U know the feeling ?

[tp4tissue]

When you don't have the Right Capacitor..

And you're like..  Ugggghh.. IF ONLY....   1 mm.. just 1 mm smaller


Then you go on the Mouser-internet.. capacitor is $1, shipping is $5


SIGH.............


____________

UPDATE__:

Does anyone know why the leakage is greater for organic polymer capacitors vs standard electrolytic


EDIT:


Does any one get slightly aroused when looking at capacitor data-sheets..

It's like a menu for super-model hostesses...   at least to me it is...


They're all so pretty I don't know which one to pick....

[inanis]

Sadly, I do. 

[beehatch]

You*

[tp4tissue]

Sadly, I do. 

OKOK

Ianis..  I'm doing something SUPER stupid.. Like I think this is mega dumb.


I got this USB3.0 enclosure..

There's a capacitor on it..  It's clearly not good enuff @ 16v 100uF

So What do you think... Yay or Nay for replacement..


My excuse is... I need m0ar reliable-ness.. 

[osi]

lol

[inanis]

Sadly, I do. 

OKOK

Ianis..  I'm doing something SUPER stupid.. Like I think this is mega dumb.


I got this USB3.0 enclosure..

There's a capacitor on it..  It's clearly not good enuff @ 16v 100uF

So What do you think... Yay or Nay for replacement..


My excuse is... I need m0ar reliable-ness.. 

Show Image

Good god, man, if you yourself think it is dumb, then let me assure you, it is dumb.  And you give me a hard time about wanting a new mouse!  :blank:

[tp4tissue]

Sadly, I do. 

OKOK

Ianis..  I'm doing something SUPER stupid.. Like I think this is mega dumb.


I got this USB3.0 enclosure..

There's a capacitor on it..  It's clearly not good enuff @ 16v 100uF

So What do you think... Yay or Nay for replacement..


My excuse is... I need m0ar reliable-ness.. 

Show Image

Good god, man, if you yourself think it is dumb, then let me assure you, it is dumb.  And you give me a hard time about wanting a new mouse!  :blank:

but you wanted a wireless mouse..   That's taboo.. 

A wireless mouse is based on technology made obsolete by Wired mouse-s

#Copper4lyf 

[inanis]

Wireless mice are the best mice for my purposes. I stand by it. Question is can you stand by replacing a capacitor that doesn't need replacing, all while paying 5x more in shipping cost than the cost of the actual capacitor?

Logic tells me I win this round!

[tp4tissue]

Wireless mice are the best mice for my purposes. I stand by it. Question is can you stand by replacing a capacitor that doesn't need replacing, all while paying 5x more in shipping cost than the cost of the actual capacitor?

Logic tells me I win this round!

[tp4tissue]

Does any one get slightly aroused when looking at capacitor data-sheets..

It's like a menu for Supermodel hostesses...   at least to me it is...


They're all so pretty I don't know which one to pick....

[trizkut]

next week, in the obituaries:

"man dies trying to have sex with giant capacitor"

[tp4tissue]

next week, in the obituaries:

"man dies trying to have sex with giant capacitor"

Hahahhahahahahahahahaha


nawhh...   I know my electronix.. even if I were to do this,  which I WOULD NOT, I'd be properly suited and grounded..



Anyone know why these "Audio Grade" sheets don't mention ESR rating ?..

Are they trying to HIDE SOMETHING..

[tp4tissue]

Does anyone know why the leakage is greater for organic polymer capacitors vs standard electrolytic

[BlueNalgene]

Does anyone know why the leakage is greater for organic polymer capacitors vs standard electrolytic

Leakage is based on the electronic properties of the material used.  Leakage current increases as the the dielectric breaks down and produces paths for electrons or holes to travel, which is not what you want with a capacitor.  Electrolytes are remarkably stable (see: rocks).  Organics are more likely to break down and leak the current.  This is supported by the fact that leakage increases with thermal exposure, i.e. the organics are more likely to degrade in heat whereas oxide layers for electrolytic cells are more stable.  Organic polymers in capacitors can also undergo hydrolysis, so any moisture exposure will increase leakage.

[tp4tissue]

Does anyone know why the leakage is greater for organic polymer capacitors vs standard electrolytic

Leakage is based on the electronic properties of the material used.  Leakage current increases as the the dielectric breaks down and produces paths for electrons or holes to travel, which is not what you want with a capacitor.  Electrolytes are remarkably stable (see: rocks).  Organics are more likely to break down and leak the current.  This is supported by the fact that leakage increases with thermal exposure, i.e. the organics are more likely to degrade in heat whereas oxide layers for electrolytic cells are more stable.  Organic polymers in capacitors can also undergo hydrolysis, so any moisture exposure will increase leakage.

Hrrrrmm... awesome info...

Thx blue,  Can you tell from The below pictures,  if that cap is in a position where the circuit would be sensitive to "leakage" current.



My GUESS is that the cap is there to help start up the motor in the harddrive.

This is a 2.5" external enclosure..

But I'm not an EE..


The reason I want to replace this is, The drive I'm going to eventually put in here is a 2TB 2.5" drive,  so I'm a bit worried that this tiny low quality cap might degrade quite fast, with the constant start and stop done in mobile environments.


So,  if you were replacing this cap..  what would you go with .. electrolytic or polymer.

Cost is negligible,  $1.45 for polymer (800uA leakage) vs $ 0.75 for electrolytic (100uA leakage), + $5 shipping.

hahahaha

[BlueNalgene]

Does anyone know why the leakage is greater for organic polymer capacitors vs standard electrolytic

Leakage is based on the electronic properties of the material used.  Leakage current increases as the the dielectric breaks down and produces paths for electrons or holes to travel, which is not what you want with a capacitor.  Electrolytes are remarkably stable (see: rocks).  Organics are more likely to break down and leak the current.  This is supported by the fact that leakage increases with thermal exposure, i.e. the organics are more likely to degrade in heat whereas oxide layers for electrolytic cells are more stable.  Organic polymers in capacitors can also undergo hydrolysis, so any moisture exposure will increase leakage.

Hrrrrmm... awesome info...

Thx blue,  Can you tell from The below pictures,  if that cap is in a position where the circuit would be sensitive to "leakage" current.



My GUESS is that the cap is there to help start up the motor in the harddrive.

This is a 2.5" external enclosure..

But I'm not an EE..


The reason I want to replace this is, The drive I'm putting in here is the 2TB, so I'm a bit worried that this tiny low quality cap might degrade quite fast, with the constant start and stop done in mobile environments.


So,  if you were replacing this cap..  what would you go with .. electrolytic or polymer.

Cost is negligible,  $1.45 for polymer (800uA leakage) vs $ 0.75 for electrolytic (100uA leakage), + $5 shipping.

hahahaha

Show Image

Show Image

I'm a chemist, not an EE.  I can tell you why it works, but I have little ability to impliment it. 

However, I do know the situations to use different caps.
Is it fancy and integral to the design? (MoBo/Graphics Card) -> use polymer
Does it require fast switching? -> use tantalum
Are you pumping ungodly volts through it? -> supersize that mother
Else, use electrolytic for C >1uF and use MLCC for C < 1uF.

So I would vote electrolytic.  Tiny and low quality is probably fine for it.  If it pops like a zit, you'll know it, and it will be an easy fix.  If I am looking at the right part (C25) it is just being used as a decoupling capacitor to prevent noise on that line.  Not a big deal.  If you think the circuit is fast switching, or if you just HAVE to throw money at it, I would try a tantalum capacitor first.

[tp4tissue]

I'm a chemist, not an EE.  I can tell you why it works, but I have little ability to impliment it. 

However, I do know the situations to use different caps.
Is it fancy and integral to the design? (MoBo/Graphics Card) -> use polymer
Does it require fast switching? -> use tantalum
Are you pumping ungodly volts through it? -> supersize that mother
Else, use electrolytic for C >1uF and use MLCC for C < 1uF.

So I would vote electrolytic.  Tiny and low quality is probably fine for it.  If it pops like a zit, you'll know it, and it will be an easy fix.  If I am looking at the right part (C25) it is just being used as a decoupling capacitor to prevent noise on that line.  Not a big deal.  If you think the circuit is fast switching, or if you just HAVE to throw money at it, I would try a tantalum capacitor first.

Hrrrrrmmmm.....

I see...

The ESR characteristic of Tantulum seems to be beaten by Organic polymer..

And I am reading here that Polymer is safer, because there's no burning or exploding.

What do you think of this lil' guy here.



http://www.mouser.com/Search/ProductDetail.aspx?R=870235374006virtualkey51110000virtualkey710-870235374006

[BlueNalgene]

I'm a chemist, not an EE.  I can tell you why it works, but I have little ability to impliment it. 

However, I do know the situations to use different caps.
Is it fancy and integral to the design? (MoBo/Graphics Card) -> use polymer
Does it require fast switching? -> use tantalum
Are you pumping ungodly volts through it? -> supersize that mother
Else, use electrolytic for C >1uF and use MLCC for C < 1uF.

So I would vote electrolytic.  Tiny and low quality is probably fine for it.  If it pops like a zit, you'll know it, and it will be an easy fix.  If I am looking at the right part (C25) it is just being used as a decoupling capacitor to prevent noise on that line.  Not a big deal.  If you think the circuit is fast switching, or if you just HAVE to throw money at it, I would try a tantalum capacitor first.

Hrrrrrmmmm.....

I see...

The ESR characteristic of Tantulum seems to be beaten by Organic polymer..

And I am reading here that Polymer is safer, because there's no burning or exploding.

What do you think of this lil' guy here.



http://www.mouser.com/Search/ProductDetail.aspx?R=870235374006virtualkey51110000virtualkey710-870235374006

If you want it, go for it.  It should work fine.  In my experience, the exploding/fires aren't too awful.  Though I was in a lab when a capacitor for the 3kV generator blew.  They are the size of a coke can, and we all had a nice jump.