2 layers64.8 × 41.3 mm
AudioAmplifier-1
brucemack/KC1FSZ-AudioAmplifier-1
KiCad Project: Audio amplifier based on the LM386. Has digital potentiometer for volume control.
26 parts
2 layers105.6 × 72 mm
Solar mppt charge controller
Pendu1699/solar-mppt-charge-controller2ESP32-based solar MPPT charge controller, custom PCB, perturb & observe tracking algorithm, logged efficiency test data.
- Size
- 105.6 × 72 mm
- Copper layers
- 2
- Thickness
- 1.6 mm
- Parts
- 25
- Nets
- 39
- Pads
- 105
- Tracks, vias
- 195, 19
- Pours
- 1
- Routed
- Yes
- KiCad
- KiCad 10.0 (file 20260206)
- Created
- 24 Jun 2026
- Updated
- 25 Jul 2026
Overview
Solar mppt charge controller is an open-source printed circuit board by Pendu1699, from the Pendu1699/solar-mppt-charge-controller repository on GitHub, published under the MIT licence. It is a 2-layer board of 105.6 × 72 mm with 25 parts on 39 nets, routed with 195 tracks and 19 vias.
It is built around the ESP32-DEVKITM-1, LM2596S-ADJ and MCP4131-103E/P. Its parts include 6 capacitors, 4 ICs, 4 connectors, 3 resistors and 2 diodes. It belongs with the power boards and the ESP32 boards of this library.
Main components
3
ESP32-DEVKITM-1
-- WiFi Modules ROHSEspressif SystemsWiFi Modules
LM2596S-ADJ
TO-263-5-40℃~+125℃@(TA) 1 1.2V~37V 150kHz 3A 40V 80uA Adjustable Buck Buck Built-in No TO-263-5 DC-DC Converters ROHSUMWDC-DC Converters
MCP4131-103E/P
PDIP-8-40℃~+125℃ 0.5LSB 1 1.8V~5.5V 10kΩ 129 1MHz 2.5uA 50ppm/℃ 75Ω Linear Power-on reset RAM SPI ±20% PDIP-8 Digital Potentiometers ROHSMicrochip TechnologyDigital Potentiometers
README
README.mdsolar-mppt-charge-controller
ESP32-based solar MPPT charge controller, custom PCB, perturb & observe tracking algorithm, logged efficiency test data.
Parts
25| Qty | Value | Footprint | References |
|---|---|---|---|
| 4 | 100nF | Capacitor_SMD:C_0805_2012Metric_Pad1.18x1.45mm_HandSolder | C3, C4, C5, C6 |
| 2 | 0.1R | Resistor_SMD:R_2512_6332Metric_Pad1.40x3.35mm_HandSolder | R2, R3 |
| 2 | 1N5822 | Diode_THT:D_DO-201AD_P12.70mm_Horizontal | D1, D2 |
| 1 | 100k | Resistor_SMD:R_0805_2012Metric_Pad1.20x1.40mm_HandSolder | R1 |
| 1 | 100uF | Capacitor_THT:C_Radial_D8.0mm_H7.0mm_P3.50mm | C1 |
| 1 | 100uH | Inductor_THT:L_Axial_L11.0mm_D4.5mm_P15.24mm_Horizontal_Fastron_MECC | L1 |
| 1 | 220uF | Capacitor_THT:C_Radial_D10.0mm_H12.5mm_P5.00mm | C2 |
| 1 | DEBUG_UART | Connector_PinHeader_2.54mm:PinHeader_1x03_P2.54mm_Vertical | J4 |
| 1 | ESP32_DEVKIT | Connector_PinHeader_2.54mm:PinHeader_2x15_P2.54mm_Vertical | J3 |
| 1 | Fuse | Fuse:Fuse_1812_4532Metric_Pad1.30x3.40mm_HandSolder | F1 |
| 1 | INA226xA | Package_SO:SOIC-10_3.9x4.9mm_P1mm | U3 |
| 1 | INA226xB | Package_SO:SOIC-10_3.9x4.9mm_P1mm | U4 |
| 1 | LM2596S-ADJ | Package_TO_SOT_SMD:TO-263-5_TabPin3 | U1 |
| 1 | LOAD_OUT | Connector_PinHeader_2.54mm:PinHeader_1x02_P2.54mm_Vertical | J2 |
| 1 | MCP4131-103 | Package_DIP:DIP-8_W7.62mm | U2 |
| 1 | SOLAR_IN | Connector_PinHeader_2.54mm:PinHeader_1x02_P2.54mm_Vertical | J1 |
The 21 most common of 25 parts.
Questions
How big is the Solar mppt charge controller PCB?
It measures 105.6 × 72 mm and has 2 copper layers, 1.6 mm thick.
What parts does the Solar mppt charge controller use?
25 parts, built around the ESP32-DEVKITM-1, LM2596S-ADJ and MCP4131-103E/P. 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 Solar mppt charge controller KiCad files?
From the Pendu1699/solar-mppt-charge-controller repository on GitHub, at the commit this page was made from: the board is hardware/kicad/solar-mppt-charge-controller/solar-mppt-charge-controller.kicad_pcb and its schematic hardware/kicad/solar-mppt-charge-controller/solar-mppt-charge-controller.kicad_sch. PCBKit opens the board in the browser, with nothing to install.
Can I use the Solar mppt charge controller 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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