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 2.GQ Geiger Muller Counter
 Get a Logic Pulse out of a counter for each Count?		  New Topic  Reply to Topic
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ullix

Germany
1240 Posts
Posted - 01/27/2026 :  09:00:06  Show Profile  Reply with Quote
Particularly from a GMC-800? Preferentially the Logic-Pulse should have 3.3V, active Hi, Pulse Width 100...150 µs.

I am prepared to solder a connection onto the board!
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EmfDev

2384 Posts
Posted - 01/27/2026 :  15:52:17  Show Profile  Reply with Quote
middle pin of LED but it is active low and is an open collector when not active.
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ullix

Germany
1240 Posts
Posted - 01/28/2026 :  03:15:24  Show Profile  Reply with Quote
Thx! The only LED I see is a 2-color LED with 4 pins, which makes it difficult to find the middle one ;-)

But on testing the 2 outer pins seem to carry the same signal. This is an active Low of 2.0V and a width of 720#181;s.

Are you sure this is the signal for counting? Because its lenght limits any counter to 1 / 720 #181;s or below CPS=1389, CPM=83333?
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