Yet Another Cycling Forum

General Category => The Knowledge => OT Knowledge => Topic started by: Gattopardo on 23 August, 2021, 09:02:58 pm

Title: Can you identify this capaciator?
Post by: Gattopardo on 23 August, 2021, 09:02:58 pm
(https://scontent.flhr4-3.fna.fbcdn.net/v/t39.30808-6/239408674_5092087644151073_4958633942079984184_n.jpg?_nc_cat=104&ccb=1-5&_nc_sid=825194&_nc_ohc=EMDvJ5b3Ao0AX8qMlBq&_nc_ht=scontent.flhr4-3.fna&oh=b70092a29b73351f2e0162f672eb1ab6&oe=6129295A)

Would a 275v  x2 replacement make a difference?
Title: Re: Can you identify this capaciator?
Post by: Pedal Castro on 23 August, 2021, 09:11:09 pm
A 2.2 microfarad 100V capacitor? It's been a while since I did electronics. The J is the  tolerance value.
Title: Re: Can you identify this capaciator?
Post by: Gattopardo on 24 August, 2021, 10:49:31 am
Would replacing that circled capacitor with a 275v or 305v spec capacitor make a difference?

 
Title: Re: Can you identify this capaciator?
Post by: nobby on 24 August, 2021, 11:36:24 am
You need Kim to look in here. :)
Title: Re: Can you identify this capaciator?
Post by: BFC on 24 August, 2021, 11:48:27 am
An upgrade of the voltage rating is normally a good thing to do, as long as the replacement component fits - different leg spacing can be a pain but is relatively easy to sort but be carefull if the board is subject to vibration, the major problem is if the replacement doesn't fit in the available space or severely obstructs airflow.
Title: Re: Can you identify this capaciator?
Post by: grams on 24 August, 2021, 12:18:12 pm
Looks like a polyester box capacitor. Which would make it 2.2 nanofarads rather than micro.
Title: Re: Can you identify this capaciator?
Post by: Paul on 24 August, 2021, 02:37:07 pm
Is that 0.1 more than  flux capacitor?
Title: Re: Can you identify this capaciator?
Post by: Kim on 24 August, 2021, 11:57:35 pm
Quote from: nobby on 24 August, 2021, 11:36:24 am
You need Kim to look in here. :)

Looks like I'm late to the party.  But yes, voltage ratings are a safe maximum, no issue with using a higher one, if it physically fits (higher voltage ratings tend to mean physically larger capacitors).  Using a lower voltage rating is a recipe for magic smoke release.

Class X and Y mean they're safety rated (to withstand voltage surges) for mains applications.  X-rated capacitors usually fail short-circuit, which is appropriate when they're between live and neutral (there's presumably a fuse that can blow to prevent fire).  Y-rated means they're designed to fail open circuit, which is necessary to prevent electric shock risk when they're connected to earth.

Flux capacitors are rated in Jiggawatts, rather than the usual Farads.
Title: Re: Can you identify this capaciator?
Post by: Gattopardo on 25 August, 2021, 12:49:45 pm
Thank you Kim, I thought that the higher voltage would be OK and size is not an issue.  But I now have the Kim fact, bettter than a fact.


Thank you.
Title: Re: Can you identify this capaciator?
Post by: Pingu on 25 August, 2021, 03:19:11 pm
Quote from: Paul on 24 August, 2021, 02:37:07 pm
Is that 0.1 more than  flux capacitor?

Depends on the polarity.