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NER10 X-Ray generator

I’ve bough from eBay a NER10 X-Ray generator tube. It was build in 1925-1930 I don’t know exactly when. It’s interesting to see how well…

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PRT-E750W & PRT-E1500W vfd settings

How to set correctly the PRT-E750W and PRT-E1500W  (are equals except for the power capability) VFD supplied with CNC 3020 and CNC 6040 chinese routers….

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Radioactive sources

This is my actual collection of radioactive sources. Thorium Kodak lens Kodak had made some 35mm analog film models of cameras (1950-1970) like Retina IIIc,…

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MadEXP PMT Adapter v2.0 schematic/gerber files plus license. Click on the link to download. MadExp PMT MadEXP PMT Adapter v2.5 schematic/gerber files plus license. Click…

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Z80 Single Board Computer

This is my first didactic 8bit – Z80 based computer. I’ve made it because I was interested into homebrew a working computer from TTL chips…

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MS-4 γ-selective Geiger counter

This is a γ-selective Geiger counter from the “M” professional serie used also in demonstration devices for measuring the age of minerals by the activity…

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This is equivalent to SBM20 Tech. spec.: ·Radiation determine: beta ( > 0.25 MeV) ; gamma soft/hard ·Voltage of start of counting: 280 – 330…

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AC-1 High-sens β-selective Geiger counter

This tube is very hard to find. It’s made from alluminium and glass and is a β-selective Geiger counter. It’s counts only beta’s! Tech. spec.:…

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SBM-21 Micro geiger tube

This is the smalles geiger tube I could find. It’s so cute but… so insensitive to the background. It’s a good tube to build around…

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SBM20 The quintessential russian geiger tube.

The SBM20 is the most produced of the russian geiger tubes. Probably it’s also the most produced tube in all world. It’s characteristics and cheapness…

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