Search found 970 matches

by mightyohm
Sun Jun 17, 2018 9:24 pm
Forum: Geiger Counter
Topic: voltage problem Geiger Counter
Replies: 2
Views: 117

Re: voltage problem Geiger Counter

That all sounds fine. If I measure the HV test point with my Fluke 87 V alone (no resistor), I measure about 215V. This is when VR1 is properly adjusted for 400V as measured with a Gigaohm resistor in series with the DMM.
by mightyohm
Wed May 16, 2018 9:13 am
Forum: Geiger Counter
Topic: Replacement Tube / Arrived Damaged
Replies: 3
Views: 594

Re: Replacement Tube / Arrived Damaged

It takes quite a bit of force to break the wire, so it should be easy to fix. Let me know if you have any other problems and I hope you enjoy your kit!
by mightyohm
Mon May 14, 2018 4:27 pm
Forum: Geiger Counter
Topic: Replacement Tube / Arrived Damaged
Replies: 3
Views: 594

Re: Replacement Tube / Arrived Damaged

Brenton, Sorry to hear that! The end caps do separate from the body of the tube occasionally. If the wire soldered to the end cap is still connected, the end cap can be pushed back on and superglued in place. You can also contact Adafruit support. In most cases they will arrange for a replacement tu...
by mightyohm
Wed May 02, 2018 3:09 pm
Forum: Wifi Radio Project / Hacking the Asus WL-520gU
Topic: I can not hear if I try the URL
Replies: 3
Views: 1154

Re: I can not hear if I try the URL

Great to hear! Good luck with your project.
by mightyohm
Mon Apr 30, 2018 6:18 pm
Forum: Wifi Radio Project / Hacking the Asus WL-520gU
Topic: I can not hear if I try the URL
Replies: 3
Views: 1154

Re: I can not hear if I try the URL

It sounds like your DNS server settings are not working. Check the address of your nameserver in part 4.
by mightyohm
Mon Apr 23, 2018 9:47 am
Forum: Geiger Counter
Topic: No signal from my geiger tube
Replies: 3
Views: 652

Re: No signal from my geiger tube

Check out my Geiger counter kit: http://mightyohm.com/geiger I sell a minimal version of the kit that includes a high quality PCB and all electronic components needed to build the kit. You can supply your own case and SI-3BG, SI-1G, SBM-20 or CTS-5 Geiger tube. It would be useful to have this kit as...
by mightyohm
Sat Apr 21, 2018 10:16 pm
Forum: Geiger Counter
Topic: No signal from my geiger tube
Replies: 3
Views: 652

Re: No signal from my geiger tube

Have you verified that your high voltage supply is working and the voltage is correct?
Do you have a radioactive sample for testing or are you relying on background radiation?
by mightyohm
Mon Apr 02, 2018 3:14 pm
Forum: Geiger Counter
Topic: rugged case
Replies: 1
Views: 611

Re: rugged case

Greg, Plastic will shield some radiation from reaching the tube, particularly beta particles. Thicker plastic will have more shielding effects, so I'd use thin low density plastic where possible. If you're mainly interested in observing trends, this may not be an issue as it's the change in measured...
by mightyohm
Wed Mar 07, 2018 11:26 am
Forum: Geiger Counter
Topic: Homemade GM tube
Replies: 3
Views: 1260

Re: Homemade GM tube

Sorry, I don't know the author. I found the page using google search.
by mightyohm
Tue Mar 06, 2018 11:08 am
Forum: Geiger Counter
Topic: HV Circuit
Replies: 5
Views: 1210

Re: HV Circuit

I built and tested the circuit and modified it as needed. I used simulations as well but it was mainly cut and try on the bench.

Go to advanced search