Questions tagged [failure]
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198 questions
0 votes
0 answers
76 views
Root cause for failed UART interface on SBC
I could use some help troubleshooting an SBC (KSTR-SAMA5D27) that will no longer communicate via some of its UART pins and what could be root cause, so I can prevent future failures. As part of a ...
- 517
0 votes
1 answer
129 views
Why did this simple lead-acid battery charger fail?
The following schematic shows the simple circuit of an LED lantern. One day somebody connects it to the mains supply in order to recharge the battery after several months, but hears a loud sound! The ...
- 1,146
0 votes
2 answers
240 views
Why is the Relay "Chattering"?
I have this circuit which measures if there is under/over voltage from the AC mains voltage and it consist of two parts: Part one: measuring the input voltage (I had it cropped because it is not the ...
3 votes
5 answers
268 views
MOSFET keeps detonating
I am building a power switch for rocketry usage. On the outside of the rocket is what we call a screw switch. I am not comfortable with all the current running through the screw switch, so I built a ...
- 31
0 votes
0 answers
73 views
PCBA corrosion voltage dependence
Let’s say a PCBA is located in a humid environment where condensation can occur in a worst-case scenario. Parts of the PCBA are low voltage circuitry and parts are high voltage, let’s say we have 3.3V ...
0 votes
2 answers
1k views
ESP32 TWAI/CANBus bus errors cause bus off state
I have multiple devices using ESP32-WROOM-32E and TWAI (CAN). There was an issue where they would have bus errors and then fail to recover via twai_initiate_recovery(). I solved the recovery issue by ...
- 27
12 votes
8 answers
2k views
Detecting stalled AC fan in high-temperature system
The problem: AC 230 VAC fans in a system rated to 100 °C need to be monitored for failure. There is no third wire, just the L and N leads. None of the potential solutions seem good. For example: ...
- 14.4k
3 votes
1 answer
225 views
USB hotplugging causes latchup in LDO
I am working on a device that is powered from a USB host and has a downstream-facing USB type A receptacle. VBUS on the downstream port is connected directly to VBUS on the upstream port, and 3.3V ...
- 31