Powered USB Hub Help PC Interface

I got a strange problem as i added more and more peripherals, the pc gave odd messages, “i cannot detect what you are doing” and things like that. I almost flipped trying to locate the culprit. The problem was not in any peripheral but in the USB port powering the system itself. The SMPS was not loading much. Certainly the peripherals were drawing more and the warning could have been more like “use your own power”.  Computer Data Interface

Powered USB Hub Help PC Interface

I could not locate a powered USB with any vendor close by, so i built one and it works perfectly, Now it doubles up as a UPS Low Batter Indicator, by rare coincidence. If the Unregulated DC is above 7 volts, then no bugs. When i adjust the unregulated DC to the 7805 to around 6.9V, then i have a advance warning system.

Wireless USB – Wireless Extension to USB

USB Hub with Power

When power fails, i keep working and listening to music from a Flash Thumb drive. When music stops, i turn of computer, the lead acid batteries gone below 20 V DC. This avoids deep discharge of my batteries. The Powered USB gets undetected when the supply falls below 4.5 probably.

  • Electronics Tutorials – Ian Purdie VK2TIPElectronics Tutorials – Ian Purdie VK2TIP
    Offering free comprehensive basic electronics tutorials in amplifiers, antennas, ham radio, filters, oscillators, power supply, receivers, test equipment, transmitters, radio design and electronics design. Links [...]
  • Nuts and Volts DIY Magazine
    Online edition of US print magazine Nuts and Volts. Aimed at the electronics hobbyist, with articles covering amateur radio, cellular communications. Nuts and Volts DIY [...]
  • Triode Electronics Store Online
    Triode Electronics Store Online Electron Tubes & Tube Amplifier Parts.. “Worldwide Service Neighborhood Prices” Since 1985 Online Tube Amp Kits Transformers Tubes Capacitors Dynaco Upgrades [...]
  • Piezoelectric Crystal OscillatorsPiezoelectric Crystal Oscillators
    Crystal Oscillators are the Time Base on a wristwatch or a home clock, analog or digital, Mechanical clocks have become rare due to the Maintenance [...]
  • Supercap and White LED and Energy HarvestersSupercap and White LED and Energy Harvesters
    This is a educative and simple example to help learn about supercaps and white LED. It will also help you understand component behavior. If you [...]
  • Electric bicycle DIY kits – CYCLONE Taiwan
    Manufacturer of electric bike and motorized DIY kit, battery, chargers and accessories. Electric bicycle DIY kits – CYCLONE Taiwan
  • Vacuum Tube-G Pages from Peter
    Some Audio and other Articles/Projects on Vacuum Tubes or Valves. Also he has made Online Calculators .. Bias Tool, Gain Tool and Low crossover cap. [...]
  • Applied Magnetics by Barry Hansen
    Barry Hansen enthusiasm for Coilgun Designs has created an EE education portal. Applied Magnetics by Barry Hansen See the RLC Simulator and Inductor Simulator. By [...]
About delabs 456 Articles
delabs is a web-service for product design and development.

Be the first to comment

Leave a Reply