I've been able to build these little virtual machines myself when building electrical and electronic projects like my 4 x 5 ft 4kW CNC router, my 13cm and 23cm transverters and nice little portable reference oscillators with GPS But in any case, a little repetitive circuits like these VR modules are nice, easy to have on hand via plug and play, and as long as the price is decent why not use them. However, I'm starting to see a lot of greed among sellers with their apparently inflated shipping costs. I don't allow myself to buy more than I do. :{)
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