| Author |
Message |
royalmp2001
Guest
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 Posted:
Wed Dec 07, 2005 5:35 pm Post subject:
Light blue resistors with 5 band codes? |
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Hi everyone,
What are the light blue resistors? Metal film maybe?
I have some with bands:
Brown - Green - Black - Red - Brown that read 15K on my ohmmeter.
The fourth band confuses me - it is definitely red not orange - any
ideas why?
Oh, and there is a red spot that joins the red and the brown.
Similarly I have some 8.25K resistors that are:
Grey - Red - Green - Brown - Brown with a red dot joining the two
browns.
I'd expect the fourth band to be red not brown.
Also any idea who makes these?
Thanks
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Impmon
Guest
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| Posted:
Wed Dec 07, 2005 5:35 pm Post subject:
Re: Light blue resistors with 5 band codes? |
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On 7 Dec 2005 05:22:19 -0800, "PeteS" <ps@fleetwoodmobile.com> wrote:
| Quote: | Incidentally, the red spot joining the last bands is an orientation
mark so you read it the right way around. The dot will be between the
multipler and the tolerance band.
|
Also wouldn't an all blue resistor indicate flame proof or something?
5 band 1% resistor are not common and usually are used by the
military.
--
When you hear the toilet flush, and hear the words "uh oh", it's already
too late. - by anonymous Mother in Austin, TX
Spam block in place, no emil reply is expected at all. |
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PeteS
Guest
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| Posted:
Wed Dec 07, 2005 5:35 pm Post subject:
Re: Light blue resistors with 5 band codes? |
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Incidentally, the red spot joining the last bands is an orientation
mark so you read it the right way around. The dot will be between the
multipler and the tolerance band.
Cheers
PeteS
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PeteS
Guest
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| Posted:
Wed Dec 07, 2005 5:35 pm Post subject:
Re: Light blue resistors with 5 band codes? |
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royalmp2001 wrote:
| Quote: | Hi everyone,
What are the light blue resistors? Metal film maybe?
I have some with bands:
Brown - Green - Black - Red - Brown that read 15K on my ohmmeter.
The fourth band confuses me - it is definitely red not orange - any
ideas why?
Oh, and there is a red spot that joins the red and the brown.
Similarly I have some 8.25K resistors that are:
Grey - Red - Green - Brown - Brown with a red dot joining the two
browns.
I'd expect the fourth band to be red not brown.
Also any idea who makes these?
Thanks
|
1% resistors have 5 bands, not 4.
The sequence is
Digit 1, Digit 2, Digit 3, Multipler, Tolerance
(Unlike 5% or lower resistors that have only 2 digits identified).
Grey, Red, Green, Brown, Brown is:
8 2 5 x10^1 1%
8.25k, 1%
A number of manufacturers make them. Try Vishay Dale, KAO-Speer and
Bourns for starters.
Cheers
PeteS |
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Don Bruder
Guest
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| Posted:
Thu Dec 08, 2005 12:03 am Post subject:
Re: Light blue resistors with 5 band codes? |
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In article <q01ep1p4ebi0gbrkl3e8cdov6ef2qf58gv@4ax.com>,
Impmon <impmon@digi.mon> wrote:
| Quote: | On 7 Dec 2005 05:22:19 -0800, "PeteS" <ps@fleetwoodmobile.com> wrote:
Incidentally, the red spot joining the last bands is an orientation
mark so you read it the right way around. The dot will be between the
multipler and the tolerance band.
Also wouldn't an all blue resistor indicate flame proof or something?
|
I've caught that bit of... information? scuttlebutt? urban legend?
myself a few times through the years. Haven't ever found a definitive
"That's reality" or "That's a crock" verdict on the concept, though.
According to the way I've most often heard it, the "regular" resistors
are just that - "regular" - Overload 'em, and they'll go up in smoke,
possibly in literal flames as the carbon burns up. The pale blue ones
are supposed to be non-flammable (They'll get hot and cook off if
overloaded, but won't actually burst into flames, although they might
get hot enough to touch off any flammable/explosive atmosphere
surrounding them when they do) and the green ones are supposed to die
without flames OR getting hot enough to ignite most flammable or
explosive atmospheres they might be found in.
--
Don Bruder - dakidd@sonic.net - If your "From:" address isn't on my whitelist,
or the subject of the message doesn't contain the exact text "PopperAndShadow"
somewhere, any message sent to this address will go in the garbage without my
ever knowing it arrived. Sorry... <http://www.sonic.net/~dakidd> for more info |
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Pooh Bear
Guest
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| Posted:
Thu Dec 08, 2005 1:35 am Post subject:
Re: Light blue resistors with 5 band codes? |
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royalmp2001 wrote:
| Quote: | Hi everyone,
What are the light blue resistors? Metal film maybe?
I have some with bands:
Brown - Green - Black - Red - Brown that read 15K on my ohmmeter.
The fourth band confuses me - it is definitely red not orange - any
ideas why?
Oh, and there is a red spot that joins the red and the brown.
Similarly I have some 8.25K resistors that are:
Grey - Red - Green - Brown - Brown with a red dot joining the two
browns.
I'd expect the fourth band to be red not brown.
|
Resistors with 4 bands don't use the same multiplier as those with 3
bands 'cos there's an extra digit provided by the extra band.
Graham |
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Pooh Bear
Guest
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| Posted:
Thu Dec 08, 2005 1:35 am Post subject:
Re: Light blue resistors with 5 band codes? |
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Impmon wrote:
| Quote: | On 7 Dec 2005 05:22:19 -0800, "PeteS" <ps@fleetwoodmobile.com> wrote:
Incidentally, the red spot joining the last bands is an orientation
mark so you read it the right way around. The dot will be between the
multipler and the tolerance band.
Also wouldn't an all blue resistor indicate flame proof or something?
5 band 1% resistor are not common and usually are used by the
military.
|
Flame proof Rs are normally made with a 'cement' coating and it looks like
it. Typically dull grey and a slightly rough surface finish.
Graham |
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Rich Grise
Guest
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| Posted:
Thu Dec 08, 2005 9:35 am Post subject:
Re: Light blue resistors with 5 band codes? |
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On Wed, 07 Dec 2005 23:38:48 +0000, Pooh Bear wrote:
| Quote: | royalmp2001 wrote:
Hi everyone,
What are the light blue resistors? Metal film maybe? I have some with
bands:
Brown - Green - Black - Red - Brown that read 15K on my ohmmeter. The
fourth band confuses me - it is definitely red not orange - any ideas
why?
Oh, and there is a red spot that joins the red and the brown.
Similarly I have some 8.25K resistors that are: Grey - Red - Green -
Brown - Brown with a red dot joining the two browns.
I'd expect the fourth band to be red not brown.
Resistors with 4 bands don't use the same multiplier as those with 3 bands
'cos there's an extra digit provided by the extra band.
|
I want to bring up semantics here. What do you mean by "the same
multiplier"? It still is "the number of zeros after the other digits",
isn't it? But it'll be one less than the 5% Rs, because of the other
digit. For example, a 22K 5% would be red, red, orange, <whatever the
5% color is>, and a 22K 1% would be red, red, black, red, <apparently
brown for 1%>.
So the properties of the multiplier are the same, it's just not the same
numeric value because of the additional digit.
That's what you meant, right? :-)
Cheers!
Rich |
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Rich Grise
Guest
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| Posted:
Thu Dec 08, 2005 9:35 am Post subject:
Re: Light blue resistors with 5 band codes? |
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On Wed, 07 Dec 2005 10:03:09 -0800, Don Bruder wrote:
| Quote: | In article <q01ep1p4ebi0gbrkl3e8cdov6ef2qf58gv@4ax.com>,
Impmon <impmon@digi.mon> wrote:
On 7 Dec 2005 05:22:19 -0800, "PeteS" <ps@fleetwoodmobile.com> wrote:
Incidentally, the red spot joining the last bands is an orientation
mark so you read it the right way around. The dot will be between the
multipler and the tolerance band.
Also wouldn't an all blue resistor indicate flame proof or something?
I've caught that bit of... information? scuttlebutt? urban legend? myself
a few times through the years. Haven't ever found a definitive "That's
reality" or "That's a crock" verdict on the concept, though. According to
the way I've most often heard it, the "regular" resistors are just that -
"regular" - Overload 'em, and they'll go up in smoke, possibly in literal
flames as the carbon burns up. The pale blue ones are supposed to be
non-flammable (They'll get hot and cook off if overloaded, but won't
actually burst into flames, although they might get hot enough to touch
off any flammable/explosive atmosphere surrounding them when they do) and
the green ones are supposed to die without flames OR getting hot enough to
ignite most flammable or explosive atmospheres they might be found in.
|
<AOL>
Me, Too!
</AOL>
Cheers!
Rich |
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Rich Grise
Guest
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| Posted:
Thu Dec 08, 2005 9:35 am Post subject:
Re: Light blue resistors with 5 band codes? |
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On Wed, 07 Dec 2005 10:48:20 -0500, Impmon wrote:
| Quote: | On 7 Dec 2005 05:22:19 -0800, "PeteS" <ps@fleetwoodmobile.com> wrote:
Incidentally, the red spot joining the last bands is an orientation mark
so you read it the right way around. The dot will be between the
multipler and the tolerance band.
Also wouldn't an all blue resistor indicate flame proof or something? 5
band 1% resistor are not common and usually are used by the military.
|
I saw a lot of blue 5-band resistors in the military. I have no idea what
the difference is, other than costing 10X as much as ordinary parts. ;-)
Cheers!
Rich |
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PeteS
Guest
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| Posted:
Thu Dec 08, 2005 9:35 am Post subject:
Re: Light blue resistors with 5 band codes? |
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Impmon wrote:
| Quote: | On 7 Dec 2005 05:22:19 -0800, "PeteS" <ps@fleetwoodmobile.com> wrote:
Incidentally, the red spot joining the last bands is an orientation
mark so you read it the right way around. The dot will be between the
multipler and the tolerance band.
Also wouldn't an all blue resistor indicate flame proof or something?
5 band 1% resistor are not common and usually are used by the
military.
|
I would differ here. I have worked at a number of places where we used
5 band (1% and 2%) resistors all over the place, back in the days I
still commonly used through hole parts.
| Quote: | --
When you hear the toilet flush, and hear the words "uh oh", it's already
too late. - by anonymous Mother in Austin, TX
Spam block in place, no emil reply is expected at all.
|
Cheers
PeteS |
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Impmon
Guest
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| Posted:
Thu Dec 08, 2005 5:35 pm Post subject:
Re: Light blue resistors with 5 band codes? |
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On Thu, 08 Dec 2005 04:36:29 GMT, Rich Grise <richgrise@example.net>
wrote:
| Quote: | I want to bring up semantics here. What do you mean by "the same
multiplier"? It still is "the number of zeros after the other digits",
isn't it? But it'll be one less than the 5% Rs, because of the other
digit. For example, a 22K 5% would be red, red, orange, <whatever the
5% color is>, and a 22K 1% would be red, red, black, red, <apparently
brown for 1%>.
|
That is correct, the multiplier stays the same with both 4 and 5 band
resistor. And FYI the 5% would be gold band. Silver is 10% and if
you come across 3 band resistor, assume 20% tolerance. Red is 2 and
brown is 1. I think there's also black for 0.5%.
--
When you hear the toilet flush, and hear the words "uh oh", it's already
too late. - by anonymous Mother in Austin, TX
Spam block in place, no emil reply is expected at all. |
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Dr. Anton T. Squeegee
Guest
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| Posted:
Thu Dec 08, 2005 5:35 pm Post subject:
Re: Light blue resistors with 5 band codes? |
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In article <q01ep1p4ebi0gbrkl3e8cdov6ef2qf58gv@4ax.com>, impmon@digi.mon
says...
| Quote: | On 7 Dec 2005 05:22:19 -0800, "PeteS" <ps@fleetwoodmobile.com> wrote:
Incidentally, the red spot joining the last bands is an orientation
mark so you read it the right way around. The dot will be between the
multipler and the tolerance band.
Also wouldn't an all blue resistor indicate flame proof or something?
5 band 1% resistor are not common and usually are used by the
military.
|
I can't speak to the flame-proofing bit, but the last time I
ordered regular commercial-grade 1% resistors from DigiKey, they had
blue bodies and five color bands.
My point is that five-banders are likely much more common than you
may have been led to understand.
Keep the peace(es).
--
Dr. Anton T. Squeegee, Director, Dutch Surrealist Plumbing Institute.
(Known to some as Bruce Lane, ARS KC7GR,
kyrrin (a/t) bluefeathertech[d=o=t]calm -- www.bluefeathertech.com
"If Salvador Dali had owned a computer, would it have been equipped
with surreal ports?" |
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Pooh Bear
Guest
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| Posted:
Fri Dec 09, 2005 1:35 am Post subject:
Re: Light blue resistors with 5 band codes? |
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Rich Grise wrote:
| Quote: | On Wed, 07 Dec 2005 23:38:48 +0000, Pooh Bear wrote:
royalmp2001 wrote:
Hi everyone,
What are the light blue resistors? Metal film maybe? I have some with
bands:
Brown - Green - Black - Red - Brown that read 15K on my ohmmeter. The
fourth band confuses me - it is definitely red not orange - any ideas
why?
Oh, and there is a red spot that joins the red and the brown.
Similarly I have some 8.25K resistors that are: Grey - Red - Green -
Brown - Brown with a red dot joining the two browns.
I'd expect the fourth band to be red not brown.
Resistors with 4 bands don't use the same multiplier as those with 3 bands
'cos there's an extra digit provided by the extra band.
I want to bring up semantics here. What do you mean by "the same
multiplier"? It still is "the number of zeros after the other digits",
isn't it? But it'll be one less than the 5% Rs, because of the other
digit. For example, a 22K 5% would be red, red, orange, <whatever the
5% color is>, and a 22K 1% would be red, red, black, red, <apparently
brown for 1%>.
So the properties of the multiplier are the same, it's just not the same
numeric value because of the additional digit.
That's what you meant, right? :-)
|
Yup ! :-)
As in you might expect to see an orange band multiplier for a 47k but instead
it's red.
Graham |
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Pooh Bear
Guest
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| Posted:
Fri Dec 09, 2005 1:35 am Post subject:
Re: Light blue resistors with 5 band codes? |
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Impmon wrote:
| Quote: | On Thu, 08 Dec 2005 04:36:29 GMT, Rich Grise <richgrise@example.net
wrote:
I want to bring up semantics here. What do you mean by "the same
multiplier"? It still is "the number of zeros after the other digits",
isn't it? But it'll be one less than the 5% Rs, because of the other
digit. For example, a 22K 5% would be red, red, orange, <whatever the
5% color is>, and a 22K 1% would be red, red, black, red, <apparently
brown for 1%>.
That is correct, the multiplier stays the same with both 4 and 5 band
resistor. And FYI the 5% would be gold band. Silver is 10% and if
you come across 3 band resistor, assume 20% tolerance. Red is 2 and
brown is 1. I think there's also black for 0.5%.
|
Goodness. I can't even remember when I last saw a silver band.
Graham |
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