Search found 4 matches

by pepsiplease69
Sat Feb 16, 2019 1:22 pm
Forum: Geiger Counter
Topic: Geiger Counter not working
Replies: 8
Views: 1779

Re: Geiger Counter not working

Hello Jeff, Problem has been solved! Thanks for your support. I checked the voltages again on the 555 timer pins 3 and 2, it was 3V and 0V respectively. I also checked the voltages across R5, D2, C3, and R9 as per your instructions. All of them were showing 0V across. So I started working on the 555...
by pepsiplease69
Fri Feb 15, 2019 1:07 pm
Forum: Geiger Counter
Topic: Geiger Counter not working
Replies: 8
Views: 1779

Re: Geiger Counter not working

Direction of D2 seems correct. I have also re-checked the solder points for R6, D2, R9, C3, and U1. There seems to be a good amount of solder on the contacts.

Please see images.

09E30383-842C-496F-830A-A9CEDEB03B5E.jpeg


44BFB134-B612-4550-83AD-96DC46CDB8F7.jpeg
by pepsiplease69
Tue Feb 12, 2019 2:36 pm
Forum: Geiger Counter
Topic: Geiger Counter not working
Replies: 8
Views: 1779

Re: Geiger Counter not working

Oh and by the way, I do have a radioactive object which should generate a signal (aside from the background noise).

I am using a Pentax SMC Takumar 50mm lens as the radiation source.

When I put its rear element next to the GM tube, nothing happens.

Thanks.
by pepsiplease69
Tue Feb 12, 2019 2:34 pm
Forum: Geiger Counter
Topic: Geiger Counter not working
Replies: 8
Views: 1779

Geiger Counter not working

Hi, I recently purchased a geiger counter kit from Adafruit and put it together but it doesn't seem to work properly. I'm not getting any signals. I checked all the solder points and they seem okay. I tried to short the TP1 pad with the ground pin in the pulse J6, i'm able to get a signal both on pi...