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My Geiger counter doesn’t count (sob sob)

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Atomic.dave
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re: My Geiger counter doesn’t count (sob sob)
Atomic.dave   12/7/2011 8:31:30 PM
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Hello I too have built a chaney kit c6981 with digital display. It seemed to work ok for the most part but it always seemed to have this steady buzz from the piezo. Also noticed that it would go thru batteries quite quickly. I ended up selling it on eBay to a guy in Japan. From there I started off on a journey of building many Geiger kits from a few arduino, a uno based libelium, to a recent cheap 29 dollar one from Electronic goldmine who like Kitusa sells Chaney kits. I bought two as they had a sale for 19 bucks. The first one worked but it had a constant buzz from the piezo. The second one was missing a part which they replaced but I can't get it to work right a the piezo is real quiet. I contacted them but they said that all the geiger (chaney) kits have the same piezo buzz caused by the 9 volt up conversion. They no longer are returning my emails. Anyone care to comment?

Max The Magnificent
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re: My Geiger counter doesn’t count (sob sob)
Max The Magnificent   11/3/2011 3:04:48 PM
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Great advice -- thanks for this tip

Max The Magnificent
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re: My Geiger counter doesn’t count (sob sob)
Max The Magnificent   11/3/2011 3:03:07 PM
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Cool Beans!!!

mebbin
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re: My Geiger counter doesn’t count (sob sob)
mebbin   11/3/2011 12:15:57 AM
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I have the same kit. I use some extra holes and two pcb fuse clips to connect the tube way better than the wire link solution proposed in the instructions.

Anakron
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re: My Geiger counter doesn’t count (sob sob)
Anakron   6/30/2011 1:24:27 AM
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Thank you so much for making this available. I got a new kit today, revision 04/12/11LW, which did something similar. The schemos include a 100R resistor for the LED but everything else is the same. The sensitivity was almost nothing, probably a click every 3 minutes or so. I noticed that if I touched the + end of the tube with a single voltmeter probe, it stabilized and I got actual background level, about 25CPM. To my surprise I had disk shaped 1000pF/500V caps in a drawer (model military suitcase) and fitted one of them standing vertically on the outside of the transformer with one pin to the jumper over to the (middle) case (-) of the GM tube, the other pin along the edge of the board to the cathode of the diode. I also changed R3 to 1MOhm (biggest I had in throughhole). The board now works beautifully with no double clicks. Kent

Max The Magnificent
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re: My Geiger counter doesn’t count (sob sob)
Max The Magnificent   5/24/2011 5:03:13 PM
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David has fixed my Geiger counter -- also he's written a GREAT article describing everything he did (http://bit.ly/jclBdM)

Andresito
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re: My Geiger counter doesn’t count (sob sob)
Andresito   5/24/2011 7:19:58 AM
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AFTER applying Peter's recommendations: MY COUNTER IS WORKING TOO! I'm very happy since I live in Japan. From now on I will check every food&drink before consuming it. (These jerks increased the radiation safety limits here, so literally all contaminated food products are: "Under the safety limit")

gwasik
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re: My Geiger counter doesn’t count (sob sob)
gwasik   5/19/2011 7:35:55 PM
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I have extra components and if anyone would like me to repair or mod theirs, please contact me at my screen name at gmail.com

shiverman
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re: My Geiger counter doesn’t count (sob sob)
shiverman   5/19/2011 6:22:05 PM
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They had the NERVE to tell my payment service that ALL their customers are HAPPY with the design. This blog alone proves they are not truthful. I didn't want to change the design incase they would repair it, but they are doing nothing to help..so if I don't get refunded I'll have to make those changes ( that's if they even return them to me ) *sigh*

pchow
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re: My Geiger counter doesn’t count (sob sob)
pchow   5/19/2011 4:55:38 PM
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Yes, I would have to totally agree, it's really a poor design - but can be salvaged with some simple changes. They should not sell this kit as designed - but I now have a better understand how a Geiger circuit should work after hacking it a bit. Although it's become a quest to get this thing working right. :( I'm aldo curious what David's changes are, which I asssume will be similar to what I've documented at: https://picasaweb.google.com/101778441575121007208/Geiger_chaney6981Modified# The G-M tube is still floating (not referenced to ground, etc.) even in the modified design, but it works. Anyways, even if you had Electronic Goldmine or Chaney Electronics fix the kit, it would not be as reliable as making the necessary design modifications. - Peter

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