300W x 2 TAS5630 dual channel Class D Digital Amplifier board HIFI +AD827 PREAMP
Feb 20, 2020
Best bang for buck
While this is among the best audio amps for the price, actually getting my hands on 4 of them for my 7.1 PC build (the amp is going inside the PC case) is proving difficult since ALL are in China that's in the middle of a plague atm. 0 for 3 attempts in the past 4 months (all refunded, at least I wasn't totally ripped off), getting annoying.
XL4015 /4-USB Port DC-DC 12V/24V to 5V 5A Buck Converter Power Supply Step Down
Nov 20, 2019
Couldn't be happier for the price.
Using it for a 3S 100AH external battery for my phone, converting 8.25v-12.6v from a BMS to 5.25v for a female USB port. Tested it with a 2A electronic USB load, it's about 90% efficient and still 5.15v, very little drop and only gets warm even after 49 hours (the time it took to test the AH rating of the whole thing overall). Pretty sure the switches are just silicon but if they were gallium nitrides the efficiency could get to between 96-99%, but then it would probably be around $20.