need more power (literally)

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Old Nov 14, 2007 | 12:13 PM
  #16  
Low_e_Red's Avatar
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Originally Posted by scottbigred
im still learning so bear with me please. the idea behind a cap isnt to keep the current up correct? its so that when a voltage drop is sensed across the circuit it trys to eliminate that correct?
Thats an inductor. Capacitors oppose a change in voltage.
 
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Old Nov 14, 2007 | 06:21 PM
  #17  
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Do the big 3 first...
 
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Old Nov 14, 2007 | 10:46 PM
  #18  
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Originally Posted by Low_e_Red
Thats an inductor. Capacitors oppose a change in voltage.
its kinda like trying to make a sine wave flat right? basically keeping it at its peak voltage at all times and not letting it drop? so your peak voltage is say 12v, when it goes through its cycle from 0v to 12v to 0v to -12v to 0v to 12v and so on its trying to make it stay at just 12vs right? or am i just confusing myself here? sorry for all the questions, just tryin to set myself straight lol
 
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Old Nov 14, 2007 | 10:59 PM
  #19  
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From: Slidell, LA
Originally Posted by scottbigred
its kinda like trying to make a sine wave flat right? basically keeping it at its peak voltage at all times and not letting it drop? so your peak voltage is say 12v, when it goes through its cycle from 0v to 12v to 0v to -12v to 0v to 12v and so on its trying to make it stay at just 12vs right? or am i just confusing myself here? sorry for all the questions, just tryin to set myself straight lol
Yes if you are dealing with AC voltage... Thats why you use a cap for a LPF... You are passing waves closer to DC. A cap likes to steady out a vibrating wave. If that makes any sense. (This is in a sense. There are other points that i really dont want to discuss on a forum... It will confuse a lot of ppl and really make it harder for someone else...)
 
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Old Nov 14, 2007 | 11:51 PM
  #20  
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ya i gotcha. so is this just something you picked up on as a hobby or did you go to school for this? we've been learning about caps and inductors for a couple weeks now and its really pretty interesting stuff. first thing we learned is the danger of caps and how to properly discharge one. i sure never knew how dangerous it could actually be. well anyways thanks for letting me pick your brain for a bit
 
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Old Nov 15, 2007 | 12:05 AM
  #21  
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Originally Posted by scottbigred
first thing we learned is the danger of caps and how to properly discharge one
Ha. My first instructor charged up .5 microfarad caps and sat them down infront of us then just stared at us like idiots...then we would pick it up and say "What the heck is this fo...SONOFABISH" I learned the first time easy enough.
 
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Old Nov 15, 2007 | 12:20 AM
  #22  
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Originally Posted by Bartak1
Ha. My first instructor charged up .5 microfarad caps and sat them down infront of us then just stared at us like idiots...then we would pick it up and say "What the heck is this fo...SONOFABISH" I learned the first time easy enough.

lol mine to one (cant remember size) and juiced it up to like 200 volts and dropped some wire strands across the terminals a few times. pretty funny to watch everyone jump lol
off subject i know but i was just thinking that it would be way cool to build a tesla coil huh lol
 
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Old Nov 15, 2007 | 04:14 AM
  #23  
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Originally Posted by Low_e_Red
"largest capacitor in the car"...
reminicing e-learnings
 
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Old Nov 15, 2007 | 05:02 AM
  #24  
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From: Slidell, LA
Originally Posted by DRJ
reminicing e-learnings
Ya e-learnings may say that. But there is truth to it.

You can take a 1F cap and stick it to your tongue fully charged and nothing happen. I wouldnt of believed this had i not seen it. (I aint got the nuts... lol. I like my tongue.) Its all how its handled...

One of my master level friends before i had a clue. Abt killed me w/ a 9v battery and a relay... Spike Suppresion is a GOD!!! That hurt like HELL.

Where are you learning abt this stuff? I had help from some GENIUSES but I really taught 85% to myself. Most of my family has had engineering experience. Some Mech, Civil, Electrical, etc... So i have a knack for engineering and self-taught learning.
 
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Old Nov 15, 2007 | 05:07 AM
  #25  
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From: Slidell, LA
Originally Posted by scottbigred
first thing we learned is the danger of caps and how to properly discharge one. i sure never knew how dangerous it could actually be. well anyways thanks for letting me pick your brain for a bit
First of all, (or whatever # Im on..) There are two ways to discharge a cap:
One is take a wire and touch (+) to (-). Downfall is you put a burn mark on the cap. Customers BITCH.
Two, take a test light and discharge in the opposite way you charged it. Downfall it can take a while. PITA. Time is money and money is time...

Second, No problem bro. Hope you learn/ed something.
 
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Old Nov 15, 2007 | 11:50 AM
  #26  
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well if you were asking me where im learning this stuff im getting my 2 year industrial electric degree at my local college. the way he showed us to discharge the cap was to use like a 10 ohm resistor that could handle a high amount of watts. and touch that across the terminals. you wouldnt have ever by chance built a leyden (spelling?) jar?
 
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Old Nov 15, 2007 | 08:55 PM
  #27  
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From: Slidell, LA
Originally Posted by scottbigred
well if you were asking me where im learning this stuff im getting my 2 year industrial electric degree at my local college. the way he showed us to discharge the cap was to use like a 10 ohm resistor that could handle a high amount of watts. and touch that across the terminals. you wouldnt have ever by chance built a leyden (spelling?) jar?
Probably have... But Im not sure... Info.

Ya the test light does the same thing... The light is actually a resistor that heats up and produces light.
 
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