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Old 21st September 2003, 08:47 AM   #1
JDeV is offline JDeV  South Africa
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Default How to ID Tantalum resistors??

Is it possible to identify a Tantalum resistor from a carbon resistor, or any other type of resistor and if so, how??
Do anybody have pictures of tantalum resistors, just for the interest?

Thanx
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Old 21st September 2003, 08:53 AM   #2
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I didn't know there where tantulam resistors...
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Old 21st September 2003, 09:33 AM   #3
Netlist is offline Netlist  Belgium
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Default Re: How to ID Tantalum resistors??

Quote:
Originally posted by JDeV
Is it possible to identify a Tantalum resistor from a carbon resistor, or any other type of resistor and if so, how??
Try this:
http://www.google.be/search?q=%22Tan...-8&hl=nl&meta=

/Hugo
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Old 21st September 2003, 09:48 AM   #4
JDeV is offline JDeV  South Africa
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Default Re: Re: How to ID Tantalum resistors??

Quote:
Originally posted by Netlist

Try this:
http://www.google.be/search?q=%22Tan...-8&hl=nl&meta=

/Hugo

At least found this, but nothing on how to identify
Looks pretty much like any other ol carbon resistor.
The big brown 1 in the pic, would it maybe look like if it is made from a round plastic type of material?
Attached Images
File Type: jpg tant.jpg (45.4 KB, 226 views)
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Old 21st September 2003, 11:12 AM   #5
Netlist is offline Netlist  Belgium
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• Metal film resistors are chosen for precision applications where initial accuracy, low temperature coefficient, and lower noise are required. Metal film resistors are generally composed of Nichrome, tin oxide or tantalum nitride, and are available in either a hermetically sealed or molded phenolic body. Typical applications include bridge circuits, RC oscillators and active filters. Initial accuracies range from 0.1 to 1.0 %, with temperature coefficients ranging between 10 and 100 ppm/°C. Standard values range from 10.0 ohms to 301 kohms in discrete increments of 2% (for 0.5% and 1% rated tolerances).

Quote from Analog devices.
So all we can conclude is that all Tantalum R's are metal film but not vice versa.
That's about as far I'm able to ID

/Hugo
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Old 21st September 2003, 11:53 AM   #6
dhaen is offline dhaen  Europe
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Default Refering to the pic...

Hi,

I know nothing of tantalums, but:

The top pair of "dipped" resistors, I would take to be carbon film.
The bottom row, I would take to be metal film.
The "moulded" resistors shown could be composition, though some modern ones I've come across, especially closer tolerance examples, when opened, have turned out to have a cut helix, just like a film resistor.

Cheers,
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Old 21st September 2003, 12:24 PM   #7
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There is certainly no way to idetify them by looking - i have brown, grey and purple tants. But it's quite easy to id them by listening - they have very different sound to all other resistors.
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Old 21st September 2003, 12:29 PM   #8
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Quote:
Originally posted by analog_sa
There is certainly no way to idetify them by looking - i have brown, grey and purple tants. But it's quite easy to id them by listening - they have very different sound to all other resistors.
Hi Analog_sa,
How do they sound?
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Old 21st September 2003, 12:32 PM   #9
Netlist is offline Netlist  Belgium
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Default Re: Refering to the pic...

Quote:
Originally posted by dhaen

The top pair of "dipped" resistors, I would take to be carbon film.
The bottom row, I would take to be metal film.
The "moulded" resistors shown could be composition, though some modern ones I've come across, especially closer tolerance examples, when opened, have turned out to have a cut helix, just like a film resistor.
I would totally agree with you, if not this:
http://www.hificollective.co.uk/comp...resistors.html
The above pictures come from here and they all seem to be named 'Tantalum'. (You can have the larger pic by clicking on the
magnifying glass)
I am a little suspicious however about what's written on the site
and therefore also about the pictures they display.
E.g.: "In many applications a 2 watt resistor sounds much better that it is 1/2 or 1 watt equivalent".
But this of course is a complete different discussion.

/Hugo
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Old 21st September 2003, 12:52 PM   #10
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Hi,

Quote:
E.g.: "In many applications a 2 watt resistor sounds much better that it is 1/2 or 1 watt equivalent".
This is generally true but it won't turn a crappy brand x 1/4W resistor into a fine sounding resistor if subbed for the same brand x 2W version.

All the tants I've seen look different, the ones sourced from Japan often look as if they're hand-made.

The only way ither then listening to them would be to buy them knowing the exact manufacturer's references and knowing what those look like.

And yes, all of them I heard so far did sound noticebly better than other metal films.

Hope this helps,
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