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Group Information

  • Members: 937
  • Category: Physics
  • Founded: Jul 17, 2003
  • Language: English
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Activity within 7 days:

4 New Members - 100 New Messages - New Questions

Description

Welcome to the Alpha Beta Gamma Society.
This group is for amateurs intersted in building, collecting, repairing, modifying, discussing, and learning about Geiger Counters and other Radiation measuring equipment. We often stray into Electronics, Radio, Astronomy, Optics, Microscopy, and many other aspects of measuring or exploring the Physical Universe.

Most Recent Messages

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Re: PM1703M Sensitivity
Mine is sensitive to battery voltage. When the battery goes low but there is no indication of a low battery yet, I start getting intermittent alarms. Cold
Posted - Sun Jan 3, 2010 12:58 am
 Captain Electron
captainelectron
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Re: The AVRMCA project
You should try an emitter-follower in the first stage. It has no V-gain, but has high input impedance and low output impedance. Perhaps mount this first stage
Posted - Sat Jan 2, 2010 11:21 pm
 saipan59
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Re: The AVRMCA project
More tests done today: .- The NPN transistor as first stage seems to works really nice. Gain, bandwidth and signal inversion in a single stage. The problem
Posted - Sat Jan 2, 2010 10:58 pm
 Miguel A. Vallejo
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Re: The AVRMCA project
Indeed, The output of a NaI(Tl) scintillator is about 230ns. this is pretty much the same regardless of amplitude. This total energy is integrated along with
Posted - Sat Jan 2, 2010 9:05 pm
 robert8rpi
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Re: The AVRMCA project
Miguel, The pulses from the PMT +scintillator are the same as you suspect. They have a rise time of about 1 ns and a decay time of micro seconds to a
Posted - Sat Jan 2, 2010 8:12 pm
 EJ
aelectronjocky
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Message History

Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
2010 20
2009 254 291 362 256 237 188 417 395 389 513 308 278
2008 258 374 359 380 529 169 332 227 288 152 127 135
2007 212 218 431 410 422 179 216 214 294 179 182 121
2006 89 133 189 85 105 126 127 167 171 309 181 251
2005 385 327 282 194 152 159 175 580 274 291 215 144
2004 155 188 186 123 127 117 180 276 236 238 177 152
2003 49 73 41 120 53 43
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