Characterising the performance and efficiency of the $25 [DPS3003](https://www.aliexpress.com/store/product/RD-DPS3003-Constant-Voltage-current-Step-down-Programmable-Power-Supply-module-buck-Voltage-converter-color-LCD/923042_32685187020.html) 30V 3A lab power supply module from RDtech.  
Includes a how-to on measuring DC-DC converter efficiency graphs, with module power loss on the secondary Y axis.

XL7005 [datasheet](http://www.xlsemi.com/datasheet/XL7005A%20datasheet-English.pdf)

Forum [HERE](http://www.eevblog.com/forum/blog/eevblog-1031-$25-dps3003-psu-module-characterisation/)

Podcast: [Download](http://www.eevblog.org/video/EEVblog1031-DPS3003-PSU-Measurements-1920x1080.mp4 "Download")