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Hello, my name is Sergio Ruppel, from Argentina. Currently building the electron detector. Im having real trouble to find the right op amp, since it's not even imported right now, i used the cheaper TL082, as it seems it's only short in the Slew rate compared to the recomended one, but did my own PCB design as small as possible and im not getting any good measurement.. testing with Potassium from bananas, but about to buy KCL today or tomorrow. Could it be that the Op Amp is actually bad for that purporse? I'm mising something more important? |
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Replies: 1 comment
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Hi Sergio, that's really annoying if you can not get all the parts. The slew rate and bandwidth of teh op amp do not really matter. Important are low current noise and low voltage noise figures, high-impedance and low-capacitance JFET or BiFET style inputs. I would highly advise that you build my original detector design exactly as it is first before making your own. You can forget about measuring bananas. No cheap detector is able to do that. The youtube videos claiming that are all wrong and simply measure radon and cosmic radiation! I recommend getting some vintage uranium glass from a local flea market or eBay if you can. It is much easier to measure. |
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Hi Sergio,
that's really annoying if you can not get all the parts.
But the TL082 should still work. I recommend the TL072 as an alternative to the more expensive but nicely low-noise TLE2072. The differences between TL07 and TL08 series are not so significant. A few pulses may be hidden in noise, but if you still use only 4 diodes it should be ok (more diodes in parallel = more noise).
See here for some component alternatives:
https://kitspace.org/boards/github.com/ozel/diy_particle_detector/electron-detector/
The slew rate and bandwidth of teh op amp do not really matter. Important are low current noise and low voltage noise figures, high-impedance and low-capacitance JFET or BiFET styl…