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Hi Anna, The most likely issue is that you are missing a metal box and your soft copper tape solution just isn't equivalent enough to a proper Faraday cage and complete light blocker. If the signal noise won't increase inside a metal box you have a component error, like a broken ceramic capacitor or the amplifier chip (typically gets hot in that case). But that is quite rare. You could also tripple check the values/markings of all yellow ceramic capacitors (in particular C1 and C2) and R3. I've verified the other components via the pictures. I believe you're almost there, good luck. |
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Hi Anna,
thanks for the pictures and detailed report, really helpful for debugging.
Your built looks perfect!
Even the SMD type BPW34S diodes seem to be mounted with the correct polarity.
You've probably seen the troubleshooting guide, right?
https://github.com/ozel/DIY_particle_detector/wiki/Troubleshooting
The most likely issue is that you are missing a metal box and your soft copper tape solution just isn't equivalent enough to a proper Faraday cage and complete light blocker.
If the noise is much lower than +/- 25 mV for the electron detector as in your case, it means the amplifier is oversaturated. Either with electromagnetic radiofrequency waves, light, or both. See the scope screen…