Mr Blinky

I wanted to see if there was much difference between the sensitivity between a SBM-20 and STS-5 tubes. For a background test I had an SBM-20 running for a while then swapped it for a STS-5. I think the graph says it all. (Note - there was a discrepancy with the initial background test (below). The test was repeated later and the results are shown towards the end.) I took this a step further and compared the two tubes using 13 different sources. In hindsight I should have tested a J305 at the same time. It took a surprisingly long time, so I might set up some kind of testing jig and program an

It seems of late that getting hold of good GM tubes, for reasonable money is a thing of the past. A single SBM-20 on eBay is going for in excess of £150 ($182) and there are hardly any suppliers left for them. Some years back I paid about £13 for a NOS SBM-20. I wish I had the nous back then to buy a large stock of them. I'd have made good money these days! eBay used to be awash with good GM tubes. Lots of regular types, SBM-20, STS-5, LND-712, SBT10A, SBT11A, pancakes, a bunch of Mullard and then a load of quite exotic tubes. Today there is hardly any of those and is covered with cheap

If you are interested in Chernobyl you will love this video. I had only heard of SKALA in the past, but nothing actually about it. This video gives a really good look into SKALA and it's operations. In this episode of Computers of Chornobyl series, we will talk about the mighty SKALA system, that controlled the RBMK reactors. This is the first-ever documentary about its design, architecture, operation, and software. It also tells the story of how it was preserved for posterity and reveals, what is common between it... and a control computer of Apollo spacecrafts. It took us nearly half a year

I bought one of these cases from my local Asda for about £14 a few years back. I thought it was that good I went back a week later and they had sold out and they never came back into stock again. I had a little search about on the internet and found them on eBay and Amazon - links below. I bought one from eBay to see if it was the same quality, and it is exactly the same. It is a really neat case. Appears to be very waterproof, even air tight and strong. I think it is made from Polycarbonate. I used mine to house a GPS Geiger counter project some time ago. I think I will use another for an

For all of the posts in the Negative Ion Energy Ju-Ju series, click here. I found a new variation of the pendant. A white Ju-Ju pendant. I think there are loads of variations but this seems a new one. I have one on the way so will let you know about it when it arrives. https://www.aliexpress.com/item/4000030351480.html Update: It has landed! This is the latest Negative Ion Energy Ju-Ju pendant. It's kind of pretty. File Attachment: It has some extra goodness on the back - some Germanium stone and FIR stone little dot kind of things. One of the previous stone coloured pendants has 4 little dot

I was asked by Gissio to try and download the original firmware from my HFS-P3, so I tried. Alas, no joy so far. ☹️ Under the battery (stuck down with sticky tape) is a pin header. Probably designed to have a pogo pin connector connect to it as there is no room to solder on an actual pin header. I just soldered wires to it directly. I managed to work out the pins by tracing the circuit, but I had to use my microscope as the connections on the MCU really are that small! I took photos of both sides and flipped one then overlaied one over the other so I could line up the vias on the board. You

Early afternoon and I hear a mighty humming noise. A swarm of bees had come to visit! 😊 After I had run around the house closing the windows I caught a bit on video. I've never been this close to a swarm of bees. Being behind a window was great as they were super close. I did consider going outside but they moved off shortly after filming them. They also came back a few hours later but didn't hang around and I didn't get my camera in time. I think they may have been mating as there seemed to be two swarms which you can't really see on the video, but that is the reason I moved the camera from

I have been trying to find info on this tube since I got my HFS-P3 Chinesium pen counter, with little to no avail. By chance, a new user to radmon.org (gissio - welcome!) has already found the info and manufacturers website so I have compiled an English version datasheet for this tube (below). Many thanks to gissio for the info! ( https://github.com/Gissio/fs2011pro/tree/main/docs/tubes ) The HH614 is a new tube to the market, released in June 2022. It's quite compact but the size does limit it's sensitivity somewhat. It's gamma sensitivity is 10 CPS/mR/hr compared to the SBM20 at 22

For all of the posts in the Negative Ion Energy Ju-Ju series, click here. 'Ponit' !!! LMAO 🤣 I think that should be 'Point'... Yes, another potentially dangerous Ju-Ju device. Thanks to FSM19 for pointing me to this. It is rather interesting. It comes in a little black cardboard case but sadly no authenticity card. It does have a little leaflet inside (below) with the usual bullshit and spelling/grammar errors to boot. The text isn't even complete and ends with 'and improves nutrient take up by the' and that is it! Muppetry at it's finest. 😂 Its a very interesting piece. Much like all of

For all of the posts in the Negative Ion Energy Ju-Ju series, click here. Round three, four, five? Of Quantum Energy Thorium Radiation Ju-Ju FIR Energy Stuff That Will Not Do You Any Good! Yay! 😄 The more you look for these things, the more you find. It's insane! And I bought some. A pretty glass pendant and a lovely set of a pendant and plastic card. And the glass pendant and plastic card are considerably hotter than the previous pendants. All bought from Ali Express and all containing Thorium. Here are my findings. I messed up with the camera again, a bit, and there wasn't enough light so I