DROK Micro Boost Voltage Converter DC 4.8~35V to DC ?15V Positive Negative Dual Volt Output Non-isolated Module 660mA Power Regulator Step Up Volts Transformer Board

This buck converter works great i

I needed a reliable and stable 5V voltage source to power an Arduino board and some small electronics on my truck. This was a cost-effective solution, taking my ~12V truck voltage and converting it to 5.0V. It's a good form factor, operates efficiently and dissipates minimal heat. I'm quite pleased with it.

It seems to be a well-built unit and it worked. But, be aware that it requires numerous external components to function properly and the power output de-rates when using a 5V input. See the photo of the application notes which came with the unit.

This is a really neat module. Performs as advertised. Operates and buck or boost over wide range, providers ground-referenced +/- 15 vdc. Remarkably low ripple at the output, better than my cheap Chinese variable supply with current limit. The controller chip labeling has been scraped off, but probing the switch pins it's clearly a flyback regulator similar to LM2587 (different pinouts) attached to a transformer. It requires a minimum load of 30 mA, and with 1/2 watt resistors they still reach 70 decrees C... BE CAREFUL! Update: I was working on an op-amp project and my cheap adjustable supply blew a capacitor, got 2 volts ripple on the output. I took this DROK module and fed it with 2x 18650 batteries and was back in business! +-15 volts from 2x18650s, love it!

I needed +/-15V for a dual supply op amp Arduino shield. Connected this to the VIN pin on the Arduino headers and now I have the voltages. Very quick easy. But then I went to mount this board on an Arduino protoshield and found out that the headers just don't line up with the holes. Looks like they are maybe off by 0.05". You make it fit and it is fine, but it looks weirdly skewed. Hmmm.... Anyway, does work and otherwise seems great.