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Solid States Devices => Joule Thief => Topic started by: gadgetmall on September 11, 2012, 05:50:20 PM

Title: Geiger Counter DIY Cheap using Disposable Camera Circuit
Post by: gadgetmall on September 11, 2012, 05:50:20 PM
Make a very Sensitive geiger counter with a cheap muller tube from ebay and a disposable camera circuit !

there is an optional part of the circuit you don't need but is just a few more parts a logic level N-fet and a10k resistor are needed for the meter hookup . .the  detector built without those two parts will have audio Clicks like a good detector when radioactivity is detected including background normal in the air particles . .Looking forward to your Builds !! (

thanks to Kirk @ mad Scientist Hut (;;;hash=item41689ba977 (;;;hash=item41689ba977);;hash=item3a79a02478 (

The tubes are on ebay for about 10 bucks more or  less  but the plans call for a russian SBM20 geiger tube which is a bit more ..according to his plans The Russian surplus SBM20 runs fine at 280-500V , so I chose to set my output to ~340VDC because at this level it draws less current from the batteries.

the 10 dollar geiger counter tubes are rated  Working Voltage in pulse mode = 380...460 V and Working Voltage in current mode = 382...398 V  so they should  work fine with this circuit as the only difference is less voltage to run them !

all the parts for this are less than 30 dollars including the tube and the cheap 3 dollar multimeter .
i can show you how the flash unit can also be a fuji instead of the one shown . Very simple modifications .
this probably is not for the unexperienced person .but if you can make a Darlington circuit then this is not that hard and you can use radioshack pcb project boards to solder your components . get a big enuff enclosure and you can put your meter ,speaker and make a tube enclosure out of a piece of pvc  or copper pipe and some hv wire or satellite coax  and you got a nice geiger counter .. Or you can buy a ready made detector for around 160 up . Stay away from the old Victoreen Yellow CD-v717 . It is not a Geiger counter even though it looks like one.

this is info available on the internet and brought to your attention to build one now because radiations is a real problem everywhere from the Japan disaster .

Title: Re: Geiger Counter DIY Cheap using Disposable Camera Circuit
Post by: gadgetmall on September 11, 2012, 08:28:54 PM
If you just want to detect Ion radiation (

a 4 dollar Nuclear rad detector . Not very strong but if you have a good source like an americium dot or a thorium welding rod or an older camping lantern mantel stuck in it you can see it on your meter .