Controlling your World the Easy Way

I have fried 2 of my PSU2-3.3 and not sure why. I am supplying 12.5V to the PSU2 from a battery, and using it to power a WEMOS D1 Mini by the 3.3V pin. The first PSU2 worked for 2 power ups, then fried and also destroyed the WEMOS D1 mini. The second PSU2 worked only on the first power up, then frie...

I have purchased several of the PSU2-3.3 and plan to power ESP8266's in auto battery monitors, mainly during long term storage. What is the quiescent current? Since there is risk of destroying the PSU2-3.3 with spikes over 17V, I plan to install a series protection resistor of maybe 15ohms to a 15V ...