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spenceraxani / CosmicWatch-Desktop-Muon-Detector-v2

The CosmicWatch Desktop Muon Detector supplementary material
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Troubleshooting again #110

Open 0ort9 opened 1 year ago

0ort9 commented 1 year ago

Hello Spencer, I could need some input from your side for one of our non-working main PCBs. TP1 and TP2 show great signals, TP3 shows some weird reversed peak: IMG_20230901_154622 We measured every component after TP2. Is there a way to check if the LT1807 is still working?

spenceraxani commented 1 year ago

Hi,

That’s a new one. I can’t say for sure. Were TP1 and TP2 positive pulses? If TP2 is amplifying the signal, I think it’s a good indication that the LT1807 is working fine. For TP3, you cannot terminate the line to 50Ohms at the input to the scope, otherwise, that additional path to group will cause the pulse to decay away too quickly. You aren’t inverting the pulse on the oscilloscope are you? My recommendation would simply be to reassess your soldering and the components on the peak detector circuit. It’s going to be one of those components causing the problem.

Best,

Spencer

─ Dr. Spencer N. Axani @. @.>

Assistant Professor The University of Delaware 203 Sharp Lab 104 The Green, Newark, DE 19716 (608) 572-8426

On Sep 4, 2023, at 5:41 PM, 0ort9 @.***> wrote:

Hello Spencer, I could need some input from your side for one of our non-working main PCBs. TP1 and TP2 show great signals, TP3 shows some weird reversed peak: https://user-images.githubusercontent.com/96202212/265543642-7b6d44a4-b37e-426d-839d-7d84079e2997.jpg We measured every component after TP2. Is there a way to check if the LT1807 is still working?

— Reply to this email directly, view it on GitHub https://github.com/spenceraxani/CosmicWatch-Desktop-Muon-Detector-v2/issues/110, or unsubscribe https://github.com/notifications/unsubscribe-auth/AANF5O2SJSTO324R7BKYCO3XYZDJLANCNFSM6AAAAAA4K4FLUY. You are receiving this because you are subscribed to this thread.

0ort9 commented 1 year ago

Thank you for the quick response. If i compare TP1 and TP2's peaks I see an amplification of 30 instead of 10, maybe this has to do with the amp circuit after all

spenceraxani commented 1 year ago

Is TP1 by chance terminated to 50Ohms and TP2 not? That would cause a factor of 2x difference between the two.

─ Dr. Spencer N. Axani @. @.>

Assistant Professor The University of Delaware 203 Sharp Lab 104 The Green, Newark, DE 19716 (608) 572-8426

On Sep 5, 2023, at 9:46 AM, 0ort9 @.***> wrote:

Thank you for the quick response. If i compare TP1 and TP2's peaks I see an amplification of 30 instead of 10, maybe this has to do with the amp circuit after all

— Reply to this email directly, view it on GitHub https://github.com/spenceraxani/CosmicWatch-Desktop-Muon-Detector-v2/issues/110#issuecomment-1706656191, or unsubscribe https://github.com/notifications/unsubscribe-auth/AANF5O666CKMSGGSFCQDK4TXY4UKVANCNFSM6AAAAAA4K4FLUY. You are receiving this because you commented.