Jump to content

CE Auto Electric Supply
Welcome to SMD Forum
Register now to gain access to all of our features. Once registered and logged in, you will be able to create topics, post replies to existing threads, give reputation to your fellow members, get your own private messenger, post status updates, manage your profile and so much more. If you already have an account, login here - otherwise create an account for free today!
Photo

Capacitors - What's the REAL story?


256 replies to this topic

#133
Ninja_v1.0

Ninja_v1.0

    170db

  • Super Moderator
  • 4,911 posts
  • Gender:Male
  • Location:the clouds
waiting for the link to buy the book to get the answer

:unknw:

:ninja:

Edited by sensai_v3.6, 19 December 2012 - 08:56 AM.

When your at the top everyone is coming for you, friends, family, haters and even those who don't know you.. my advice.. KILL EM ALL

 


#134
snafu

snafu

    SMD Sales & Marketing

  • SMD PARTNER

  • 1,743 posts
  • Gender:Male
Mr. D - I was waiting for your input, what took ya' so long?

Now, let's say that we were playing music at clipping with our 5kw system . . . think 20ms or so on peaks. How's that math work?

#135
ric006

ric006

    155db

  • UBL Approved Group


  • 2,357 posts
  • Gender:Male
  • Location:El Mirage,AZ
  • Interests:My Kids, My Avatar, Car Audio, and my PS3
Garage View Garage
i would say for a car system under 1500 rms you can use a battery and a capacitor that was the old school way now days as we progressed you have to upgrade your alternator put extra batteries in and more






123_zpsdd06b4db.png


#136
mikelbolton

mikelbolton

    130db

  • Members
  • 442 posts
  • Gender:Male
  • Location:Wilson, NC
  • Interests:Cars, guitars, and bass
Garage View Garage

i would say for a car system under 1500 rms you can use a battery and a capacitor that was the old school way now days as we progressed you have to upgrade your alternator put extra batteries in and more


No offense, but I think you're missing the point. The power that a cap can put out is limited to the amount of potential difference in the power that the cap contains and the input voltage that the amp is getting. A cap in itself will not contain enough energy to provide ample power to offset the potential difference for enough length of time to make a difference.

A battery is exponentially more powerful than a cap, and therefore can offset potential differences in the input voltage. Nothing is going to completely overcome an inadequate charging system, although a battery bank can give you reserve capacity to lessen the potential difference until the electrical demand drops low enough that the alternator can meet the demand and ultimately recharge the batteries.

Conclusion:
1.alternator with enough headroom is a must
2. followed by supporting mods (big 3, proper grounds, etc)
3. battery bank large enough to support the length of time that playing at volumes that require more power than charging system can produce



Unless, you're able to make room and pay for 2500(1F) capacitors, to be used in 30 second increments (sorry, no playing full songs)


Thanks Tony D

2011 Chevrolet Aveo(click for build log)
Clarion NX-603
SKAR 4500.1D
Iraggi 320A alt

Knukonceptz 1/0 Kollosus Fleks Cable
8 AWG Sky High Car Audio OFC

1/0- Sky High Car Audio

2- XP3000 XS Power Batteries
SMD VM-1
2- 12" Ascendant Audio Mayhems

Toolmaker Fuse block

Toolmaker Bus Bars

 

(Last Season scores 1-15" Mayhem)

145.2 dB- Sealed @ NSPL World Finals (9/28/14)

148.1 dB- Hardcore @ NSPL World Finals (9/27/14)

150.23-- Hardcore on 4500 Watts!!!!

 

New Build (2015, 2-12" Mayhems)

146.9- Sealed on dash 

149.6 dB- Hardcore in Kick (No wall 0-24" Hardcore)


#137
TonyD'Amore

TonyD'Amore

    130db

  • SMD PARTNER

  • 399 posts
  • Gender:Male

Mr. D - I was waiting for your input, what took ya' so long?

Now, let's say that we were playing music at clipping with our 5kw system . . . think 20ms or so on peaks. How's that math work?


Well subwoofer amplifiers are what we are talking about here, and 20ms isn't bass. Just one cycle of 50Hz is 20ms. I measured a kick drum back in the Rockford Days to be well over 100ms. I'd go as far to say, as far as modern synthetic compressed bass, anything less than a second of storage is fairly meaningless.

Edited by TonyD'Amore, 19 December 2012 - 04:16 PM.


#138
Sanitarium

Sanitarium

    SOTM Champion November 2010

  • Banned


  • 3,529 posts
  • Gender:Male
  • Location:West of ATL, GA
  • Interests:Guitars, Computers, Music, Loud Music, Louder Music

Corrected version:
J=(CV^2)/2 (J= joules, C=capacitance, V=voltage)
for a 1 farad capacitor on a system charging at 14.2 (voltage = random number somewhere around normal car voltage I pulled out my ass for the sake of this post)

J = 1 x (14.2x14.2) / 2
---->snip<-----
So who's buying me a 2500 farad capacitor bank?


... OUCH. thanks for the correction and further proving my point of how worthless caps are for guys like us. :cheers:

#139
IH8PunkRok

IH8PunkRok

    Goldilocks

  • 18+ All Access!
  • 12,343 posts
  • Gender:Male
  • Location:The 502, Kentucky
Since the smart guys are in here I'll ask this question.
How do batteries interface with caps? Considering the low esr wouldn't a battery see a cap not at potential voltage as a short circuit?
throw some more numbers at me in a realistic situation like above

-Matt

2005 Dodge Magnum RT
JVC KD-AVX1

2 PPI S580.2

Obsidian Audio ST1 Horn Tweeters

PRV 8MB450s

Audiopipe APK 5500

American Bass HD 15

XS D1200
2 Deka 9a31s
Shok 1/0



Kicker CVR 15's build
DD 3512e build
Mini T-Line Build
(6) 8s Build
Nightshade 15s Wall Build
Magnum AB XFL 12s Build
Newest Magnum Build


#140
poorfish88

poorfish88

    150db

  • Members
  • 1,508 posts
  • Gender:Male
  • Location:Florida
  • Interests:Just chillin been messing with car audio since late 80's.


Mr. D - I was waiting for your input, what took ya' so long?

Now, let's say that we were playing music at clipping with our 5kw system . . . think 20ms or so on peaks. How's that math work?


Well subwoofer amplifiers are what we are talking about here, and 20ms isn't bass. Just one cycle of 50Hz is 20ms. I measured a kick drum back in the Rockford Days to be well over 100ms. I'd go as far to say, as far as modern synthetic compressed bass, anything less than a second of storage is fairly meaningless.

Did you leave Rockford cause they wouldn't stop selling useless caps? I kid I kid

#141
snafu

snafu

    SMD Sales & Marketing

  • SMD PARTNER

  • 1,743 posts
  • Gender:Male
He left Rockford for the same reason I did . . . LOL!

#142
sayhuh?

sayhuh?

    165db

  • 18+ All Access!
  • 3,810 posts
  • Gender:Male
  • Location:Maryland
Caps aren't useless, but just aren't affordable? Therefore useless??

lol

10501650_10203332501847103_1859383749711

                   Blown


#143
Brandon15zzz

Brandon15zzz

    Bought Today... Sold Tomorrow...

  • Members

  • 4,032 posts
  • Gender:Male
  • Location:The Big NA
Caps are affordable. Just have to look around. Also have to know what to look for.

[color=rgb(0,0,0);]Vehicle: 1995 Impala SS
Head Unit: Pioneer AVH-P4400BH
Mids And Highs: (still deciding)
Batteries: 1 Deka Group 34[/color]
 

[color=rgb(0,0,0);]Time to make a race car.[/color]

[color=rgb(0,0,0);]My Build Log: Solo X 12"
[color=rgb(0,0,0);]http://www.stevemead...don15zzz-build/[/color]
My Build Log: DC lvl 4 xl 15"
[color=rgb(0,0,0);]http://www.stevemead...don15zzz-build-[/color]
[color=rgb(0,0,0);]My Wall Build Log: 4 Lanzar 15's/ 3k+ RMS
http://www.stevemead...t-by-techforce/[/color]
[color=rgb(0,0,0);]My Feedback:[/color]
http://www.stevemead...1[/color]


#144
Bump4life

Bump4life

    System of the Month November 2014

  • S.O.T.M. Winner

  • 4,641 posts
  • Gender:Male
  • Interests:Strong Electrical
cant we just get the answer!! I want to learn!! i read through 8 pages. snafu!! i want the answer!!!! :Doh: :dammit:
me "give me the answer now!!!" >>>> :fryingpan:<< snafu "not yet, you must keep guessing and thinking and burning your brains out"

Buyer/Seller Feedback Thread: http://www.stevemead...5015-bump4life/
My MB C220 153 Trunk Car Build Log: http://www.stevemead...d/#entry1840136
My Current DA SQ Build Log: http://www.stevemead...tage-installed/
My SPL Log: http://www.stevemead...__fromsearch__1
 
Mercedes Benz C Class 99
Highs/Mid Highs/Mid-Bass
-Ipad Mini with Pure i20 Digital out to Audison Bitone      
-JL Audio XD 400/4            
-ARC Audio KS300.4
-2 Audison Voce AV 6.5s and 2 Voce AV1.1 Tweets
SUB-Stage
-1 DD M2c
-1 DD Z95 10 in a Quasi Sixth Order
Electrical
Custom 240A alt built by yours truly with Big 3 and stock battery.
Best Scores out of a trunk
153.0 sealed legal full tilt clamped 5524 @ 42 hz
154+ windows down, 155+ kick
 




Reply to this topic



  


0 user(s) are reading this topic

0 members, 0 guests, 0 anonymous users