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Post by jcoutu1 on Jul 28, 2014 11:39:14 GMT -6
Anyone? I want to stick a pair of resistors into my Colour module rather than using the fuses (recommended in the build instructions). I found the ones that I need on mouser for .10 each, but shipping is $7. I figure that it might just make sense to buy some kit (on Amazon or wherever) with a bunch of stuff to have on hand rather than paying all that shipping for 20 cents worth of product. Any suggestions?
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Post by tonycamphd on Jul 28, 2014 11:53:20 GMT -6
this is why my projects sometimes lag, i try to add up a bunch of parts to save on the shipping, my recommendation is to do exactly that, figure out everything you may need right now to justify the shipping cost, then get mad when they charge you tax even though they aren't in your state lol smh.
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Post by svart on Jul 28, 2014 12:05:38 GMT -6
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Post by jcoutu1 on Jul 28, 2014 12:10:56 GMT -6
I was looking at that Joe Knows kit and the top review says... "Update: I've gone through the tedious task of measuring each of the 86 values in this set and here are my results: 470 ohm - 2% variance 1.5k ohm - 2% variance 100k ohm - 2% variance 270k ohm - 2% variance 470k ohm - 3% variance 330k ohm - 10% variance 680k ohm - 10% variance 5.6M ohm - 30% variance (only one of the resistors read this high, the others hit 1% as expected) The 2% variance, while out of spec, shouldn't be a concern. The 330k and 680k, however, are way off. One of the 5.6M resistors read a whopping 30% off. I'm wondering if there's quality control issues from this batch." Basically, this is the one that I am planning on grabbing unless there is something better that I should look at. |
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Post by svart on Jul 28, 2014 12:32:34 GMT -6
You could spend a lot more money on the kits from Digikey or Mouser.. A lot more. Those are in the hundreds of $$ but I'm sure they are very tight tolerances.
Honestly, for that price, I'd get it and just double check the values before you use them. I've personally never seen any measurements more than a couple of % off, even on no-name chinese resistors.
Then again, if you measure a 5M6 resistor and have even the slightest portion of your skin touching (like holding the resistor to the leads of your meter) you are going to read numbers that are very off.
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Post by jcoutu1 on Jul 28, 2014 12:59:18 GMT -6
You could spend a lot more money on the kits from Digikey or Mouser.. A lot more. Those are in the hundreds of $$ but I'm sure they are very tight tolerances. Honestly, for that price, I'd get it and just double check the values before you use them. I've personally never seen any measurements more than a couple of % off, even on no-name chinese resistors. Then again, if you measure a 5M6 resistor and have even the slightest portion of your skin touching (like holding the resistor to the leads of your meter) you are going to read numbers that are very off. Cool. Thanks man. |
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Post by jsteiger on Jul 28, 2014 19:44:59 GMT -6
I was looking at that Joe Knows kit and the top review says... "Update: I've gone through the tedious task of measuring each of the 86 values in this set and here are my results: 470 ohm - 2% variance 1.5k ohm - 2% variance 100k ohm - 2% variance 270k ohm - 2% variance 470k ohm - 3% variance 330k ohm - 10% variance 680k ohm - 10% variance 5.6M ohm - 30% variance (only one of the resistors read this high, the others hit 1% as expected) The 2% variance, while out of spec, shouldn't be a concern. The 330k and 680k, however, are way off. One of the 5.6M resistors read a whopping 30% off. I'm wondering if there's quality control issues from this batch." Basically, this is the one that I am planning on grabbing unless there is something better that I should look at. And to add, who knows what type of DMM that dude was using. Maybe he had a low battery or was some operator error involved. Believe me, I have heard many many times that R's I ship are way off, then I hear back to never mind, they got it sorted. |
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ericn
Temp
Balance Engineer
Posts: 16,107 
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Post by ericn on Jul 28, 2014 20:06:29 GMT -6
Check your area for electronics supply, every metropolitan area has one. You will beat the local shops prices on line BUT, the value of makeing freinds with the local place that might have what you need now, down the line.
While most of my supplies Come from Mouser, Digikey, Allied or Redco everybody at Electronics Supply Knows me and My 9 year old!
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Post by svart on Jul 28, 2014 20:07:17 GMT -6
I was looking at that Joe Knows kit and the top review says... "Update: I've gone through the tedious task of measuring each of the 86 values in this set and here are my results: 470 ohm - 2% variance 1.5k ohm - 2% variance 100k ohm - 2% variance 270k ohm - 2% variance 470k ohm - 3% variance 330k ohm - 10% variance 680k ohm - 10% variance 5.6M ohm - 30% variance (only one of the resistors read this high, the others hit 1% as expected) The 2% variance, while out of spec, shouldn't be a concern. The 330k and 680k, however, are way off. One of the 5.6M resistors read a whopping 30% off. I'm wondering if there's quality control issues from this batch." Basically, this is the one that I am planning on grabbing unless there is something better that I should look at. And to add, who knows what type of DMM that dude was using. Maybe he had a low battery or was some operator error involved. Believe me, I have heard many many times that R's I ship are way off, then I hear back to never mind, they got it sorted. This. Flukes are notorious for their readings to go wacky once the battery starts dying. |
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Post by mulmany on Jul 28, 2014 22:44:33 GMT -6
I bought that Joe knows kit a while back just to have a bunch of parts on hand for quick repair and prototyping. All the ones I have used have been within the margin. No problems yet.
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Post by jimwilliams on Jul 29, 2014 9:49:41 GMT -6
Radio Shack.
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Post by svart on Jul 29, 2014 10:48:24 GMT -6
Pretty much all the ones in my area have stopped selling parts and related things. Sometimes you can find single pieces there but none of them sell kits and such anymore. |
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Post by jcoutu1 on Jul 30, 2014 9:16:46 GMT -6
Grabbed this kit. Thanks everyone. |
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Post by svart on Jul 30, 2014 9:46:55 GMT -6
No problem. let us know how it works out.
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