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| references:resistortrimming [2024/07/30 02:55] – tomarnold | references:resistortrimming [2024/07/30 03:33] (current) – external edit 127.0.0.1 | ||
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| Assuming you have a standard carbon film resistor at hand, place it between two alligator clips on your multi meter probes thus. | Assuming you have a standard carbon film resistor at hand, place it between two alligator clips on your multi meter probes thus. | ||
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| Then with a small needle file, file through the coating on the outside of the resistor till you reach the resistive material inside. Then gently file away the resistive material and you'll notice the resistance climb. Of course you can only make the value rise so you need to choose a resistance value lower than your target value. When you reach your desired resistance value, coat the filed out area of the resistor with some nail polish. Where would the electronics industry be without nail polish. I'm sure using it on nails was an after thought. :) | Then with a small needle file, file through the coating on the outside of the resistor till you reach the resistive material inside. Then gently file away the resistive material and you'll notice the resistance climb. Of course you can only make the value rise so you need to choose a resistance value lower than your target value. When you reach your desired resistance value, coat the filed out area of the resistor with some nail polish. Where would the electronics industry be without nail polish. I'm sure using it on nails was an after thought. :) | ||
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| It is important to note that you don't need to use much pressure on the resistor. Partly because it's relatively easy to file past the target value but also because you don't want to place too much mechanical stress on the resistor. You need to be gentle with the resistor. Take it slowly and note that the contact of the file it self might temporarily change the resistor' | It is important to note that you don't need to use much pressure on the resistor. Partly because it's relatively easy to file past the target value but also because you don't want to place too much mechanical stress on the resistor. You need to be gentle with the resistor. Take it slowly and note that the contact of the file it self might temporarily change the resistor' | ||
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| So it's important to note. You should only file it in one spot on the resistor. You should never file around the resistor. | So it's important to note. You should only file it in one spot on the resistor. You should never file around the resistor. | ||
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| Finally as mentioned before, a resistor has a power rating. The standard size and most commonly used in small signal, low voltage electronics being one quarter watt. When you file the resistor, you are actually lowering the power rating of the resistor as well. Ever so slightly may be but it's worth noting. If your circuit required a resistor right on tolerance, you could be in trouble. | Finally as mentioned before, a resistor has a power rating. The standard size and most commonly used in small signal, low voltage electronics being one quarter watt. When you file the resistor, you are actually lowering the power rating of the resistor as well. Ever so slightly may be but it's worth noting. If your circuit required a resistor right on tolerance, you could be in trouble. | ||
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