lon:-64
lon:-64


Author Comment Last activity Moderation
bhamster "Thanks @Ag8n! I ended up using a lens from an old laser pointer after discovering that the CD/DVD drive lens was really small (only a couple millim..." | Read more » 2 months ago
Ag8n "Very impressive! Which plastic lens did you use? The one from the computer drive or the one from a laser pointer? Thank you!! " | Read more » 2 months ago
bhamster "I did this! Here's a photo of my microscope in action (without the smartphone, because I needed it to take the photo...). The tiny yellow-ish spec..." | Read more » 2 months ago
Ag8n "Interesting. We would do some of the individual tests, for example oil and grease. These were only done for a short period of time ( a year or tw..." | Read more » 2 months ago
alejobonifacio "wow! I saw the video! It is very interesting how she uses transparent plastic as a slide and coverslip. " | Read more » 2 months ago
Ag8n "Found another good example. It's from six years ago on the PBS series "Gross science". The title on youtube is "See microbes with this DIY phone ..." | Read more » 3 months ago
liz "@bronwen Check this out! " | Read more » 3 months ago
Ag8n "Very helpful video on the lens removal. Thank you. " | Read more » 3 months ago
Ag8n "Yes, that did it! Thank you very much. Only did a quick once over of the diagrams. It looks like they take the focusing lenses out of a CD drive ..." | Read more » 3 months ago
alejobonifacio "Thanks for let me know. Please try with this link... https://www.researchgate.net/publication/343539752_Micro-Hoek_Manual_de_Construccion " | Read more » 3 months ago
Ag8n "Having trouble with the "digital manual of construction in spanish". For whatever reason, the link doesn't work here. Could you please post the i..." | Read more » 3 months ago
xose "Añadir clavija al sensor Coqui para grabar las mediciones: https://publiclab.org/notes/imvec/07-02-2022/anadir-jack-al-coqui-para-grabar-mediciones..." | Read more » 3 months ago
Ag8n "The conductivity cell should take the place of Rx. So disconnect the conductivity cell, disconnect Rx, leave the one of the conductivity cell conn..." | Read more » 6 months ago
alejobonifacio "Thanks @Ag8n for the explanation! I am learning a lot! :nerd_face: " | Read more » 6 months ago
alejobonifacio "Hi @Ag8n! What you suggest sounds interesting. Would it be something similar to the attached diagram? " | Read more » 6 months ago
Ag8n "Further note-EC is electrical conductivity " | Read more » 6 months ago
Ag8n "Especially in mixtures, not all soluble solids are conductive. So yes, you can dissolve (or sometimes suspend) something inert in water. We would..." | Read more » 6 months ago
warren "This is very cool! I do wonder if TDS is going to be consistently correlated with conductivity -- i may just not be well informed but isn't it poss..." | Read more » 6 months ago
Ag8n "Look up conductivity cell and wheatstone bridge Instead of feeding DC into the weatstone bridge, the audio signal is fed in. One leg of the wheats..." | Read more » 6 months ago
alejobonifacio "Thanks for your suggestion @Ag8n, sounds very interesting to try. Anyway I have to be honest and say that I don't quite figure out how to do what y..." | Read more » 6 months ago
Ag8n "It looks like the Coqui is a pretty well designed instrument. But, some of the pharmaceutical instruments would send the tone through a bridge. T..." | Read more » 6 months ago
alejobonifacio "Hi @warren! Yes, 0.1-1 g/L is a useful range at least in rivers in this part of the world, in fact for this river test it worked well. I still have..." | Read more » 6 months ago
liz "Thank you for this close and careful work <3 " | Read more » 6 months ago
warren "Hi @alejobonifacio i wonder if there is an 'ideal' range if we can use resistors or capacitor sizes to shift that to our looked-for "search range" ..." | Read more » 6 months ago