DC/DC 3.5-30V to 4.0-30V Booster Converter Step Up Voltage Regulator LM2587
This does as advertised. Very sturdy too. Well secured parts, thick board.<br /><br />The trim pot (for mine anyway) was set at the high end of the spectrum. I generally use this for a 5V output and it was set to put out the 30V by default. The trim pot is VERY sensitive. It took me a couple of minutes to turn it enough to get it down to my desired voltage. This isn't a bad thing, it means the voltage can be set very precisely. Just a hassle initially is all.