Page 1 of 2

ESP8266-01 power up

PostPosted: Tue Aug 02, 2022 2:57 pm
by babaiem1378
Hello everyone. I want to power up my ESP8266-01 with a Transformerless Power Supply that called Capacitive Power Supply. Circuit diagram of this power supply is shown in figure below also components I used in this circuit are a polyester capacitor 4.7uF 400Volt, a 1M ohm resistor 2Watt, a bridge rectifier, an Electrolyte capacitor 470uF 50Volt, a zener diode 5.1volt 5Watt, a 3.3Volt regulator(AMS1117).
First I plugged in power supply everything is okay but after my ESP8266-01 boot and connect to Wi-Fi its current is reduced and as a result, residual current generated by power supply passes through the zener diode. It makes the zener diode so hot that it cannot be touched. after a while zener diode is burned and overvoltage damaged my ESP8266-01. I am looking for a solution for this problem...
Because of this problem I burned 9 number ESP8266-01 :( :( :( So I beg you to help me please.

Re: ESP8266-01 power up

PostPosted: Wed Aug 03, 2022 5:50 am
by rooppoorali
I do not see this design fit for ESP8266. Because ESP-01 needs 3.3V regulated voltage.

Re: ESP8266-01 power up

PostPosted: Sat Feb 25, 2023 8:57 pm
by oswe
why burnt 9 devices? on the 1st one you could have bought a simply cell charger... which is 5v then you can reduce with 2 diodes in series for example 1Ampere diodes....or you could use regulator to 3v3....

Re: ESP8266-01 power up

PostPosted: Sun Feb 26, 2023 7:28 am
by AcmeUK
@rooppoorali says:-
I do not see this design fit for ESP8266

I agree
It is not mains isolated, and the originators target was to supply a total power consumption less than 50mA at 5V.
That is just not adequate for the ESP8266.