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This product is produced in-house by SparkFun.
We are currently planning to build 24 units.

Incoming stock values are estimates, and subject to change without warning.

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Description: This is a very simple board that takes a 4-9V input voltage and outputs a selectable 1.8V or 3.3V regulated voltage. All headers are 0.1" pitch for simple insertion into a breadboard.

Input power can be supplied to either the DC barrel jack or the two pin header labeled + and -. Output power is supplied to the pins labeled GND and VCC. Board has both an On/Off switch and a voltage select switch (3.3V/1.8V).

The two sets of four GND and VCC pins are spaced such that when connected to our Basic Breadboard both power busses will be powered.

Note: Headers are not supplied. You will need to supply your own headers to connect this board to a breadboard. Check below for some breakaway header strips.

Dimensions: 2.15x0.65"


  • 4-9V input voltage via barrel jack or 2-pin header
  • 3.3V or 1.8V regulated output voltage
  • 800mA Operating Current
  • ON/OFF switch
  • Output voltage select switch
  • Power status LED
  • PTC fuse protected power
  • 5.5x2.1mm center positive barrel jack


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Customer Comments

  • This might seem an odd question, but at 4-9V input… Has anyone considered making aversion of this board with a micro-usb input connector? I can’t speak for everyone, but between phones and tablets, i have an excess of micro-usb cables laying around, and im sure I can’t be the only one with nothing to do with them.

  • Good and bad with this thing… The good, it works.. The bad, it takes some slight header bending for it to fit even the sparkfun solderable protoboards (These: The other issue seems to be that the schematic is definately out of date… it’s missing one of the diodes that is on the board (That appears to be for reverse polarity on the output?)…

  • Any specs on how much current or power this can supply? Voltage alone is only half the equation. ;-)

    • The regulator on board is rated to a max of 800mA.

      • Need to be careful here - the 800mA Operating Current listed is misleading if not put into context.

        Only the regulator IC (LD1117) is rated at 800mA. The total amount of current this board can supply is dependent on several factors, most importantly, the total power required (Watts, based on Vin, Vout, Iout), and the ambient temperature.

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