capacitors and bateries

[John Robert]

I was wondering ... is it completely necessary to position a capacitor in between a DC power supply and a battery you're trying to charge?

Also, how do capacitors affect amps?

Thanks, in advance, for your help!

[TJ]

As far as my knowledge, putting a capacitor smothens the dc input to
the battery..
If your battery is lead-acid based, it's better to have pulsatating
dc, tat is a capacitor which has a lower value to reduce time
constant..

Putting a capacitor reduces the peak current flow into the battery..

Hope i answered atleast a tiny bit..

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[raphael]

inside of /var/log I have over 20 GB tied up in some sort of log files.
messages, messages.1, kern.log, kern.log.1, syslog, syslog.1, and a
bunch of other smaller ones. Can I delete them? Why are my log files so
huge?

[raphael]

Shit! I hijacked the thread again. Sorry!

Anyway, still wondering about below.

[Glen Duncan]

On Mar 26, 2011 8:43 PM, "raphael" <rap...@teuthis.com> wrote:
>
> Shit! I hijacked the thread again. Sorry!
>
> Anyway, still wondering about below.
>
>
> On 03/26/2011 08:34 PM, raphael wrote:
>>
>> inside of /var/log I have over 20 GB tied up in some sort of log files.
>> messages, messages.1, kern.log, kern.log.1, syslog, syslog.1, and a
>> bunch of other smaller ones. Can I delete them?

Yes. Then issue "/etc/init.d/syslog restart" (your distro may vary)

>>Why are my log files so huge?

Genetics? Try reading them. They tell things about your system.

You may also want to tune your syslogd.conf and log rotate policy if what the logs say is of no concern.

-spec

[Matt Joyce]

man logrotate

There are configurations you can set for this.  The one you might want to do is gzip the rotated logs.  That will massively reduce use.

[raphael]

That implies that it rotates out files with numbers at the end, right?
These are single files that re 5GB each. No number at the end. Does the
log rotator deal with that too?

On 03/26/2011 09:08 PM, Matt Joyce wrote:
> man logrotate
>
> There are configurations you can set for this. The one you might want
> to do is gzip the rotated logs. That will massively reduce use.
>
> On Sat, Mar 26, 2011 at 5:43 PM, raphael <rap...@teuthis.com
> <mailto:rap...@teuthis.com>> wrote:
>
> Shit! I hijacked the thread again. Sorry!
>
> Anyway, still wondering about below.
>
>
> On 03/26/2011 08:34 PM, raphael wrote:
>
> inside of /var/log I have over 20 GB tied up in some sort of log
> files.
> messages, messages.1, kern.log, kern.log.1, syslog, syslog.1, and a
> bunch of other smaller ones. Can I delete them? Why are my log
> files so
> huge?
>
>
>
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[Eugene Ventimiglia]

Logrotate copies logfile.n to logfile.n+1 and logfile to logfile.1 you can also configure how many old ones to keep, and when to rotate (by size or time period) man pages can be quite terse, so google "logrotate howto" and you'll find quite a few examples

[Glen Duncan]

On Mar 26, 2011 9:12 PM, "raphael" <rap...@teuthis.com> wrote:
>

> That implies that it rotates out files with numbers at the end, right? These are single files that re 5GB each. No number at the end. Does the log rotator deal with that too?

Syslog specifies the log size. Logrotate controls how many remain in history.

If you dont have multiple numbered copies, you're not likely running log rotate.

-spec

[George Bishop]

Long time lurker... I thought I would give you my $.02.

No, I don't think you need capacitors in that situation. Usually
they're only used to reduce ripple to sensitive components. I would
however put some sort of charge controller between the DC power supply
and battery so you don't cause a fire.

Capacitors only affect the amp draw at startup, known as inrush
current. After they're charged to the voltage they're placed across
they won't draw any net amps.

-George

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[Kevin Anthony]

that depends alot on your DC power supply. it's it's just a
transformer and bridge rectifier, then you defiantly do, otherwise
your power will fluctuate. where V is your peak voltage comming out of
the transformer, and DeltaT is the AC frequency in hertz, your DC
power supply will look like ABSVAL( V*sin(DeltaT)). the capacitors
will smooth it out, and give you a much faster charge. also depending
on the battery, pulsing power to the battery can damage it.

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Kevin Anthony
www.NoSideRacing.com