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SOTABEAMS USBP-100 Manual

Electronic load
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Electronic Load
...keeps your battery pack switched on!
USB power packs are readily available and seem just perfect for
powering your low-power USB devices. Unfortunately, many such
packs will switch off if the current being drawn is too low. Our
electronic load allows you to adjust the current draw to just
beyond the point where the load keeps switched on. It's an
efficient and simple way of using your power pack!
Building the
Electronic Load
is easy and fun. It will take about
20 minutes to build and is suitable for a beginner.
Page 1
Power Conditioner
02 March 2017

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Summary of Contents for SOTABEAMS USBP-100

  • Page 1 Electronic Load …keeps your battery pack switched on! USB power packs are readily available and seem just perfect for powering your low-power USB devices. Unfortunately, many such packs will switch off if the current being drawn is too low. Our electronic load allows you to adjust the current draw to just beyond the point where the load keeps switched on.

  • Page 2: Revison History

    USB A female shorter connector USB A male longer connector Heatshrink sleeving - clear looks like a rectangle of clear plastic If anything is missing, just get in touch for help. Richard@sotabeams.co.uk Errata None Page 2 Power Conditioner 02 March 2017...
  • Page 3 Building tips Use a soldering iron with a fine tip (e.g. 1.2mm) and a fine solder (e.g. 0.7mm). All the components are installed on the top side of the board labelled “SOTAbeams”. Use the list above to identify the components.
  • Page 4 Testing Turn R1 (pot) fully anticlockwise. Plug the load (J2) into a USB power pack socket. The LED should light. Plug your intended target device (e.g. WSPRlite) into the USB socket (J1). If the USB power pack powers down after a few minutes (LED on Electronic load goes off), turn R1 slightly clockwise to increase the current being drawn.
  • Page 5 Page 5 Power Conditioner 02 March 2017...

  • Page 6: Fault Finding

    Fault finding The most likely problem on this board is a poor solder joint, Inspect your soldering carefully. If you get stuck, send me an e-mail for help! Richard@sotabeams.co.uk Page 6 Power Conditioner 02 March 2017...