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  • Easy and cheap CDV-700 tube adapter

    Posted on April 19, 2011 7:11 pm by Johan

    I own a CDV-700 geiger counter of which the tube stopped working. It turns out that replacement tubes are both hard to find and expensive. The simplest option is to buy the LND 720 which basically is a drop-in replacement that should cost about $100.

    It’s also possible to use cheaper, easier to find tubes with the CDV-700.  I found the following post from radio amateur K0FF on the “Geiger Counter Enthousiasts”  group on Yahoo groups. It describes a simple circuit to adapt tubes of varying voltage to the CDV-700. I built one, and it works! Continue reading → Post ID 859


    Electronica english wetenschap/science 📎and tagged civil defense Electronica english geiger counter radioactiviteit radioactivity
  • Terugslag / Setback

    Posted on April 17, 2011 1:36 pm by Johan

    For english, scroll down as usual.

    Post was updated 20/4! – Artikel is 20/4 geupdate!

    Afgelopen vrijdag werd ik wakker met een vuurrood oog nadat ik de vorige avond al wat irritatie had. Kijken naar lichtbronnen gaf ook minder prettige pijnsteken in het oog. Zoals het hoort maar gelijk met een UMC gebeld waar ik dezelfde ochtend nog langsging. Daar stelde men vast dat er tekenen van afstoting te zien waren.

    Zoals gebruikelijk in een academisch ziekenhuis keken er eerst relatief onervaren mensen naar het oog waarna er mensen met meer ervaring naar gingen kijken, tot aan een arts van het cornea-team toe die mij vertelde dat het goed was dat ik zo snel met het ziekenhuis had gebeld. Continue reading → Post ID 859


    english keratoconus medisch/medical 📎and tagged english hoornvliestransplantatie keratoconus lens medisch/medical oog zicht
  • Online geiger counter using Arduino and Cacti

    Posted on April 2, 2011 6:21 pm by Johan

    I have always had an above average interest in radioactivity.  It’s a subject with political, sociological and scientific aspects. I have been mostly interested in the scientific part, but I also closely follow any news and other developments. With the earthquake in Japan and the following nuclear disaster the discussion about nuclear energy has  been fired up after being quite silent for years. In the Netherlands there was talk about building a new reactor next to the existing plant in Borssele. Well, I guess it will be a bit harder now to get support for this plan…

    To be honest, watching the developments with the damaged reactors in Japan got me thinking again. Is nuclear energy a proper way of generating electricity? Sure,  for the immediate surroundings it is very clean. There are virtually no CO2 emissions and with proper shielding and maintenance you’ll need some pretty advanced equipment to measure any radioactivity coming from a reactor. Still, uranium mining is not very nice for the environment and there is no clear solution for storage of waste. And, if a reactor malfunctions there is the possibility of widespread contamination as currently seen in Japan. So, while I am not against nuclear energy my support for it has weakened somewhat.

    Anyway, enough rambling, how to monitor radiation with your computer!

    Update 18/4: Guess I am not the only one doing some monitoring: http://radgoes.blogspot.com

     

    Continue reading → Post ID 859


    Electronica english wetenschap/science 📎and tagged arduino cacti Electronica geigercounter radioactiviteit radioactivity solderen
  • Keratoconus update

    Posted on October 31, 2010 11:11 pm by Johan

    (Scroll down for English summary)

    Met mijn ogen gaat het vrij goed. Vorige week vrijdag zijn de rest van mijn hechtingen in het UMC door Dr. Rouwen verwijderd. Een enigszins irritante behandeling zoals ik eerder al heb beschreven. Ik heb het maar op een vrijdagmiddag gepland zodat ik in het weekend rustig aan kon doen en niet met een oog met visus 0.60 naar computerschermen hoefde te kijken. De zondag erna de lens weer ingehad, verder geen problemen, afgezien van iets wat wel te verwachten viel… Continue reading → Post ID 859


    english keratoconus medisch/medical 📎and tagged hoornvliestransplantatie keratoconus lens medisch/medical oog zicht
  • DS1820 Temp. monitoring using Linux and Cacti

    Posted on October 4, 2010 3:23 pm by Johan

    This article will try to explain how to monitor and graph temperatures remotely using Dallas Semiconductor DS18xx sensors, SNMP and Cacti. DS18xx sensors are relatively cheap, accurate and multiple sensors can be connected to a single bus.

    This guide is based on Ubuntu, so YMMV on other Linux/Unix based systems and may need modification to work properly.

    Continue reading → Post ID 859


    computers-networking Electronica english wetenschap/science 📎and tagged cacti ds1820 sensor temperature

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