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..
> 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!
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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?
> 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?
On Mar 26, 2011 8:43 PM, "raphael" <raph...@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.
On Sat, Mar 26, 2011 at 5:43 PM, raphael <raph...@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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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?
> 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 <raph...@teuthis.com > <mailto:raph...@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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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 On Mar 26, 2011 9:12 PM, "raphael" <raph...@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?
> 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 <raph...@teuthis.com >> <mailto:raph...@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?
>> -- >> You received this message because you are subscribed to the Google >> Groups "NYCResistor:Microcontrollers" group. >> To post to this group, send email to >> nycresistormicrocontrollers@googlegroups.com >> <mailto:nycresistormicrocontrollers@googlegroups.com>. >> To unsubscribe from this group, send email to >> nycresistormicrocontrollers+unsubscribe@googlegroups.com >> <mailto:nycresistormicrocontrollers%2Bunsubscribe@googlegroups.com>. >> For more options, visit this group at >> http://groups.google.com/group/nycresistormicrocontrollers?hl=en.
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> -- > You received this message because you are subscribed to the Google Groups
>> 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 <raph...@teuthis.com >> <mailto:raph...@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?
>> -- >> You received this message because you are subscribed to the Google >> Groups "NYCResistor:Microcontrollers" group. >> To post to this group, send email to >> nycresistormicrocontrollers@googlegroups.com >> <mailto:nycresistormicrocontrollers@googlegroups.com>.
>> To unsubscribe from this group, send email to >> nycresistormicrocontrollers+unsubscribe@googlegroups.com >> <mailto:nycresistormicrocontrollers%2Bunsubscribe@googlegroups.com>.
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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.
On Sat, Mar 26, 2011 at 1:54 PM, John Robert <j...@hotmail.com> wrote: > 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!
> -- > You received this message because you are subscribed to the Google Groups > "NYCResistor:Microcontrollers" group. > To post to this group, send email to > nycresistormicrocontrollers@googlegroups.com. > To unsubscribe from this group, send email to > nycresistormicrocontrollers+unsubscribe@googlegroups.com. > For more options, visit this group at > http://groups.google.com/group/nycresistormicrocontrollers?hl=en.
Hi every body we have summer boot camp in United Arab Emarets about semiconductor our target is from Gr8 - Gr 12 we look for trainers & experts to train the Students who interesting to work with us This July send the cv to : g...@cka.ae Empower your Business with BlackBerry® and Mobile Solutions from Etisalat
-----Original Message----- From: George Bishop <bishop...@gmail.com> Date: Sat, 26 Mar 2011 22:53:22 To: <nycresistormicrocontrollers@googlegroups.com> Subject: Re: [NYCR:Microcontrollers] capacitors and bateries
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
On Sat, Mar 26, 2011 at 1:54 PM, John Robert <j...@hotmail.com> wrote: > 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!
> -- > You received this message because you are subscribed to the Google Groups > "NYCResistor:Microcontrollers" group. > To post to this group, send email to > nycresistormicrocontrollers@googlegroups.com. > To unsubscribe from this group, send email to > nycresistormicrocontrollers+unsubscribe@googlegroups.com. > For more options, visit this group at > http://groups.google.com/group/nycresistormicrocontrollers?hl=en.
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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.
On Mon, Mar 28, 2011 at 12:33 PM, Sumaya Robin Andy
<sumaa...@hotmail.com> wrote: > Hi every body we have summer boot camp in United Arab Emarets about semiconductor our target is from Gr8 - Gr 12 we look for trainers & experts to train the Students who interesting to work with us This July send the cv to : g...@cka.ae > Empower your Business with BlackBerry® and Mobile Solutions from Etisalat
> -----Original Message----- > From: George Bishop <bishop...@gmail.com> > Date: Sat, 26 Mar 2011 22:53:22 > To: <nycresistormicrocontrollers@googlegroups.com> > Subject: Re: [NYCR:Microcontrollers] capacitors and bateries
> 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
> On Sat, Mar 26, 2011 at 1:54 PM, John Robert <j...@hotmail.com> wrote: >> 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!
>> -- >> You received this message because you are subscribed to the Google Groups >> "NYCResistor:Microcontrollers" group. >> To post to this group, send email to >> nycresistormicrocontrollers@googlegroups.com. >> To unsubscribe from this group, send email to >> nycresistormicrocontrollers+unsubscribe@googlegroups.com. >> For more options, visit this group at >> http://groups.google.com/group/nycresistormicrocontrollers?hl=en.
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