ESP8266 Community Forum

Cheapest and best I have seen so far is .

I personally have used these in several of my projects.

http://www.ebay.com/itm/1A-Wireless-Rem ... 20f4892474


One of the project I have used them in.
http://www.smbisoft.com/projects/esp826 ... tate-relay

RogerClark wrote:Each device is different.

Not all of them just have a zener, but the cheaper ones I have seen, do just have a single zener.

I have sucessufully modified several of them.

The zener is part of a feedback circuit which controls the HT side of the PSU, its not regulating the LT side like a linear regulator.


BTW. WARNING. dont run it with the zener removed. As without the controlling feedback, you are likely to destroy the PSU.

+1!

What is this compact AC-DC conversion? What is compact here in this ? Is this PCB which is compact here or the components are there which make it compact? Also what type of rating of the input/output they can handle? Are they using by any module?

Leiterplattenbestückung

It is unlikely that the ESP8266 would ever draw a full amp, it would be lucky to spike to 200mA during transmit. I done a lot of testing and have a number of ESP modules running using the tiny SOT liner regulators, they never even get close to getting warm. For a compact power solution you have number of options. On aliexpress and a number of other sites there are various different 240v to 3.3v converters available, but you want to be careful when working with mains.

http://www.aliexpress.com/item/110V-220 ... 74264.html

http://www.aliexpress.com/item/ac-dc-3- ... 5,201409_2

Another solution is to gut a USB wall plug and use a linear or switching 3.3v regulator of some kind to bring it down to 3.3v for the ESP. Most cheap USB adapters even have enough space inside for a regulator and ESP module if you are brave. I will try and post a couple of pictures of modules I have created using different power solutions.