Octopart Pocket Electronics Reference PCB(crowdsupply.com) |
Octopart Pocket Electronics Reference PCB(crowdsupply.com) |
https://www.tindie.com/products/NsN/pcb-color-sample-set/?pt...
One gentle suggestion for version 2 is conversions between pico, nano, and micro farads, and the capacitor codes used for these. Because even though it's easy to do it's still nice when you're feeling cognitively challenged to have a cheet sheet.
I mean, c'mon, i haven't used color codes since High School about 17 years ago and i still remember how to decode them. It's not that hard.
i feel that consulting a table is more time consuming that knowing how to decode it... Usually while working with prototyping you end up with lots of resistors, and i can't see someone checking each one at the time against a table to reveal it's value...
But maybe i'm getting it all wrong, someone?
If I needed to do it daily, I'd get real good real fast.
They're generally pretty nice as resistors go. Do you spec better than that?
[1] I used these when they were Philips, which shows how long it is since I was doing this stuff.
We do use a few 0.1% values in some cal equipment--about $1 each!
edit: nevermind, I scrolled down far enough to find it.
Also, any resistors not in a pcb should be in a nice drawer with a neat label; any resistor in a circuit could give misleading values when multimetered because it's in a circuit.
The effect of colour-blindness can also vary hugely from person to person. Even when they share the same type of colour-vision impairment.
Personally, I believe I tend to avoid relying on information coded in colour through habit, even when I can identify with reasonable accuracy the colours involved. Just as someone who is left handed will avoid complex tasks with their right.
Those people don't get Internet access.
But when discussing things it's nice when someone can correctly say "TQFP", or when they see a choice of two ICs and you say "It's the QFP one" and they can pass that tube over.
I thought male pattern colorblindness (far and away the most common type) simply means the inability to distinguish green from red, not total lack of color vision. Hence why I would expect you could still locate resistors with blue bands.
any resistors not in a pcb should be in a nice drawer with a neat label
"Should" being the operative word here. If that always happened, we wouldn't have bothered to give resistors identifying marks.
Yes we would, because we need to know what that resistor is when it's in a PCB. We can't measure it because it may be in parallel with other resistors.
> Hence why I would expect you could still locate resistors with blue bands.
Can you identify what the colours of this image should be? (Ignoring the massive clue in the filename.) :-p
(https://en.wikipedia.org/wiki/File:Rainbow_Deuteranopia.svg)
That's for a severe form of the most common form of color-blindnes.
(https://en.wikipedia.org/wiki/Color_blindness#Classification)
Why couldn't we just label the resistor with silkscreen? We already decided labeling their drawer was better than labeling the resistor, so why not apply the same to the PCB? Easier to read silkscreen than color bands anyway, right?
Can you identify what the colours of this image should be
I said blue. Notice the blue is quite easy to spot in the image you linked. Of course it would still be a pain to try to find the 10k resistors by color, yes, I know that. But at least the color bands wouldn't be totally worthless.
Some resistors are labelled with silkscreen. Those resistors are expensive 1%, 0.1%, or 0.01%.
For run of the mill resistors it's cheaper to use colour coding. Also, when assembling a PCB it's good practice to keep the codes visible. That takes extra time for human operators. I don't know how machines do it for conventional components.
Labelling the PCB is important. There's a space marked R1, and a parts list telling us what R1 should be. There's a resistor in that space. How do we know what that resistor is? We read the color code, or the marking on the device.
There could have been a mistake at the resistor making factory, so we have a goods-in inspector who does some checking of the goods coming into the factory, and we buy from quality vendors and quality manufacturers. We hope the ISO 900x accreditation means something; we hope the certificates of conformity mean something.
