Need help with tantalum cap replacement
- Thread starter z-adamson
- Start date
1.5µf/35vdc
Check the available space for ease of placement.
https://www.mouser.com/ProductDetail/WIMA/MKS2B041501E00KO00?qs=sGAEpiMZZMv1cc3ydrPrF7l45uRd9dVhVo3J3qGBUAc=
Check the available space for ease of placement.
https://www.mouser.com/ProductDetail/WIMA/MKS2B041501E00KO00?qs=sGAEpiMZZMv1cc3ydrPrF7l45uRd9dVhVo3J3qGBUAc=
Or....
https://www.mouser.com/Passive-Comp...d/_/N-75hr3Z1yzvvqx?P=1z0wqtrZ1z0z7l5Z1yx4atv
Personally I'd go with a film cap.
https://www.mouser.com/Passive-Comp...d/_/N-75hr3Z1yzvvqx?P=1z0wqtrZ1z0z7l5Z1yx4atv
Personally I'd go with a film cap.
Champco
Super Member
Doesnt the + sign mean they are polarized??
Yes it does..
Soundphile
Active Member
The original electro cap is polarized. But if you replace with a film cap, you can install it either way. That means, the polarity does not matter with a film cap. If space allows it, you may replace polarized or unpolarized electro caps of up to 10uF with similar value film caps. IMHO, this improves the sound quality rather noticably.
fernarias
Super Member
ESR is very bad, very bad Mr. particleman7.
Changing capacitance in the audio path is very bad, very bad Mr. particleman7.
That sounds like a very confused and complicated approach to such a straightforward issue.
I guess I'm confused then. I just measured the ESR on a 6.8uf 35V dipped tant it came out to about 1 on my ESR meter. Then I measured a 6.8uf 35V aluminum can it came out at about 2.8 Now go ahead and replace 25 of those dipped tants with 1 ESR with 25 aluminum cans with close to 3 ESR. What do you have?That sounds like a very confused and complicated approach to such a straightforward issue.
Is the circuit with the Tantalums in it designed with low ESR being a critical parameter? - I assume you mean '1Ω ESR'.
If the answer to the above (first) question is 'yes' - then just put in a replacement tantalum if it is faulty, otherwise leave it alone?
If the circuit voltage is substantially less then 35V, the tant was properly derated. They have no aging mechanism, so you could make an argument to just leave it in there. Tantalums have two claims to fame. First is a very predictable "medium" ESR. That's important in some regulator circuits where too low causes oscillation and too high reduces their effectiveness. The other claim to fame is a lot of capacitance in a small volume, but modern aluminum electrolytics have pretty much eliminated that advantage. I replace tantalums in the signal path because I think they can affect the sound. I replace them if they aren't well derated or if they have a history of failure in a certain unit. I also replace them if they're in a power supply location that isn't current limited, because if they fail, they'll fail short circuited.
Years ago tantalum capacitors were thought to not need derating . Thats why many manufacturers placed 16V caps on a 15V line. If you notice in my original comment I was taking about replacing tantalum with aluminum electrolytic. Are you going to pay $70 for a wet tantalum? Im not. I just replaced several corroded wet tants in a tektronix 453 with aluminum electros. Should I have spent $600 in caps?
I think you'll only find wet tantalums in military gear and test equipment. They didn't used to cost an arm and a leg, just a nose or toe, but I was shocked to see the current prices. I've no idea what claim to fame is given to wet slug tantalums, nor do I know if they have the same derating issues as the dry type. I do know they're available in much higher voltages than dry. Anyway, I certainly wouldn't pay for one. Between playing with values and selecting different types (series) of aluminum electrolyics you should be able to satisfy about any application. I also use the trick of adding a short piece of constantan or manganin wire if I need just a bit more resistance to stabilize a circuit. If messing about with regulators, this is worth knowing- https://electrooptical.net/static/oldsite/www/sed/ErrolDietzRegulatorNoisePeaks.pdf
As I've elsewhere written, I suggest not using tantalum capacitors as this is not a socially responsible material to use.
Tantalum is a conflict mineral which funds civil wars, warlords, and horrific brutality, slavery, rape, mutilation, and murder.
Here are few links I pulled using google:
Tantalum is fungible, and thus cannot be easily tracked back to a source. Many companies deliberately lie about the sources because who wants to use materials which are cruelty in solid form.
We have access to capacitors not built on human suffering. Better to use those.
Tantalum is a conflict mineral which funds civil wars, warlords, and horrific brutality, slavery, rape, mutilation, and murder.
Here are few links I pulled using google:
https://www.theatlantic.com/interna...cell-phone-fueling-civil-war-in-congo/241663/
https://www.techrepublic.com/article/how-conflict-minerals-funded-a-war-that-killed-millions/
http://www.newsweek.com/2015/02/13/where-apple-gets-tantalum-your-iphone-304351.html
http://ngm.nationalgeographic.com/2013/10/conflict-minerals/bleasdale-photography
https://www.techrepublic.com/article/how-conflict-minerals-funded-a-war-that-killed-millions/
http://www.newsweek.com/2015/02/13/where-apple-gets-tantalum-your-iphone-304351.html
http://ngm.nationalgeographic.com/2013/10/conflict-minerals/bleasdale-photography
Tantalum is fungible, and thus cannot be easily tracked back to a source. Many companies deliberately lie about the sources because who wants to use materials which are cruelty in solid form.
We have access to capacitors not built on human suffering. Better to use those.
Tantalum and Cobalt are conflict minerals which means wars are fought to control the supply and the profits therefrom.
Manufacturers of dense electronics (primarily cellphones) are finding replacements. Why would you disparage the efforts of those trying to reduce the incentive for civil wars fought over minerals?
Alternatives to tantalum exist which are conflict free. Why not use them?
