FNIRSI DMT-99 Intelligent Digital Multimeter

Testing some ultra efficient LED lamps made by Emos. They're in the new EU efficiency class A. Opening one of them and reverse engineering the schematic of the power supply. How does a buck regulator work. Oscilloscope waveforms, voltage and current measurements. The 3.8W LED was about 3 USD and the 7.2W LED was about 5 USD. The DMT-99 multimeter: https://www.fnirsi.com/products/dmt-99?sca_ref=9216013.ntkg5GeG0R&utm_source=af&utm_medium=ref&utm_campaign=9216013 The 2-channel 180MHz oscilloscope: https://www.fnirsi.com/products/dpox180h?sca_ref=9216013.ntkg5GeG0R&utm_source=af&utm_medium=ref&utm_campaign=9216013 The 3.8W LED on my website: https://danyk.cz/reverz50_en.html Please support my channel on Patreon: https://www.patreon.com/DiodeGoneWild Instagram: https://www.instagram.com/savage_danyk/