| Electronics > Repair |
| Help identifying power rating of THT Carbon Resistors |
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| danielbriggs:
Hi all, I wondered if I could get a quick opinion of what power rating these old carbon resistors are? I'm repairing an old board, mid-90's era, and I've not used this sort of high power old carbon resistor before so difficult for me to gauge. I know they're 22Ω, 5%; all connected in parallel. They measure 17.5mm long, and 8mm in dia. Would anyone hazard a guess at what possible power rating something in this size package of that era would likely be? I'm tempted to put these 3W ones in, but just thought I'd check in with the collective-experts, if I'm way off. Can't harm to up-rate them, eh? :-/O https://uk.farnell.com/bourns/w3m22r0j/res-22r-5-3w-axial-wirewound/dp/2530207 Unfortunately I have no way to know the design spec of the rated current for this PCB. Thanks in advance! Dan |
| McMax:
I think you're good to go with the 3 watts you linked, but you can fit the 5Watts of the same series. At the end resistor are dissipating heat and it's just a matter of thermal mass, the bigger, the better ;) |
| fzabkar:
Take care with wirewound resistors. Your application may not tolerate the standard inductive types. https://4donline.ihs.com/images/VipMasterIC/IC/BOUR/BOUR-S-A0008961256/BOUR-S-A0008961256-1.pdf?hkey=6D3A4C79FDBF58556ACFDE234799DDF0 --- Quote ---Non-inductive version is available upon request --- End quote --- |
| George Edmonds:
Hi A better question to ask is why have have four out of five burnt up and fifth has not? G Edmonds |
| TERRA Operative:
Yeah, I'd be figuring out why they burnt first. Then when replacing them, space them a few millimeters off the PCB for good airflow for good measure. |
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