Smoked resistors

darkfenriz · 29th April 2006, 12:07 PM

Hi
I have a stupid question
If several 1/8W resistors got smoking for several seconds due to failure in circuit, but still measure the same resitance is it save to keep them in circuit or a change is absolutely mandatory?

regards
Adam

pinkmouse · 29th April 2006, 12:24 PM

I would swap them out. They will have been stressed, and may well fail at any time. After all, they are not very expensive, so you might as well do it while you have the circuit open.

lndm · 29th April 2006, 12:38 PM

I agree with Pinkmouse but, since I think you're asking more than that, I can't help but feel that the resistance measurement acts as evidence towards the integrity of the resistor. Under some circumstances I would continue to use them.

One concern however, the casing may now be breached and this may promote a potential future breakdown.

Nigel Goodwin · 29th April 2006, 12:57 PM

Quote:

Originally posted by darkfenriz
Hi
I have a stupid question
If several 1/8W resistors got smoking for several seconds due to failure in circuit, but still measure the same resitance is it save to keep them in circuit or a change is absolutely mandatory?

To be honest, I wouldn't have even measured them! - I would have changed them with out ever bothering.

darkfenriz · 30th April 2006, 07:09 PM

Thank you all
These resistors seem to do they job now, circuit works ok, but i will replace them as soon as I have some spare time. Yes, not wirthy hazarding circuit, that relies on two 'undead' resistors.

cheers

29th April 2006, 12:07 PM	#1
darkfenriz diyAudio Member Join Date: Jun 2004 Location: Warsaw	Smoked resistors Hi I have a stupid question If several 1/8W resistors got smoking for several seconds due to failure in circuit, but still measure the same resitance is it save to keep them in circuit or a change is absolutely mandatory? regards Adam

29th April 2006, 12:24 PM	#2
pinkmouse diyAudio Moderator Join Date: Apr 2002 Location: Chatham, England	I would swap them out. They will have been stressed, and may well fail at any time. After all, they are not very expensive, so you might as well do it while you have the circuit open. __________________ Al I conceive of nothing, in religion, science or philosophy, that is more than the proper thing to wear, for a while. Charles Fort

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29th April 2006, 12:38 PM	#3
lndm diyAudio Member Join Date: Mar 2006 Location: nsw	I agree with Pinkmouse but, since I think you're asking more than that, I can't help but feel that the resistance measurement acts as evidence towards the integrity of the resistor. Under some circumstances I would continue to use them. One concern however, the casing may now be breached and this may promote a potential future breakdown.

30th April 2006, 07:09 PM	#5
darkfenriz diyAudio Member Join Date: Jun 2004 Location: Warsaw	Thank you all These resistors seem to do they job now, circuit works ok, but i will replace them as soon as I have some spare time. Yes, not wirthy hazarding circuit, that relies on two 'undead' resistors. cheers

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