Search found 994 matches

by mightyohm
Tue Apr 23, 2019 9:24 am
Forum: Geiger Counter
Topic: How does he INST mode work?
Replies: 1
Views: 31

Re: How does he INST mode work?

INST mode reports counts per minute based on taking the number of counts over the last second and multiplying by 60. Unlike the other modes, there is no averaging of counts over multiple seconds.
by mightyohm
Thu Apr 11, 2019 1:42 pm
Forum: Geiger Counter
Topic: Programming the ATTiny2313
Replies: 1
Views: 286

Re: Programming the ATTiny2313

The source code is not compatible with Arduino. You'll need avr-gcc (WinAVR is no longer being actively developed but last time I checked I was still able to download and install it) and an AVR programmer like the USBTinyISP. Windows 10 may have some problems with drivers, since WinAVR is quite old ...
by mightyohm
Fri Mar 29, 2019 3:30 pm
Forum: Geiger Counter
Topic: Mightyohm Geiger counter online (via serial com port)
Replies: 7
Views: 13399

Re: Mightyohm Geiger counter online (via serial com port)

Bob,

Sorry I can't help you, I'm not familiar with rrdtool either.
by mightyohm
Mon Mar 11, 2019 8:44 am
Forum: Geiger Counter
Topic: Sensitivity Adjustment
Replies: 8
Views: 1817

Re: Sensitivity Adjustment

Now I understand what you are trying to do. Geiger tubes aren't designed to work in this way, but you can try reducing the voltage to the tube - at some point the sensitivity will start to drop off. You can try adjusting VR1, but most likely you'll have to increase R8 as well. You could replace R8 w...
by mightyohm
Fri Mar 08, 2019 10:23 am
Forum: Geiger Counter
Topic: General info
Replies: 1
Views: 1086

Re: General info

with batteries: 138g
without batteries: 116g

both include the case and tube. Removing the case will save about 60g.
by mightyohm
Fri Mar 08, 2019 10:20 am
Forum: Geiger Counter
Topic: Sensitivity Adjustment
Replies: 8
Views: 1817

Re: Sensitivity Adjustment

Try a SI-3BG tube - it's much less sensitive than the SBM-20 and there are lots of them on eBay. Alternatively you can place some shielding around the SBM-20.
by mightyohm
Tue Mar 05, 2019 5:56 pm
Forum: Geiger Counter
Topic: Sensitivity Adjustment
Replies: 8
Views: 1817

Re: Sensitivity Adjustment

Are you trying to increase or decrease sensitivity?
by mightyohm
Mon Mar 04, 2019 9:00 am
Forum: Geiger Counter
Topic: Sensitivity Adjustment
Replies: 8
Views: 1817

Re: Sensitivity Adjustment

I can think of a few ways to do this: ⋅ Change Geiger counter tubes based on what you are trying to measure. Tubes with a larger cross section will be more sensitive. Tubes with a thinner wall or constructed with materials that pass more and lower energy radiation (like mica windows) will ...
by mightyohm
Sat Feb 16, 2019 2:33 pm
Forum: Geiger Counter
Topic: Powering Multiple Units
Replies: 1
Views: 1960

Re: Powering Multiple Units

I don't think this should be a problem. What is your power supply?
by mightyohm
Sat Feb 16, 2019 2:32 pm
Forum: Geiger Counter
Topic: Homemade GM tube
Replies: 7
Views: 4346

Re: Homemade GM tube

Antonio,

That is very cool, thanks for sharing an update on your progress!

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