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blachanc
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4 bands vs 5 bands resistors (color blind)

Sat Feb 13, 2016 7:31 pm

just replenished my 1987 resistor kit using a ebay vendor.


I ordered thin film 5 bands (blue body).

But the red they use is really strange, to the point I wonder if they simply did not made a mistake.
My ohmmeter is telling me both are 18K...

18K_side_by_side.jpg
new(blue) vs Old.
18K_side_by_side.jpg (43.22 KiB) Viewed 1558 times
new18K.jpg
new18k
new18K.jpg (38.65 KiB) Viewed 1558 times
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blachanc
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Re: 4 bands vs 5 bands resistors (color blind)

Sat Feb 13, 2016 8:05 pm

sorry for replying to my own post.

Ok, there is no mistake.

the red they use is not rendered nicely on a blue body (looks violet)
this is a 27K resistor (showing the red & violet):

new2k7.jpg
27K resistor
new2k7.jpg (41.44 KiB) Viewed 1522 times
Last edited by blachanc on Sat Feb 13, 2016 8:07 pm, edited 1 time in total.
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gordon77
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Re: 4 bands vs 5 bands resistors (color blind)

Sat Feb 13, 2016 8:06 pm

The red looks a bit purple? But more red than orange?

rzusman
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Re: 4 bands vs 5 bands resistors (color blind)

Sat Feb 13, 2016 8:07 pm

The 5-band is saying 180 * 100 = 18K,
The 4-band is saying 18 * 1000 = 18K.

The 5-band is higher precision.

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FTrevorGowen
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Re: 4 bands vs 5 bands resistors (color blind)

Sun Feb 14, 2016 9:34 am

rzusman wrote:The 5-band is saying 180 * 100 = 18K,
The 4-band is saying 18 * 1000 = 18K.
The 5-band is higher precision.
To clarify further:
1 (Brown) 8(Grey) 0(Black) *100(Red ie. 2 decades)
1 (Brown) 8(Grey) *1000(Orange ie. 3 decades)
But I agree, the colours are less clear on a blue background.
Trev.
Still running Raspbian Jessie or Stretch on some older Pi's (an A, B1, 2xB2, B+, P2B, 3xP0, P0W, 2xP3A+, P3B+, P3B, B+, and a A+) but Buster on the P4B's. See: https://www.cpmspectrepi.uk/raspberry_pi/raspiidx.htm

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Burngate
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Re: 4 bands vs 5 bands resistors (color blind)

Sun Feb 14, 2016 9:51 am

blachanc wrote:I ordered thin film 5 bands (blue body) ... My ohmmeter is telling me both are 18K...
Having come across inductors that look exactly the same, I never fit a resistor without first using my meter to confirm that it really is what I think it's telling me it is
blachanc wrote:just replenished my 1987 resistor kit using a ebay vendor.
Thanks for reminding me ... I've needed to do that for some time, now.

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