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08-05-2011, 07:52 PM
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#1 | | I WANT MY 10 YEARS BACK FROM RS.net!
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| Need to find a proper resistor
R1 and R2 should be resistors on the diagram, but what the heck is 6K8 or 6KB?
shouldn't skip gr10 electronic class. 
Last edited by asian_XL; 07-16-2017 at 06:45 AM.
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08-05-2011, 08:18 PM
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#2 | | RS.net, where our google ads make absolutely no sense!
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6k8 = 6.8k Posted via RS Mobile | |
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08-05-2011, 08:28 PM
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#3 | | Revscene.net has a homepage?!
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Yeah they just use it as a decimal basically, 6800 ohm and the color of the stripes would be blue,grey,red and most likely gold or silver. If you use surface mount they use a code usually to identify the resistance.
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08-05-2011, 08:29 PM
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#4 | | I don't get it
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6k8 is 6.8k and yellow/violt/red/orange is 4.7k not sure what orange tolerance is tho Posted via RS Mobile | |
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08-05-2011, 08:33 PM
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#5 | | Revscene.net has a homepage?!
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Originally Posted by spades  6k8 is 6.8k and yellow/violt/red/orange is 4.7k not sure what orange tolerance is tho Posted via RS Mobile | i think oro is gold.
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08-05-2011, 08:37 PM
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#6 | | RS.net, where our google ads make absolutely no sense!
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Originally Posted by silva95teg i think oro is gold. | Yea, it is gold, i think gold is 5 percent, if I remember it correctly.
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08-05-2011, 09:26 PM
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#7 | | I WANT MY 10 YEARS BACK FROM RS.net!
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just came back from an electronic store, what's the voltage of these resistors? can you guys tell?
and the guy told me 6.2K is the standard ohm...never heard of 6.8K ohm..I was like lol
Last edited by asian_XL; 08-05-2011 at 09:31 PM.
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08-05-2011, 09:29 PM
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#8 | | Media Officer / MOD
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^ it's depending on size of the resistor and colour overall
but it's watts not voltage
Watts = Voltage x amperage
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08-05-2011, 09:31 PM
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#9 | | Revscene.net has a homepage?!
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They are usually rated in watts, it looks like a low power one will be fine for you from that schematic.
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08-05-2011, 10:13 PM
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#10 | | RS.net, where our google ads make absolutely no sense!
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Originally Posted by asian_XL just came back from an electronic store, what's the voltage of these resistors? can you guys tell? | It's a voltage reducer, so there's no voltage rating for it. But you need to know it's maximum dissipation power. It usually comes in 1/4, 1/2, 1w for small circuits.
For a serial interface device, I'd say 1/4w is enough, but if you want to play it safe, buy something bigger.
Seems to me you need to do some googling and breadboarding before you start soldering stuff on.
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08-05-2011, 10:46 PM
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#11 | | Ready to be Man handled by RS!
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So what are you building that's using the I2C bus?
6.2K or 6.8K isn't going to matter much. They are pullup resistors required by the I2C bus to limit current. I highly doubt your circuit would care which resistor you used.
There really isn't a voltage rating - resistors are rated by watts. In your case the voltage/current are low so the dissipation in watts is going to be low. 1/4W (which is a common and easy to find value) is going to be plenty enough.
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08-05-2011, 11:10 PM
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#12 | | Ready to be Man handled by RS!
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what are you trying to build?
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08-06-2011, 12:13 AM
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#13 | | I WANT MY 10 YEARS BACK FROM RS.net!
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arrh yeah learned something new today, it's wattage not voltage. Just bought some 6.8K to test it out.
This thing will delete the printer page counter, so it can print 1000 pages more per toner.
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08-06-2011, 08:53 AM
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#14 | | RS.net, helping ugly ppl have sex since 2001
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serial port/usb draws very minimal power, i think 1/4 watts will do for you if you buy through hole resistors.
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