Search found 237 matches

by richnormand
Wed Feb 01, 2006 12:38 am
Forum: Neutrons, Radiation, and Detection (& FAQs)
Topic: Radon detector for under $100.00
Replies: 50
Views: 11392

Re: Radon detector for under $100.00

They are shiiping "my" unit tomorow.
by richnormand
Tue Jan 31, 2006 12:45 am
Forum: Neutrons, Radiation, and Detection (& FAQs)
Topic: Radon detector for under $100.00
Replies: 50
Views: 11392

Re: Radon detector for under $100.00

OK too late!
Just purchased one unit and I'll run the experiment.
Fun fun fun...
by richnormand
Mon Jan 30, 2006 11:55 pm
Forum: Neutrons, Radiation, and Detection (& FAQs)
Topic: Radon detector for under $100.00
Replies: 50
Views: 11392

Re: Radon detector for under $100.00

<t>Very neat device for the price.<br/> <br/> Have you considered putting the unit in a sealed box with one of your ore samples and see if its radon indication will actually go up? If the ore radiation upset it a simple two box setup with a connecting tygon tube between the two might do it? Same wit...
by richnormand
Sat Jan 21, 2006 3:51 am
Forum: Neutrons, Radiation, and Detection (& FAQs)
Topic: Canberra Series 30 MCA
Replies: 10
Views: 4289

Re: Canberra Series 30 MCA

<t>The start circuit activates the buss. After that all the others are referenced to the stabilised 30V, if I remember correctly. remove all loads and get it running.<br/> <br/> In other words:<br/> <br/> "Fix the PS board first to specs before anything else...."<br/> <br/> <br/> Brian Willard wrote...
by richnormand
Fri Jan 20, 2006 2:54 am
Forum: Neutrons, Radiation, and Detection (& FAQs)
Topic: Canberra Series 30 MCA
Replies: 10
Views: 4289

Re: Canberra Series 30 MCA

<t>I would first remove all loads including the CRT assembly. If you read my previous post, the start circuit was bad with dead electrolytics. Then follow the +30V supply and work your way through to all the others. Pass transistors, zeener diodes and 741 op-amps were most of the trouble. Pays to be...
by richnormand
Tue Jan 17, 2006 12:12 am
Forum: Neutrons, Radiation, and Detection (& FAQs)
Topic: Canberra Series 30 MCA
Replies: 10
Views: 4289

Re: Canberra Series 30 MCA

<t>Looks like mine was from a undergrad university lab populated with all the dead boards they had and then stored outside. That is why I stressed the need of a good scope and curve tracer to fix stuff……<br/> <br/> Quite a learning experience, I might ad. It was a cheap $50 on e-bay so I should not ...
by richnormand
Sun Jan 15, 2006 4:22 pm
Forum: Neutrons, Radiation, and Detection (& FAQs)
Topic: Canberra Series 30 MCA
Replies: 10
Views: 4289

Re: Canberra Series 30 MCA

<t>I have some (if not most) of the service diagrams for that unit if you are interested (not the user manual). makes a book about 2.5cm thick. <br/> <br/> My e-bay unit was also dead when I got it and most of the issues were pass transistors, 714 op-amp and electrolytics in the power supply. In par...