Testing the 111701, a cheap DC-DC booster module for Arduino


The 111701 is a DC-DC switching booster module that can handle an input between 1 and 5V, and has a fixed output of 5V. It can be found on dx.com and it is the cheapest switching module of its kind I could find, currently priced at 1.47€. Unfortunately I couldn’t find any docs about this module, so here is some of my tests.

The first thing to know about this module is: never reverse the polarity. Things get really hot really fast.

Some specs I gathered:

  • Size: 2.6 cm x 1.8 cm x 0.6 cm
  • Input: 1-5V
  • Output: 5-5.36V (see below)
  • Max output current: rated for 600mA (unconfirmed, maximum I got is 420mA for now)

The board also has two screw mounts, not sure about the size (surely less than 3mm, probably 2.5mm). The screws are meant to mount a female USB connector. The board also offers D+ and D- pins for USB purposes; they aren’t wired to anything.

By using 4xAA batteries I measured an input voltage of 5.15V and an output of 5.36V. This might not be a problem depending on your need. Using a single AA battery (input 1.24V) yields a perfect 5.00V. Below is a chart of the input/output voltage I measured.


  • Steven Knott

    How long does a single AA battery last pushing 5 V?

    • vulcant

      It would depend on how much current is drawn from the battery. This is the current that powers the converter and whatever is on the other end of the converter. You can check the manufacturer typically to see how long a battery of theirs will last versus continuous
      output current

  • Sparr Risher

    It would be helpful if you feed it 1x 2x 3x 4x AA and measure the output voltage with different amounts of load. Most cheap regulators fare poorly under changing load.

  • Han Solo

    So much nasty RFI does it pollute the spectrum with?