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Chrometuna
Joined: Aug 14, 2006 Posts: 209 Location: Topeka
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Posted: Tue Feb 27, 2007 11:04 pm Post subject:
Am I resistant to making a boo-boo? Subject description: film, carbon 1% 2%? Whats the diff? |
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I am assembling my 2nd sound lab. Ive been happily soldering in resisters all evening when it occured to me "HAY! These are ALL 1%, when the recipe calls for 5%, AND these are all metal film resisters when the recipe calls for carbon (Or doesnt say which)"
SO, my question is: How much does this matter? 1% is MORE 'accurate' then 5% right? Metal film and carbon film are functionally the same, right? 220K is 220K whether its carbon or metal, right?
Please dont tell me I need to unsolder all of these resistors! |
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andrewF
Joined: Dec 29, 2006 Posts: 1176 Location: australia
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Posted: Tue Feb 27, 2007 11:13 pm Post subject:
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You are okay
there was a time when 1% resistors were a lot more expensive than 5%, so they were specified only when necessary. These days the price difference isn't so much so some people just use 1% metal everywhere.
The % just indicates how close to specification the resistor should be
say a 1% 100K should be between 99k-101k
a 5% - 95k-105k
There are only a few ccts where you need the resistance to be exactly as spec'd |
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toppobrillo
Joined: Dec 10, 2005 Posts: 766 Location: oakland, ca
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Posted: Wed Feb 28, 2007 1:20 am Post subject:
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however, be aware that some 1%'ers have 4 color bands that indicate value: the first three a 3 digit value [4.99 for example] and then the multiplier.
so, a common value like 5.6k would read green, blue, black, brown [5.60].. instead of green, blue, red.... |
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Chrometuna
Joined: Aug 14, 2006 Posts: 209 Location: Topeka
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Posted: Thu Mar 01, 2007 1:54 am Post subject:
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topp wrote: | however, be aware that some 1%'ers have 4 color bands that indicate value: the first three a 3 digit value [4.99 for example] and then the multiplier.
so, a common value like 5.6k would read green, blue, black, brown [5.60].. instead of green, blue, red.... |
Thanks.
I figured that out, and was using the handy-dandy resistor tool on the musicfromouterspace page.
But since my parts from Mouser got here in lightening speed, I had everything all sorted in little plastic baggies and labeled.
Its kinda funny: The plastic bags cost them more then the parts cost!
A little zip lock baggie with TWO resisters in it is kind of funny.
I almost feel like I ripped them off!
Some stuff was back-ordered, but I am sure it will be here soon.
I ordered late thursday night, and the stuff showed up monday morning! |
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etaoin
Joined: Jun 30, 2005 Posts: 761 Location: Utrecht, NL
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Posted: Thu Mar 01, 2007 5:58 am Post subject:
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Quote: |
Its kinda funny: The plastic bags cost them more then the parts cost!
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Conrad (over here in Europe) once sent me a single bag of resistors like this, and didn't even charge shipping...
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zipzap
Joined: Nov 22, 2005 Posts: 559 Location: germany
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fonik
Joined: Jun 07, 2006 Posts: 3950 Location: Germany
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Posted: Mon Mar 12, 2007 4:58 pm Post subject:
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zipzap wrote: | one difference is the power those resistors can handle. Metal usually 0.25W, carbon 0,6W. |
actually not! today metal film resistors are sold as 1/4W but if you take a look at the datasheets you will see that they are actually capable of 0,6W; at least the ones i buy (Reichelt, Conrad). in older times they where all 1/4W. the labeling is only tradition nowadays. _________________
cheers,
matthias
____________
Big Boss at fonitronik
Tech Buddy at Random*Source |
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Uncle Krunkus
Moderator
Joined: Jul 11, 2005 Posts: 4761 Location: Sydney, Australia
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Posted: Mon Mar 12, 2007 6:20 pm Post subject:
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Yeah, the metal film I get are rated at .5W _________________ What makes a space ours, is what we put there, and what we do there. |
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zipzap
Joined: Nov 22, 2005 Posts: 559 Location: germany
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