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Registered Member #96
Joined: Thu Feb 09 2006, 05:37PM
Location: CI, Earth
Posts: 4061
That might be the problem, have you checked the gain on the BC550B?
Often with these oscillator circuits subbing parts will result in a non working circuit or one which draws excess current.
Also, the transistor on the coil itself is rated for much higher voltages than a "jellybean" transistor. Your substitution has a Vmax Vceo of 45V so at best you will get a fraction of the desired voltage.
Registered Member #2893
Joined: Tue Jun 01 2010, 09:25PM
Location: Cali-forn. i. a.
Posts: 2242
Here's an idea that will save you a lot of headache. Do you happen to have any CCFL inverters on hand? If you connect a voltage doubler to them and power them via an adjustable supply such as the lm317 you can get a variable voltage power source, excellent for a geiger tube. This one only draws 13mA so it runs off of a 9V battery just fine.
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Geigercounter problem
