Charging, regulation and energy-harvesting circuits with published two-layer source boards. ViaGrid adaptations require a new layout and electrical and thermal validation for the intended supply and load.
Published open-source PCB projects
Open source · CC BY-SA 3.0 BQ24074 Solar / USB Charger
Charge a single-cell lithium battery from USB, DC or a solar panel while a separate power path supplies the project.
Open source · CC BY-SA 3.0 Constant-Current LED Boost Driver
Drive series LEDs or LED filaments at a selected current, with a PWM dimming input.
Open source · MIT LiFePO4wered/USB Charger
A USB charger and battery-holder circuit for a single LiFePO4 cell, supplying a load directly from the cell.
Open source · CC BY-SA 4.0 LTC3588 Energy Harvester
Collect intermittent piezoelectric or DC energy into a capacitor and release it through a selectable-voltage buck output.
Open source · CC BY-SA 3.0 MPM3610 3.3 V Buck Supply
A compact step-down supply with an integrated inductor and an enable input for powering 3.3 V circuits.
Open source · CC BY-SA 3.0 PowerBoost 1000C
A battery charger and boost supply that keeps a portable project powered while a single-cell lithium battery recharges.
Open source · CC BY-SA 4.0 Sunny Buddy Solar Charger
Charge a single-cell LiPo battery through an LT3652 switching converter with an adjustable solar input-voltage setpoint.
Open source · CC BY-SA 3.0 USB-C PD Voltage Selector
Request a supported voltage from a USB-C Power Delivery supply using DIP switches or I2C commands.
Open source · CC BY-SA 3.0 VERTER 5 V Buck-Boost
Generate a 5 V supply from a battery input that can be below or above 5 V.
Browse these projects in the 3D PCB project directory. Open-source rows can be shallow-cloned into the git bucket. Generated board renders belong on the artifact CDN, not in git. See the hardware repository guide.