Reply To: Why is 12V power on Mayfly V1.1 (rev A) nominally only 11.3V?

In 2021, there was one small production run of the Mayfly v1.1 RevA boards that, due to an error by the manufacturer, used an incorrect resistor value for the 12-volt boost circuit, resulting in a lower output voltage, around 11.3v.  This was corrected in the next manufacturing run, along with making a few other changes, which is why the v1.1 RevB version came out in early 2022.  There were notes on the product websites (here and Amazon) at the time the RevA boards were for sale, stating that the 12v output was lower than ideal.  We also designed and built the 12-volt Boost Screw Terminal Grove Adapter at that time so that people could use that to generate a proper 12-volt supply for sensors that might be sensitive to the 11.3v directly from the board.  It’s also useful for people who still have a Mayfly 0.5v or earlier version, allowing them to generate 12v (or 9v) because those older boards only had onboard 3v and 5v output.   Any of the v1.1 RevB boards that have been available since mid-2022 generate the proper voltage with the onboard 12v boost circuitry.