
Repository Layout
.
├── 3D_Models
├── Diagrams
├── Firmware
├── Images
├── LICENSE
├── PCB
├── README.md
└── SimulationVideo Demos
- Introduction and setup
- System components
- Amplitude control
- Waveform selection
- Frequency adjustment
- DC magnitude and polarity control
Images
Helpful resources
- Rail splitter circuit with virtual push-pull topology: Discussion on EEVBlog
- How the power supply rail splitter circuit works: An article written by Apichet Garaipoom
- EEVBlog discussion on high speed operational amplifiers
- What is Slew Rate all about?
- Reddit discussion on high speed operational amplifiers
- Ivanchenko59: AD9833-DDS-Generator STM32 library
- Mahamudul Hasan: Interfacing STM32 with I2C LCD: HAL example code included
- AD9833 Programmable Waveform Generator: Datasheet
- STM32 Blue Pill 3D model by Denshi Kousaku
- BNC Connector 3D model by Daniel Forero Morales
Parts
30| Qty | Value | Footprint | References |
|---|---|---|---|
| 2 | 0.33uF | Capacitor_THT:C_Disc_D4.3mm_W1.9mm_P5.00mm | C3, C4 |
| 2 | 10k | Connector_PinHeader_2.54mm:PinHeader_1x03_P2.54mm_Vertical | RV1, RV2 |
| 2 | 10k | Resistor_THT:R_Axial_DIN0207_L6.3mm_D2.5mm_P7.62mm_Horizontal | R1, R2 |
| 2 | 1k | Resistor_THT:R_Axial_DIN0207_L6.3mm_D2.5mm_P7.62mm_Horizontal | R7, R8 |
| 2 | 22k | Resistor_THT:R_Axial_DIN0207_L6.3mm_D2.5mm_P7.62mm_Horizontal | R3, R5 |
| 2 | 2k | Resistor_THT:R_Axial_DIN0207_L6.3mm_D2.5mm_P7.62mm_Horizontal | R4, R6 |
| 2 | 470uF | Capacitor_THT:CP_Radial_D10.0mm_P5.00mm | C1, C2 |
| 2 | Barrel_Jack | Connector_PinHeader_2.54mm:PinHeader_1x03_P2.54mm_Vertical | J1, J7 |
| 1 | 0.1uF | Capacitor_THT:C_Disc_D4.3mm_W1.9mm_P5.00mm | C5 |
| 1 | 50-ohm BNC | Connector_Coaxial:BNC_Amphenol_B6252HB-NPP3G-50_Horizontal | J6 |
| 1 | AD9833 | Connector_PinSocket_2.54mm:PinSocket_1x06_P2.54mm_Vertical | J5 |
| 1 | Buttons | Connector_PinHeader_2.54mm:PinHeader_1x05_P2.54mm_Vertical | J2 |
| 1 | L7805 | Package_TO_SOT_THT:TO-220-3_Vertical | U3 |
| 1 | LCD | Connector_PinHeader_2.54mm:PinHeader_1x04_P2.54mm_Vertical | J3 |
| 1 | LM358 | Package_DIP:DIP-8_W7.62mm | U1 |
| 1 | LM6171 | Package_SO:SOIC-8_3.9x4.9mm_P1.27mm | U4 |
| 1 | STM32 Blue Pill | Blue_Pill:Blue_Pill | U2 |
| 1 | SW_SPDT | Connector_PinHeader_2.54mm:PinHeader_1x03_P2.54mm_Vertical | SW1 |
| 1 | Selector | Connector_PinHeader_2.54mm:PinHeader_1x03_P2.54mm_Vertical | J4 |
| 1 | TIP41 | Package_TO_SOT_THT:TO-220-3_Vertical | Q1 |
| 1 | TIP42 | Package_TO_SOT_THT:TO-220-3_Vertical | Q2 |
| 1 | TL071 | Package_DIP:DIP-8_W7.62mm | U5 |
Questions
How big is the Function Generator PCB?
It measures 65 × 85 mm and has 2 copper layers, 1.6 mm thick.
What parts does the Function Generator use?
30 parts, built around the LM358, LM6171BIN, L7805 and AD9833BRM. 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 Function Generator KiCad files?
From the MUDAL/Function-Generator repository on GitHub, at the commit this page was made from: the board is PCB/function_generator/function_generator.kicad_pcb and its schematic PCB/function_generator/function_generator.kicad_sch. PCBKit opens the board in the browser, with nothing to install.
Can I use the Function Generator design in my own project?
Its repository publishes it under the GPL-3.0 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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