General > General Technical Chat

Am colour blind, need help identifying bands

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SiliconWizard:

--- Quote from: pcprogrammer on August 27, 2022, 07:24:12 pm ---
--- Quote from: SiliconWizard on August 27, 2022, 07:00:24 pm ---I know that some countries have "optometrists" who can do a lot more than in others where opthalmologists are the only ones who prescribe.
Over here (and I'm sure that's the case in many other countries as well), "opticians" are basically like pharmacists but for vision correction products only. So they are only allowed to sell, adapt and give some advice, but not prescribe anything indeed. They can also make some minor eye exams such as acuity but just as a check since they can't prescribe.

Never going to an opthalmologist is an issue IMO. Some serious conditions could go undetected for a long time until it may be too late to take action, and opticians or optometrists may not be able to detect them.

--- End quote ---

In the Netherlands the opticians have more qualifications and are trained to do a similar job as an eye doctor. They have a lot of the same equipment and test for all kinds of problems like eye pressure or cataract and will give advice to see a proper eye doctor when needed.

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I see. But in this case and back to what nctnico said, the guy should probably have seen at least an optician and not just a GP, and I'm surprised the GP didn't suggest that. Oh well. :)

tautech:

--- Quote from: wraper on August 27, 2022, 06:55:51 pm ---
--- Quote from: tautech on August 25, 2022, 08:57:16 pm ---Yes often we need lift a leg to get a sensible measurement however there are other ways, a very old one called the razor blade technique. These days we would instead use a scalpel or snap off blade knife to break a nearby trace, get the measurement and later apply a solder bridge over the cut.

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Why would you do this? It's literally faster to desolder a terminal. And then solder it back rather that cutting, scraping solder mask, soldering a jumper wire. The only valid reasons to me would be if the part is hardly accessible on the top side or it is a high pin count device.

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Over the decades PCB layouts have evolved and still they present many faults, namely a lazy layout engineers consideration to possible rework in which there are risks of damaging the PCB.
Older PCB and especially TH layouts and often small thin annular rings subject to lifting and we've all done that haven't we ?
It's a case by case decision to know when to get the scalpel out.

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