So, here’s a rhetorical question: What voltage/current curve is to reasonably expected from a rated power supply? (Note: I already ranted about a couple of 5V 2A supplies that failed to deliver, hence the “another” in the title.) Your would think that I’d learn by now and shouldn’t be so pissed off when I test a power supply only to find it to deliver just a fraction of its rated performance. Case in point: I just took delivery of a…
I have been playing with a new WiFi module that has recently come onto the market – the ESP8266 Serial WIFI Wireless Transceiver Module – that I found on eBay for about 4ドル. This unit promises a lot and at this price is clearly a bargain if it delivers!
I just received another couple of 5V 2A power supplies from China, purchased through eBay, for 2ドル.70 CDN. Not a bargain, but a good price! As per normal, I tested them to ensure they are useable and was very surprised to find that both were completely sub-standard and unusable. The first had an open-circuit voltage of 4.5V and this fell to 4.0V under less than 1A loading. The second, with an open-circuit voltage of 5.1V, fell to 2.5V under the…