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Member Since: March 9, 2009

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  • It is not mentioned here, but you need a walwart of “A supply voltage of [VREG (typical) + 0.3V] to 6V is recommended”. (from Page 11 of the MCP73831T datasheet) There is a schottky diode in series with the barrel jack connector so, in this case, the voltage range for the walwart is [VREG(typical) +.5V] to 6.2V, (assuming Diode Vf = .2V).

  • It is not mentioned here, but you need a walwart of “A supply voltage of [VREG (typical) + 0.3V] to 6V is recommended”. (from Page 11 of the MCP73831T datasheet) There is a schottky diode in series with the barrel jack connector so, in this case, the voltage range for the walwart is [VREG(typical) +.5V] to 6.2V, (assuming Diode Vf = .2V).

  • For the soldering clases, do you need to pre register with Sparkfun?, what is the cost?

  • Thanks Nate for sticking with it.

    Also thanks for demonstrating to the old folks that new and unconventional works just fine!!

  • I bought the previous version and commented about the HV regulation and the Geiger tube output signal processing . I would like to retrofit my older version to this one, any idea when the revised schematic will be posted?

    Also, I did not checked the posted firmware, is it the current one?

    I know you guys are busy… Merry Christmas!!

  • Any plans to add a usb port? It would make a great datalogger…..

  • On the Digital Output section of your tutorial, doesn’t the addition of a 4.7uF cap at the output of Q4 really blocks the detection of additional pulses?

    The scope waveform shows multiple pulses occurring on a 100 ms division. If you can only output one pulse every 5 or six tube pulses….

  • So, if I understand correctly, you do not need to have the actual LabView program, that’s where the LabView Student edition DVD’s come into play?

  • spacing between pins?

  • Maybe a picture of the connector needed or is it wireless?, maybe a view of a battery access or is it powered by some other means?

No public wish lists :(