GQ Electronics Technical Support Forum Active Users: / Visits Today:
Highest Active Users:
GQ Electronics Technical Support Forum
Home | Profile | Register | Active Topics | Members | Search | FAQ
Username:
 Password:
Save Password
Forgot your Password?

 All Forums
 GQ Electronics Forums
 2.GQ Geiger Muller Counter
 Pulse output voltage of GMC-320+		  New Topic  Reply to Topic
 Printer Friendly
Author Previous Topic Topic Next Topic  

delf

USA
3 Posts
Posted - 04/12/2015 :  18:20:27  Show Profile  Reply with Quote
I found that I cannot detect the pulse output of my 320+ with a third party application using their audio input/USB cable as the output voltage of the pulse is only -1v as seen on my scope. The cable is expecting about a -5V pulse. I verified that a CDV-700 works fine with the application as it produces a -10v pulse.

Is there a point on the 320's circuit board where I can tap into for a higher pulse output? If this is not feasible, is there a way to boost that pulse externally (op amp?)

Does anyone know what the pulse voltage is for the GMC-080 kit? If it's -5v, that would be a good alternative as I really just want a dedicated device for the application and would like to free up the 320 for other purposes.

Thanks,
Delf
Edited by - delf on 04/12/2015 19:27:32
Reply #1

delf

USA
3 Posts
Posted - 04/12/2015 :  19:08:02  Show Profile  Reply with Quote
Update: I thought I had found the answer to my issue at this link: http://www.gqelectronicsllc.com/forum/topic.asp?TOPIC_ID=3407
but alas that was for the GMC-080 and doesn't correlate to the 320+. Is there a comparable mod for the 320+?

Thanks,
Delf
Go to Top of Page
Reply #2

ZLM

1261 Posts
Posted - 04/19/2015 :  09:34:05  Show Profile  Reply with Quote
It is similar.

But GMC-320 uses resistor instead of diode.

Remove the R2 you will get a 3.3V pulse.

You also can get the signal from pin 7 of U3. Then you can make any voltage pulse externally by adding just one resistor.

See:

Image Insert:

24.33 KB
Go to Top of Page
  Previous Topic Topic Next Topic  
 New Topic  Reply to Topic
 Printer Friendly
Jump To:
GQ Electronics Technical Support Forum © Copyright since 2011 Go To Top Of Page
Generated in 0.06 sec. Snitz's Forums 2000