• Tag Archives Electronica
  • Easy and cheap CDV-700 tube adapter

    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

  • Online geiger counter using Arduino and Cacti

    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

  • Schakelaar…

    Was ik me toch even aan het klooien met een simpele drukschakelaar met een neonlampje als aan/uit indicator. Ik was bezig deze schakelaar in een kastje met een schakelende voeding te zetten.

    Zo’n schakelaar heeft drie aansluitpunten. Twee schakelpunten zijn voor de daadwerkelijke schakelaar, en de derde is voor een neonlampje. Zie het onderstaande plaatje: Continue reading  Post ID 859