Resistor colours

[Michael Terrell]

On Thursday, December 12, 2019 at 6:44:33 AM UTC-5, pf...@aol.com wrote:
> No fight perceived. Just attempting to point out to the OP and other speculators that these colors are not by accident, and in some cases convey critical information, such as fusible and/or flameproof resistors, not to be replaced with standard types.

Peter, Ii can remember when those Flameproof resistors first went into use. Some consumer equipment had notices to use them for repairs, instead of the Carbon Comp. Others had warnings to only replace them with Flameproof, but as usual most of the hacks ignored the OEMs, because the resistors cost more, and weren't as well stocked by the wholesalers. These were the same losers who refused to properly hand MOSFETs and static sensitive ICs. I got tired of hearing, 'If they can't make good parts, let them go out of business.' If it were up to them TVs would still be all tube.

 

[Stephen Wolstenholme]

On Thu, 12 Dec 2019 04:59:11 -0800 (PST), Michael Terrell
<terrell.michael.a@gmail.com> wrote:

>'If they can't make good parts, let them go out of business.'

That's what my first company was often told. The "power" resistors
were white with the value printed on them in black. After some
exchange of messages I discovered that of our main customer wanted
green rather than white. We started encapsulating the resistors in a
ceramic that was green. Then we got complaints that black writing on
green was difficult to read. So far as I know the company is now using
imported components!

Steve

--
http://www.npsnn.com

 

[Michael Terrell]

On Thursday, December 12, 2019 at 9:14:21 AM UTC-5, Stephen Wolstenholme wrote:

On Thu, 12 Dec 2019 04:59:11 -0800 (PST), Michael Terrell wrote:

'If they can't make good parts, let them go out of business.'

That's what my first company was often told. The "power" resistors
were white with the value printed on them in black. After some
exchange of messages I discovered that of our main customer wanted
green rather than white. We started encapsulating the resistors in a
ceramic that was green. Then we got complaints that black writing on
green was difficult to read. So far as I know the company is now using
imported components!

Some want odd combinations as a cheap trademark, or to make it impossible to repair something without leaving any evidence. They could have dyed the bare white ceramic any color they wanted, or do like Western Electric did, and manufacture their own.

Many US suppliers are gone, because their customers didn't want to pay for quality. Sprague was one of them. OEMs could get parts that barely lasted through the warranty for half what a long life US made capacitor cost when they closed their plant near Orlando. Now, it is a division of Vishay along with other well known American brand names.

BTW, I hate light green signs with white printed text. Over time, the green fades, and the white discolors or is covered by mold that grows on the paint.

 

On Wednesday, 11 December 2019 20:45:20 UTC, Ralph Mowery wrote:

In article <802a7db3-cf40-4a1f-b9db-947f24855ec8@googlegroups.com>,
tabbypurr says...

Think about the construction, I'm not surprised the high R ones tend to drift high


I have found some in the 470 ohm and a few in the 100 and under ohm
range have changed values more than the 10% they are rated for.
Those were new ones in the 25 pack.

They were checked with a Fluke 87 that had been sent out about 6 months
before to a lab that verified it to the NIST to be in caliberation.

Yes, comp are known for drifting & sometimes going noisy. The high R values are much worse for drifting upward, since the internal contact points between grains are both smaller & fewer.


NT

 

[whit3rd]

On Wednesday, December 11, 2019 at 1:58:19 PM UTC-8, Trevor Wilson wrote:

On 11/12/2019 9:30 am, John Robertson wrote:
On 2019/12/10 1:55 p.m., Cursitor Doom wrote:
Anyone else find it bizarre and inexplicable when resistor
manufacturers use coloured bodies for their resitors? The subsequent
coded bands become *far* more difficult to read.

And some of us (7-10% male, <1% female) are red/green colour challenged,

**The very first test I had to pass, before entering the electronics
biz, was a colour blind test.

There's hope for the ten percent, though: cellphones can scan the codes for ya.

<https://play.google.com/store/search?q=resistor%20color%20code%20scanner&c=apps>

 

On Friday, 13 December 2019 08:00:57 UTC, whit3rd wrote:

On Wednesday, December 11, 2019 at 1:58:19 PM UTC-8, Trevor Wilson wrote:
On 11/12/2019 9:30 am, John Robertson wrote:
On 2019/12/10 1:55 p.m., Cursitor Doom wrote:

Anyone else find it bizarre and inexplicable when resistor
manufacturers use coloured bodies for their resitors? The subsequent
coded bands become *far* more difficult to read.

And some of us (7-10% male, <1% female) are red/green colour challenged,

**The very first test I had to pass, before entering the electronics
biz, was a colour blind test.

There's hope for the ten percent, though: cellphones can scan the codes for ya.

https://play.google.com/store/search?q=resistor%20color%20code%20scanner&c=apps

.... at the price of malware.

 

[Cursitor Doom]

On Tue, 10 Dec 2019 20:07:28 -0600, Fox's Mercantile <jdangus@att.net>
wrote:

On 12/10/19 3:55 PM, Cursitor Doom wrote:
Anyone else find it bizarre and inexplicable when resistor
manufacturers use coloured bodies for their resitors? The
subsequent coded bands become *far* more difficult to read.


Don't get out much do you?
Allen Bradly, and most other carbon composition resistor
manufacturers used a brown composition body.
When film resistors started to become popular, they had
white bodies.
The only other color I've seen is a dull red, Usually on 2%
resistors.

I have two assortments of several thousand through-holes I bought
recently from Farnell (never again-terrible service) and Conrad.
Farnell's were bright blue; Conrad's dark green(!) Both extremely
difficult to read (and I don't have any form of colour-blindness).
IME, white-bodied resistors constitute a very small minority.
--

"When constituencies are small their elected representatives must concern themselves with
the local interests of their constituents. When political representatives are distant and
faceless, on the other hand, and represent vast numbers of unknown constituents, they
represent not their constituents, but special interest groups whose lobbyists are numerous
and ever present. Typically in Europe a technocrat is an ex-politician or a civil servant.
He is unelected, virtually impossible to dislodge during his term of employment and has
been granted extensive executive and even legislative power without popular mandate and
without being directly answerable to the people whose interests he falsely purports to
represent."

- Sir James Goldsmith (Member of the European Parliament) 1933 - 1997

 

On Wednesday, December 11, 2019 at 5:18:43 AM UTC-5, bilou wrote:

On 11/12/2019 03:07, Fox's Mercantile wrote:

Allen Bradly, and most other carbon composition resistor
manufacturers used a brown composition body.
When film resistors started to become popular, they had
white bodies.
The only other color I've seen is a dull red, Usually on 2%
resistors.

Of course, wire wound resistors had colors all over the
map. But then they had the values printed on them. No color
code.

Black color is the right choice for anything expected to
dissipate energy.

Anything? Even 'A'phase?

 

[Lucifer]

On Fri, 13 Dec 2019 00:00:54 -0800 (PST), whit3rd <whit3rd@gmail.com>
wrote:

On Wednesday, December 11, 2019 at 1:58:19 PM UTC-8, Trevor Wilson wrote:
On 11/12/2019 9:30 am, John Robertson wrote:
On 2019/12/10 1:55 p.m., Cursitor Doom wrote:
Anyone else find it bizarre and inexplicable when resistor
manufacturers use coloured bodies for their resitors? The subsequent
coded bands become *far* more difficult to read.

And some of us (7-10% male, <1% female) are red/green colour challenged,

I am but I still got into Telstra.