Questions tagged [failure-mode]
The failure-mode tag has no usage guidance.
12
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Burned motor controllers: possible root causes analysis
On a submarine robot we built, during an operation, we recently had 3 defect thruster motors (the internal power PCBs have many burnt components, 2 of the motors cracked open due to internal pressure)....
33
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5
answers
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Why do car blinkers flash at twice the speed when a blinker light has burned out
On my 1999 Ford Escort, the brake lights double as turn signal blinkers. A left brake light burned out recently and my blinkers went much faster than normal when signaling a left turn. This is a ...
9
votes
3
answers
850
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How to turn off an entire circuit when one LED fails (in the event of an open branch)?
I'm wondering how I can have a circuit to turn off in the event that one (or even multiple) LEDs fails, causing an open parallel branch. I would like all the LEDS to turn off in that case. The example ...
0
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1
answer
743
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Form C (SPDT) Relay Failure Modes and Detection
This is a question about the failure modes of an SPDT (i.e. form C) relay. Specifically, I am interested in electromechanical relays for an automotive application. I understand that either contact ...
3
votes
1
answer
184
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Flex Cracking for 0402 MLCCs
Is there any data to show that 0402s are relatively flex crack resistant due to their size?
I can find lots of references about 0805 and larger capacitors cracking due to board flex, but I can't find ...
0
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0
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73
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Does riding the rail fatigue an opamp?
I have an LM7332 that is creating a gate voltage to drive a MOSFET. The circuit failed in the field and I'm trying to debug. One thing I've noticed is that the supply voltage to the MOSFET was ...
1
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1
answer
114
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What is the purpose of Failure Mode and Effect Analysis?
Our embedded controller is Advanced Drive Assist Systems(ADAS). It basically has Two software layers. Application software and low-level software.
Our controller has many low-level functions such as ...
0
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1
answer
114
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Current limiter problem
I am designing the following circuit to limit current inrush to a device on startup (to about 1.5 amps over about 3 seconds). Rload is just for testing, the actual load is a bunch caps at 56v, but I ...
0
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2
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839
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Logic circuit for making sure that only one of several signals are logic-high
simulate this circuit – Schematic created using CircuitLab
I have a circuit as seen in the schematic above. It has 4 different output stages. Each one has an "Enable" pin. The user is able to ...
1
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3
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81
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Why is conduit for 120V building power metallic?
I saw wire conduit being installed in a building, and it was metallic. Wouldn't you want to use an insulating material instead? What if the live wire sheath started to fail? It would short to the ...
3
votes
1
answer
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Strange NTC behaviour: it goes open circuit when cooling down
My partner has a heater for heating wax that is used for waxing legs and other body parts. She told me it stopped working; it does not heat up anymore.
When I opened the device and looked at it I ...
1
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1
answer
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Tools/Methodologies for failure mode effect or fault tree analysis (FMEA/FTA)
We have barely started the process towards medical device certification, and as part of that I am having a hard time wrapping my head around the appropriate way to construct a failure mode effect ...