For instance, over on the Hackaday Discord server, someone has built a WUSB3801 circuit which limits a Li-ion charger’s current based on whether the USB-C port connected can provide 3 amps or not.

Here is a simple USB FM transmitter that could be used to play audio files from an MP3 player or computer on a standard VHF FM radio by connecting it to an USB port. The circuit use no coils that have ...

Every PC has a USB (UniversalSerial Bus) port that can supply5V±5% at 500 mA for peripherals. PoweredUSB hubs also provide this power.You can use a USB port to power an externalcircuit, which is ...