I recently ordered a few esp8266-12F on ebay. I also ordered breakout pcb's. I soldered the first two on the PCB and was able to program them en use them briefly. Then I discovered that I had blown them up with 5v. I have been using them with 3.3v ever since. But I am only able to use one out of the ten I bought. I hand soldered most of them but I also used my brothers infrared soldering oven to solder the last 4 I had. They don't work either. When I put them on a breadboard and connect them to my 3.3v breadboard power supply, the power supply led bliks and the voltage regulators get really hot. They seem to be dead out of the box. Can it be that they didnt like the soldering oven? Did I have a bad batch? Does anybody have a clue what can be wrong.
This is the only one I have working at the moment. I use it with the breadboard psu in the picture below. The PSY is set to 5v and the esp8266 in this picture has a HT7333 underneath.
This is the breadboard psu I am using.
These were soldered using a infrared soldering oven. I used the above breadboard psu set to 3,3v to test them. I tested them by simply touching the vcc and gnd holes with wires from the psu. As soon as I did that the regulator on the PSU got very hot and the led flashed.
btw, I screwed up the links to the images. i have no idea how to fix it.