Skip to content
Skip to SEARCH-3
Skip to CATEGORIES-2
Skip to ARCHIVES-2
Skip to META-2

dynode.nl

keratoconus, electronica en diverse onderwerpen

Shrunk Expand

Primary Navigation

  • Home
  • audiostreams
  • over/about
  • straling!
  • te koop/for sale
  • triops
← Older postsNewer posts→
  • Tag Archives Electronica
  • Ludlum Model 2A 500K cpm mod

    Posted on April 18, 2013 4:35 pm by Johan

    ludlum500krange

     

    I recently bought a Ludlum Measurements model 2A survey meter on eBay from Obtanium. This is a nice meter which features the well known rugged Ludlum design, adjustable HV and 3 ranges of 500, 5000 and 50000 counts per minute.

    Using a scintillation probe the meter easily saturates on the 500 cpm scale, and the 5k and 50k ranges are also overloaded with certain sources.

    So I thought of adding a 500k cpm range. I already read the manuals and associated schematics to find out how to do this.

    Ludlum model 2 and 3 offer about the same functionality and basically share the same PCB, circuit, knobs and switches. Depending on age and model there are certain differences, but a lot of the stuff and functionality is the same. Continue reading → Post ID 1165


    📂This entry was posted in Electronica english wetenschap/science 📎and tagged Electronica gamma radiation geiger counter ludlum modding radioactiviteit radioactivity
  • Old Android phone = cheap IP cam

    Posted on August 12, 2012 10:22 pm by Johan

    So, I got me a new Samsung phone because my old phone, a HTC Wildfire is rather slow, especially when it comes to websurfing. It also has low crap resolution. I am much happier with the new phone. So, what to do with the old phone? It’s still a small computer with a camera and touchscreen that should be doing something instead of gathering dust in a drawer.

    One of the things I thought of was a webcam for my turtle tank. It currently houses two (I think female) red cheeked mud turtles, kinosternon cruentatum. I wanted to observe how often one of turtles gets out of the water to bask and what the general activity in the tank is.

    I rooted the phone since I thought it would be handy to have root anyway and installed Cyanogenmod V7, an alternative Android version. This custom ROM does not include the Google Play store to install stuff on Google Play so I had to manually flash it. I am quite unexperienced rooting Android phones and installing custom software but I got it working eventually.

    Next I installed IP Webcam, a nice free webcam app. Since it has a webinterface for remote access it is easily accessible with any computer. Being http-based it’s very easy to grab the images over the wireless LAN that the phone is on using a bash script:

    #!/bin/sh
    wget http://192.168.64.4:8080/shot.jpg
    FILEDATE=$(date)
    montage -geometry +0+0 -background white -label "$FILEDATE" ~/shot.jpg /var/www/meuk/schildpadcam.jpg
    mv ~/shot.jpg /storage/plaatjesenfotoos/schildpadcam_arch/"$(date +%d%m%y%H%M)".jpg

    This script uses wget to fetch the most recent video frame (the app is capturing video all the time), uses the imagemagick tool montage to visually timestamp the image and outputs a new picture in a publicly accessible folder on my server. Finally, the most recently downloaded picture is renamed with a timestamp in the filename and moved to a archive directory on the server. Continue reading → Post ID 1165


    📂This entry was posted in Electronica english wetenschap/science 📎and tagged android bash cyanogenmod Electronica htc ip cam linux timelapse youtube
  • Some rad links…

    Posted on August 1, 2012 7:44 pm by Johan

    Below are some interesting links about radiation (detection) that I have collected over time:

    Have questions about geiger counters, the CDV-700 or gammaspectrometry? Just go to these Yahoo groups:

    CDV700CLUB : The CDV 700 Club is a forum for like minded individuals that enjoy collecting, fixing up, and using geiger counters and other r

    GeigerCounterEnthusiasts : PAGE 2…for Archives go to PAGE1

    GammaSpectrometry : Gamma Spectrometry

    Want videos? Check out these awesome Youtube channels:

    http://www.youtube.com/user/antiprotons?feature=watch

    http://www.youtube.com/user/antiprotons?feature=watch

    Want pictures? Check out the Flickr Radioactivity pool: Continue reading → Post ID 1165


    📂This entry was posted in Electronica english wetenschap/science 📎and tagged Electronica english geiger counter radioactiviteit radioactivity
  • New geiger counter build

    Posted on July 7, 2012 7:56 pm by Johan

    I’m currently building a GM counter for a friend and was looking for nice, low
    power circuits working on 9V cells.

    I found this circuit which is derivative of Charles Wenzel’s designs:

    http://www.mikrocontroller.net/attachment/103170/Geiger_Hochspannung.png

    Components are fairly basic apart from the HV transistor and zeners. The other
    transistors can be basically any small signal PNP/NPN transistor from the
    junkbox. I used BC547 and BC557 and a MPSA44 HV transistor. Continue reading → Post ID 1165


    📂This entry was posted in Electronica english wetenschap/science 📎and tagged Electronica english geiger counter high voltage radioactivity soldering
  • GS-1100A2 teardown and review

    Posted on May 12, 2012 8:58 pm by Johan

    The Australian company Bee Research offers the Gamma Spectacular USB powered scintillation probe bias supplies with integrated preamplifier and audio output. With this box, a scintillation detector and the excellent free PRA software it is possible to perform some basic gamma spectrometry far cheaper than obtaining a multichannel analyser, which usually cost thousands of dollars/euros.

    I bought one of these from a  Yahoo groups Gamma spectrometry member out of curiosity. What’s in this little box? Continue reading → Post ID 1165


    📂This entry was posted in Electronica english wetenschap/science 📎and tagged Electronica english gammaspectroscopy radioactiviteit radioactivity science scintillation detector

Posts pagination

Previous 1 2 3 Next

  • Categories

  • Archives

  • Meta

    • Log in
    • Entries feed
    • Comments feed
    • WordPress.org

©2025 raindrops Entries RSS and Comments RSS Raindrops Theme