Hi everyone,
I've seen that some of you are experienced with geiger tubes, could someone help me plz ?
I bought a geiger tube (CTC-5) some weeks ago and tried to connect it properly:
I downloaded the datasheet and made my own circuit:
I'am using a 4.5V battery, which is boosted to 5V then to 380V;
then i connected a 6,8 Mohm resistor (R1), my geiger tube, then a 100k resistor (R2) and back to the ground.
With an oscilloscope, i checked the signal between R2 and the ground: where i should get sometime 5V , i have nothing.
I tried to replace short-circuting my tube by connecting R1 to R2, and then i get my 5V signal.
I tested my circuit with another tube, and i still have the same problem.
Is there something wrong i'm doing ?
Thanks,
No signal from my geiger tube
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?
Do you have a radioactive sample for testing or are you relying on background radiation?
Jeff Keyzer
http://mightyohm.com
http://mightyohm.com
Re: No signal from my geiger tube
Yes, i checked my voltage (i had to adjust it) with 2 different multimeters.
Is there a chance the current is too low ?
I used a radioactive source, but nothing more happenened.
I borrowed a SBM-20 and nothing happened too: I'm desperate :'(
Any other way to check if my tube is functional ?
Is there a chance the current is too low ?
I used a radioactive source, but nothing more happenened.
I borrowed a SBM-20 and nothing happened too: I'm desperate :'(
Any other way to check if my tube is functional ?
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 a "known good" circuit for testing, and if you have any problems with the kit I can provide support.
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 a "known good" circuit for testing, and if you have any problems with the kit I can provide support.
Jeff Keyzer
http://mightyohm.com
http://mightyohm.com