Search found 6 matches

by TimeWaster
Fri Sep 21, 2012 5:25 am
Forum: Geiger Counter
Topic: FJN3303F
Replies: 12
Views: 27358

Re: FJN3303F

i have used a kit i bought from your website, so all the right components. my perfboard is as small as possible, which could be a problem. i never put my finger ON the board, only hovering over it. because of the problems i had with this circuit i built another circuit found on another page. i thank...
by TimeWaster
Thu Aug 30, 2012 2:13 pm
Forum: Geiger Counter
Topic: FJN3303F
Replies: 12
Views: 27358

Re: FJN3303F

i now rebuild the circuit on a perfboard. result: - the voltage is very hard to adjust (i'm adjusting after CPM since my 1Gohm resistor will take a couple of days to ship). there is a range where the CPM is alright, but it is only 1 degree of angle on the variable resistor, if i only twist slightly ...
by TimeWaster
Wed Aug 29, 2012 4:56 am
Forum: Geiger Counter
Topic: FJN3303F
Replies: 12
Views: 27358

Re: FJN3303F

hm... i ordered a kit from your site, build it on a breadboard, fed it 5 volts and must say i am confused. i rechecked the circuit three times, i am positive that it is correct. no matter if i set R5 to 1K and R6 to 330 or R5 to 330 and R6 to 1K, i never get more than 311 volts. (variable resistor o...
by TimeWaster
Wed Aug 01, 2012 12:41 pm
Forum: Geiger Counter
Topic: FJN3303F
Replies: 12
Views: 27358

Re: FJN3303F

don't you think correcting the schematic would be good for users who want to recheck their pcb?
by TimeWaster
Wed Aug 01, 2012 8:14 am
Forum: Geiger Counter
Topic: FJN3303F
Replies: 12
Views: 27358

Re: FJN3303F

thanx for your answer!

in the schematic (http://mightyohm.com/files/geiger/geiger_sch.png) R5 is already at 1K, but R6 is only at 330, did you mean R6?
by TimeWaster
Tue Jul 31, 2012 1:32 pm
Forum: Geiger Counter
Topic: FJN3303F
Replies: 12
Views: 27358

FJN3303F

hi, i have already build a Geiger counter out of an Arduino Uno, a Geiger counter shield and many other parts (GPS, SDCard an so on), but i have problems with the voltage of the counter shield, so i want to build this part from scratch. The layout of http://mightyohm.com/blog/products/geiger-counter...