Hello, thanks replying to me ;) Indeed, I've already read this document, but it is a little but confusing to me; there is no clear Bq/kg value. Also, article says that : "The radiation detector [with BPW pin diode] that the pupils assembled and used in their measurements. " "All mushroom samples have been measured with a HPGe detector, resulting in gamma spectra from which we have determined the activity of 137Cs." The problem is that some HPGe detectors are far more sensitive with low-activity sources than BPW34 PIN diodes. On projects I've built from Elektors/Kainka projects, it is hard to get more that few pulses per minutes, even with radium sources; so far away from detecting hundreds of Bq/kg. So do you know what were values detected by students with Elektor's BPW34 circuits ? Thanks in advance

Technical Specifications 1. Microcontroller ATmega328 2. 3-AXIS Digital Accelerometer ADXL335 3. Lipo Battery with Charging Board Module 4. 433MHz Wireless Remote Control Transmitter 5. Compact Power Module - voltage input (AC: 90 ~ 264V) the system is based on the ADXL335 accelerometer that has a detection range of ±3 g. It can measure the static acceleration due to gravity , as well as dynamic acceleration resulting from motion, shock, or vibration. A metal ring mounted on the sensor ADXL335 contains perimeter loose steel spheres and magnifies the weak vibrations of the building creating a more intense shock to the sensor the appliance must be plugged in in standby mode in a room outlet the LED will be green (standby mode) Ability to enable / disable device with Power switch the vibration of the building will turn on the device and it will sound alarm the LED will turn red will also activate wireless receivers alarms in other rooms at frequency 433Mhz when the building stops vibrating the audible alarm will stop the LED will turn yellow and the device will return to standby mode the LED will remain yellow (as a memory) reminding that there has been a vibration if we want to restore the entire system to its original state we ,press the reset button  

The latest video of the EEZ BB3...

How big a problem is it to improve an already amazing soldering station? Actually ? You have sold a lot of these, so surely more than just 2 want to be able to utilize Wellers 150 Watt solder tips! Sorry if my questions are stupid but isn't it just a replacement: IRF9540 for a more powerful and mount it on a heat sink or the side of the box that puts everything inside? Can't you start there and then expand the possibilities according to the previous speaker's wishes? Also: If you are a "fan" of old linear PSU instead of modern Switched: Is it enough with a transformer of 150-200 VA + a rectifier bridge and a smoothing capacitor or do you need stabilization as well? Weller RT U series of soldering tips fit just as well in the 3.5 mm jack as RT P and RT M. Then someone here attached  a modified downloadable code but now it's gone - why?

Dear Tarsonis, thank you for your interest. The small pin-diode based detector was used mostly for illustrative putposes and that the students could experiment with a detector that resembles the HPGe detector, which was used to analyse the dried mushrooms the pupils sent back to us.  Some of the results are available in the nucelar physics news link http://doi.org/10.1080/10619127.2019.1603559 which is already given in another comment and there is a conference report forthcoming.