usb otg cable for an android smartphone
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USB Audio Interface based DAC PCM2902
This weblog discusses electronic circuit schematics, PCB design, DIY kits, and electronic project diagrams. The subject circuit is a quality preamplifier with a built-in USB DAC designed for the Leachamp power amplifier. The schematic is based on the PCM2902 datasheet...
USB Printer Share Switch Circuit Project
This device enables two computers to share a single USB printer or other USB devices such as an external flash drive, memory card reader, or scanner. A rotary switch is used to select the PC that will connect to the...
USB Microphone Line Level Preamp
The computer needs at least 180 millivolts peak-to-peak and the condenser microphone in my headset produces about 20 millivolts peak-to-peak into a 2.2k load with normal speech levels. There are USB ports on the machines, so I can use that...
usb pow
The USB standard limits the current consumption of all USB devices to either 100mA or 500mA, depending on the specifications of the USB hub or host controller (e.g., a computer) supplying the power. Ideally, no USB device should draw more...
how to convert a 9v battery to 3.7v
A regulator circuit is needed for this DIY project. Familiarity with electronic components, circuitry, the use of a multitester, and a soldering iron is essential. The schematic diagram provided can accept an input voltage ranging from 6 to 24 volts...
lf286 Linux USB LCD display with watchdog and buttons
This article is the result of positive feedback on previous hardware articles. Readers of LinuxFocus expressed interest in interfacing with the USB bus. This solution utilizes the LCD display from a May 2002 article and connects it to the USB...
Atari Joystick USB Adaptor
This project implements a composite USB device that supports two USB 2.0 full-speed gameport HID interfaces. The physical joystick ports are wired according to the Atari standard, allowing the connection of most Commodore 64 and Amiga joysticks, as well as...
USB phone charger
A portable phone charger designed for a Siemens mobile phone has been updated to include a printed circuit board (PCB), a USB connector, and enhanced current capabilities. The new charger utilizes a step-up converter based on the TPS61032, which is...
usb cd rom emulation
This project aims to create a USB CD-ROM device. Unlike typical devices that imitate a CD-ROM drive, this project emulates one. The concept allows users to store an ISO image or other types of CD-ROM images on an SD card,...