“I already had a home-built 5V power supply and wanted to make it easier to connect up to range of Arduino microcontrollers and various add-on modules. By including this little DC-DC converter within the box, I was able to branch off a 3.3V supply from the existing 5V. A tantalum capacitor was added on both input and output to minimise the risk of high frequency noise leaking between the two supplies. I used araldite to stick 3 rows of jumper pins onto the top of the box - for ground, 3.3V and 5V. It works perfectly and fixed some problems I was getting with the NRF24L01 module.”
“This thing is tiny! Which is brilliant. Arrived very quickly and works well. Be aware that the EN pin can't be driven low straight from a GPIO to turn off the power if you are using an MCU with 3.3V max pins like an ESP32 does, as it has an on board pull up resister to VIN. Excellent regulator overall and easy to add a couple of very cheap components to get around that problem.”
