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5/30/2000 3:57 PM | |
jimi |
Resistor Designations 4M7? I recently ran across resistor designations like these; 4M7 4k7 6k8 1k5 does anyone know the values of these resistors? Thanks |
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5/30/2000 4:12 PM | |
zachary vex | sure, it's a shortcut for 4.7M, 4.7k, 6.8k, and 1.5k. there are more confusing methods for referring to values on resistors, pots, and caps. one is to use a hybrid colorcode reference that looks like three digits... 104 is 100k for a resistor or 100,000 pF (.1 uF) for a cap. that's broken down like this... the one and zero are digits in the final value, the 4 is the number of zeros following those digits. likewise, 333 would be 33k for a resistor/pot, or 33,000 pF (.033 uF) for a cap. that's three-three-and three zeros after. confusing ones? 100, which is 10 ohms or 10 pF, because it's one-zero-and no zeros after. or 101, which converts to 100 ohms or 100 pF, because it's one-zero-and one zero after. the worst part is that on the very tiniest components like monolythic caps and surface-mount parts, you find these weird numbers printed in tan-on-tan and silver-on-black. it's a real squinter. zachary |
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5/30/2000 4:13 PM | ||
Eric H |
I believe these are European designators. Anyway, if you move the letter to the end, and replace it with a decimal point, you're in. Easier to show, than explain: 4M7 is 4.7M(meg-ohm), 6k8 is 6.8k (k-ohm). -Eric |
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5/30/2000 5:28 PM | |
EFX |
Here's a couple more of the International designations that you may see. 22R is 22 ohms and R22 is 0.22 ohms. EFX |
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5/30/2000 11:43 PM | |
Pete |
As everyone else said, it's just in place of a decimal point (i.e 4M7 = 4.7M) The reason that it's written this way is because when circuits are photocopied a lot, decimal points can disappear or start to appear Eg if you had say a 168 ohm resistor (if there was one), the 6 might start looking like a decimal point. So if it were to meant to be a decimal it would look like 1K8 instead. Pete |
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