SparkFun will be closed Nov 26th and 27th for the Thanksgiving holiday. Orders placed after 2:00pm MT on the 25th will ship out Monday the 30th.
Track My Order
Frequently Asked Questions
International Shipping Info
Mon-Fri, 9am to 12pm and
1pm to 5pm U.S. Mountain Time:
Chat With Us
January 19, 2010
about 5 years ago
The video measuring the Voltage on the tube with a 1uF condenser
instead of 10uF in the circuitry of the toggle ramp produces 500V instead of 900 Volts.
Yes , I will do it again on the weekend and send you what tools I used via a video.
Pulses uS/h for LND based on Cs137 and measured in a Lab
Have fun at funspark !
How do you “measure” as this item is only sending zeros and ones via USB to the termial while a particle is flying through it ?
Christine, please make a drawing and make it official her. I will redesign my 2 geigers if necessary.
I was buying 2 of them and I have some comments :
1.) The hardware is ok. But there is a severe issue regarding
the Voltage beein fed into the tube ! I measured 900(!) Volts
with a Fluke Meter and that’s far too high for this LND tube ! LND describes the plateu of the Geiger-Mueller Tube in between 400 and 500 Volts. Higher Voltage will destroy the tube and shorten life dramatically. So I changed the 10 uF Condenser (right one near the diode in front of the transformer) to a value of 1uF and I get 430 Volts, best range for the tune.
2.) The software is ugly ! I expected the values of microSievert/h or the Impulses (counts) per minute or second sent via the USB port. But they send zeros and ones while the tube is affected. Useless as a measuring instrument. I am working on a different processor to bring in with a software sending either the cps periodically or the microSievert/hour also.
No public wish lists :(
Forgot your password?
No account? Register one!