Replacing Caps

[angelshamshel]

Any comments on replacing ESR caps with higher voltage and temperature
ratings than the originals, as long as they install properly?

 

[Dave]

Thanks Jerry and good point about the saturation point and sounds
valid....TIA

On Tue, 9 Sep 2003 10:00:14 -0400, "Jerry G." <jerryg@total.net>
wrote:

Using a higher voltage and temperature rating will make the cap last
longer.

This is a theory that I have heard, but I don't particularly buy it. I
have exceeded this theory, and had no problems:
It is better however to have at least a 50% saturation of the cap. This
means using a cap of more than double the voltage rating required, may
make it not function as well, because it may not be saturated properly.

 

[Asimov]

"Jerry G." bravely wrote to "All" (09 Sep 03 10:00:14)
--- on the heady topic of "Re: Replacing Caps"

I always heard of using electros with 70% to 80% of their rated voltage.
Outside of this range one can take issue on a variety of points. For
example higher voltage caps tend to have higher ESR. Higher temperature
caps also tend to have higher ESR. Higher voltage means a physically
bigger cap with more self inductance, etc... If a circuit is designed
for a specific number of specs it may turn out one of them is critical.
That's not to say in a majority of cases a higher voltage, higher
temperature cap won't work right or even better but the possibility
exists, so it's up to your judgement.


JG> From: "Jerry G." <jerryg@total.net>

JG> Using a higher voltage and temperature rating will make the cap last
JG> longer.

JG> This is a theory that I have heard, but I don't particularly buy it. I
JG> have exceeded this theory, and had no problems:
JG> It is better however to have at least a 50% saturation of the cap.
JG> This means using a cap of more than double the voltage rating required,
JG> may make it not function as well, because it may not be saturated
JG> properly.
JG> --

JG> Greetings,

JG> Jerry Greenberg GLG Technologies GLG
JG> ==============================================
JG> WebPage http://www.zoom-one.com
JG> Electronics http://www.zoom-one.com/electron.htm
JG> Instruments http://www.zoom-one.com/glgtech.htm
JG> ==============================================
JG> "angelshamshel" <angelshamshel@removethishotmail.com> wrote in message
JG> news:tglrlvg35h54knrknicflph8rt02q5pa3k@4ax.com...
JG> Any comments on replacing ESR caps with higher voltage and temperature
JG> ratings than the originals, as long as they install properly?


.... Which sparks some mnemonic circuitry.

 

[Sam Goldwasser]

"Jerry G." <jerryg@total.net> writes:

Using a higher voltage and temperature rating will make the cap last
longer.

This is a theory that I have heard, but I don't particularly buy it. I
have exceeded this theory, and had no problems:
It is better however to have at least a 50% saturation of the cap. This
means using a cap of more than double the voltage rating required, may
make it not function as well, because it may not be saturated properly.

Also note that higher temp caps often have a slightly higher ESR.

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