Search found 9 matches

by NGinuity
Tue Nov 15, 2011 11:57 am
Forum: Geiger Counter
Topic: Functional surface mount equivalent for FJN3303F?
Replies: 5
Views: 8547

Re: Functional surface mount equivalent for FJN3303F?

Cool! Please share your design when you're finished, I'd love to see it. Of course! Wouldn't feel right if I didn't. After all, being open source, I'm sure someone would want to mess with the design at some point. I actually didn't change much of your original design. In fact, this was the first fu...
by NGinuity
Sun Nov 13, 2011 9:45 pm
Forum: Geiger Counter
Topic: Variable Resistor
Replies: 2
Views: 5074

Re: Variable Resistor

I checked the BOM here: http://mightyohm.com/files/geiger/geiger_counter_bill_of_materials.pdf It does state that the value is 100 in the BOM, but the description says "Trimmer Resistors - Single Turn 3/8 10ohms 10% 0.5Watts Square" I think it's just a misprint in the BOM because it's in the schemat...
by NGinuity
Sun Nov 13, 2011 1:52 pm
Forum: Geiger Counter
Topic: Functional surface mount equivalent for FJN3303F?
Replies: 5
Views: 8547

Re: Functional surface mount equivalent for FJN3303F?

You could ask Duane what he is using in his SMT version: http://blog.screamingcircuits.com/2011/08/open-source-the-eskimo.html The STL128DN looks like a really good substitute for the FJN3303. I think it's definitely worth trying out. If you're going to be playing with the HVPS it is really helpful...
by NGinuity
Sun Nov 13, 2011 2:15 am
Forum: Geiger Counter
Topic: Functional surface mount equivalent for FJN3303F?
Replies: 5
Views: 8547

Functional surface mount equivalent for FJN3303F?

As some of you know, I'm turning out a design for a totally surface mount model of the geiger counter and running into a little trouble finding a functional replacement for the FJN3303F (it only comes in a TO-92 Package). So far, the closest match I can find is the STL128DN: http://www.st.com/intern...
by NGinuity
Sun Nov 13, 2011 2:08 am
Forum: Geiger Counter
Topic: Why the preference of the SBM-20?
Replies: 18
Views: 23611

Re: Why the preference of the SBM-20?

Thanks, I will design this into my surface mount design as a capable alternative. I'm almost there!
by NGinuity
Tue Sep 27, 2011 9:35 am
Forum: Geiger Counter
Topic: Why the preference of the SBM-20?
Replies: 18
Views: 23611

Re: Why the preference of the SBM-20?

Awesome. Let me draw something up and get a dorkbot order in and I will report back my findings!

Question, I assume that the second contact goes on the large flat surface on the backside of that tube, correct?
by NGinuity
Mon Sep 26, 2011 9:19 am
Forum: Geiger Counter
Topic: Why the preference of the SBM-20?
Replies: 18
Views: 23611

Re: Why the preference of the SBM-20?

I had come across the GStube website already, and I agree, it's a excellent reference. I agree that the SBM-20 is the ideal candidate, but I was just hopeful :-)
by NGinuity
Sat Sep 24, 2011 12:37 pm
Forum: Geiger Counter
Topic: Why the preference of the SBM-20?
Replies: 18
Views: 23611

Re: Why the preference of the SBM-20?

Well, really, I was just exploring the other tubes you've designated on the board in the course of learning. I want to build a few of the units as is, but I'd really like to design (or see one designed) a board that would fit inside of the footprint of an Altoids tin (I have a friend who shipped me ...
by NGinuity
Sat Sep 24, 2011 11:46 am
Forum: Geiger Counter
Topic: Why the preference of the SBM-20?
Replies: 18
Views: 23611

Why the preference of the SBM-20?

Hey Jeff,

Just wondering why you prefer the SBM-20 over the other tubes that might be used in your design. Any loss of functionality by using others? I notice they are glass in nature, but can't seem to figure out the differences otherwise besides form factor.

-Eric