9Vステップアップ電圧レギュレータU3V12F9

Great price, fast shipping, works perfectly with my Teensy to step up the voltage. No problems thus far, would recommend.

Does exactly what it’s supposed to, perfect!

Using these with 4x AAA batteries to deliver about 500mA to a device. Gets hot but that's to be expected. Note that using fewer than 4 AA/A cells keeps it from being able to deliver that kind of output power.

Produce a steady 9V from lower voltage source like lipo battery pack. Low price and low current drain when idle makes it a good product. Note that closer to 9V the input, the closer to 1400mA you will have on the output.