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 2.GQ Geiger Muller Counter
 Pulse output voltage of GMC-320+

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T O P I C    R E V I E W
delf Posted - 04/12/2015 : 18:20:27
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
2   L A T E S T    R E P L I E S    (Newest First)
ZLM Posted - 04/19/2015 : 09:34:05
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
delf Posted - 04/12/2015 : 19:08:02
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

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