Warning - dangerous MB-102 breadboard power supply !!

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spachal
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Warning - dangerous MB-102 breadboard power supply !!

#1 Post by spachal » 13 Mar 2018, 14:22

Hi, I just lost two ESP boards, probably thanks my stupidity .. But because it's not complete my fault, here is the warning.

DON'T USE USB port on MB-102, as output!!

A few minutes ago I tried to use MB-102 as power source of my project, because of testing 6 channel relay module and to provide good power source for this module, I used MB-102 with 9V@2A power supply.
This module have also USB female connector, so I decided to use it as power source for my D1 mini boards .. big mistake!!

As I found, the USB connector is connected in parallel with the DC barrel jack, so if you put DC power source into the DC jack, you will have the same voltage in the USB female connector. In the result, instead of regulated 5V voltage there is 9V output and it destroyed my boards immediately..

It's above my understandig how ANY developer could make such desingn mistake.

IF POSSIBLE, please put also this warning to this page: https://www.letscontrolit.com/wiki/index.php/Power

MB102danger.jpg
MB102danger.jpg (128.36 KiB) Viewed 3265 times
Please excuse my English, thanks!

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grovkillen
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Re: Warning - dangerous MB-102 breadboard power supply !!

#2 Post by grovkillen » 13 Mar 2018, 15:14

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krikk
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Re: Warning - dangerous MB-102 breadboard power supply !!

#3 Post by krikk » 28 Apr 2018, 12:03

same issue on my board
20180428_095940513_iOS.jpg
20180428_095940513_iOS.jpg (1.06 MiB) Viewed 3050 times
thanks for the info

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