| Author | Comment | Last activity | Moderation | ||
|---|---|---|---|---|---|
| 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 » | over 1 year 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 » | almost 2 years 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 » | about 2 years ago | |||
| alejobonifacio | "Thanks @Ag8n for the explanation! I am learning a lot! :nerd_face: " | Read more » | about 2 years ago | |||
| alejobonifacio | "Hi @Ag8n! What you suggest sounds interesting. Would it be something similar to the attached diagram? " | Read more » | about 2 years ago | |||
| Ag8n | "Further note-EC is electrical conductivity " | Read more » | about 2 years 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 » | about 2 years 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 » | about 2 years 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 » | about 2 years 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 » | about 2 years 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 » | about 2 years 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 » | about 2 years ago | |||
| liz | "Thank you for this close and careful work <3 " | Read more » | about 2 years 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 » | about 2 years ago | |||
| alejobonifacio | "Glad to hear that @bhamster! Comming soon the english version of the activity ;) Yes, there are some research papers that used this natural pigment..." | Read more » | over 2 years ago | |||
| bhamster | "This is so cool, @alejobonifacio, I had no idea about this cabbage capability! Do you know of any examples where this pH detection method has been ..." | Read more » | over 2 years ago |