Inside the Siglent SPD3303X Precision Programmable DC Lab Power Supply.
UPDATE: There is an even cheaper version, the SPD3303X-E which has 10mV/10mA resolution.
Atten PSU teardown video.
Rigol DP832 teardown video.
Forum HERE
Podcast: Download
The ultimate beginners guide to multimeters. What are they, how to choose one, and how …