Type of resistence

ive-focus-on-simbol.html

So what do the numbers on the tops read as ? x10 or more magnification required

Perhaps similar to the R47

Regards

This type of resistors are SMD (Surface Mount Device) resistors.

You can buy these in any good electronic parts shop or online. Digikey, Farnell

From the wiki:

Surface mounted resistors are printed with numerical values in a code related to that used on axial resistors. Standard-tolerance surface-mount technology (SMT) resistors are marked with a three-digit code, in which the first two digits are the first two significant digits of the value and the third digit is the power of ten (the number of zeroes). For example:

334 = 33 × 104 ohms = 330 kilohms 222 = 22 × 102 ohms = 2.2 kilohms 473 = 47 × 103 ohms = 47 kilohms 105 = 10 × 105 ohms = 1.0 megohm

Resistances less than 100 ohms are written: 100, 220, 470. The final zero represents ten to the power zero, which is 1. For example:

100 = 10 × 100 ohm = 10 ohms 220 = 22 × 100 ohm = 22 ohms

Sometimes these values are marked as 10 or 22 to prevent a mistake.

Resistances less than 10 ohms have 'R' to indicate the position of the decimal point (radix point). For example:

4R7 = 4.7 ohms R300 = 0.30 ohms 0R22 = 0.22 ohms 0R01 = 0.01 ohms

Precision resistors are marked with a four-digit code, in which the first three digits are the significant figures and the fourth is the power of ten. For example:

1001 = 100 × 101 ohms = 1.00 kilohm 4992 = 499 × 102 ohms = 49.9 kilohm 1000 = 100 × 100 ohm = 100 ohms

000 and 0000 sometimes appear as values on surface-mount zero-ohm links, since these have (approximately) zero resistance.

More recent surface-mount resistors are too small, physically, to permit practical markings to be applied.

There is also an SMD resistor marking scheme that uses a mix of numbers and letters. E.g. 25C = 17.8K 1% and C25 is 10K 5%. A decoder for those is available free at

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Rich Webb     Norfolk, VA

Perhaps you can update the wiki.

Not to mention the SMD resistor marking scheme that saves on production costs by not putting any marking on the thing at all.

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www.wescottdesign.com

As a matter of interest, why do you feel that these devices need replacement ?

Arfa

but this resistence have a polarity?

Regards

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No.

They have a particular name these little resistance?

Regards

They do when I drop one and can't find it JC

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"Surface mount resistors"

still answering to that guy? Do you realize hi's kidding everybody?

No you're thinking of electrolytic resistors. They usually have to polarity clearly marked on them.

Jeff

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"Everything from Crackers to Coffins"

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No, I'm just answering him, not answering to him.

They work better at high frequencies if you install them upside down. Less inductance.

That's the way they always land on the bench anyhow.

John

There actually were electrolytic resistors, actually electrolytic rheostats, but they were usually used at AC.

I once saw a big multi-megavolt Marx generator that used liquid resistors, long clear hoses filled with water and something blue, copper sulfate or some such. Looked cool.

John

Less inductance or higher capacitance (resistive element closer to the plane)?

Yours hit the bench?

Did you forget that he can only 'Pitch a bitch'? ;-)

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It's easy to think outside the box, when you have a cutting torch.