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Dag Elias Sørdal
Works at Oceaneering AS
Attended Åkrehamn Videregående Skole
Lives in Tysvær
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Hope this group can help me with a hard question!

How much external pressure can a fire extinguisher withstand before it implodes? Guessing 2mm steel, diameter around 20cm and about 50cm long.

Is there a equation for this?! Thanks
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+Dag Elias Sørdal Look up 'Euler buckling' it addresses this problem, although spheres are a, ah, 'special' case.

Here's a paper:
http://www.sciencedirect.com/science/article/pii/S002076831300200X
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Dag Elias Sørdal

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over half way! its been a great journey! 4 more and then i'll retire ;)
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take a look! :)
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Good one!
 
I think the problem's in the source. 
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Glad to finally change out my old soldering station for a new Weller! Going to be a blast soldering now :)
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I am still using standard 60/40 too, this was certainly not the case as the boards I repair are pretty old and do not use lead free solder.

I am just sharing my experience here, which has led into a strong opinion. Everybody deserves to be proud of his tools. Especially when paid a lot of money on them. A good tech can do miracles even with a steel bar heated in the stove.
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trying to make a video series where i look at differnet IC. Take a look! :)


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Dag Elias Sørdal

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First SMD solder job today!

Changing parts on blown-up Easydriver :)
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+Dag Elias Sørdal
I can see what caps it has on the board. There is one solid state cap that looks to be maybe 47 uF? I like a bit more capacitance myself. Lacking any optical isolation on the control lines I cannot even imagine how the board works. They must employ a different scheme to keep noise from running up those paths. Those boards are built down to a cost so they are pretty minimal.

How did you fry your regulators? You can add reverse biased protection diodes to those. I always do. The 1N4004s in this schematic are protection diodes around a regulator. They make any surge to go back into the power supply and bypass the regulator itself http://i.imgur.com/K1tL4or.png You can also see my optical isolation scheme in that schematic too. It is fiendishly clever if I do say so myself. There's a double inversion that leaves it positive logic. The Schmitt invertor squares the wave up out of the optocoupler too.
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enjoying making this video series :)
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Glad to finally change out my old soldering station for a new Weller! Going to be a blast soldering now :)
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Have him in circles
73 people
Michael Hewitt's profile photo
Ahava Shine's profile photo
Saidou Bah's profile photo
Amanda Brown's profile photo
Kilu Seuntaiwo's profile photo
Magnus Anthun's profile photo
Morten Håvik's profile photo
Daniel Brummitt's profile photo
Gaute Knædal's profile photo
Communities
23 communities
Work
Occupation
ROV Pilot
Skills
electronics, mecanics, woodwork,
Employment
  • Oceaneering AS
    ROV, present
    Lærling osom ROV pilot
  • Seifert
    Student
    Worked at Seifert, Malta for one month fall, 2014. worked with the maintenance crew, maintenance on machines.
  • Eik Senteret Haugesund
    Ekstrahjelp butikk og deleleger
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Tysvær
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Introduction
Alt som kan kjøpes kan lages!

Love JESUS!, 3d printing, making, hacking and reusing
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Education
  • Åkrehamn Videregående Skole
    Automation, 2014 - 2015
  • Karmsuns vgs.
    Electronics, 2014
    Basic electronics, high school
  • Frakkagjerd
    2013
    Ungdomsskole
Basic Information
Gender
Male
Looking for
Networking
Birthday
February 18, 1997
Relationship
Single