#garfield Logs

Nov 23 2021

07:16 PM rue_mohr: hearing helpers for ma
07:24 PM rue_mohr: I'm trying to cut back on "what"s by 50%
08:11 PM Tom_L: heh
09:28 PM rue_mohr: https://worldradiohistory.com/UK/Practical-Electronics/60s/Practical-Electronics-1969-05.pdf
09:29 PM rue_mohr: polprog, bottom of pdf page 48
09:42 PM rue_mohr: https://worldradiohistory.com/UK/Practical-Electronics/60s/Practical-Electronics-1968-09.pdf
09:42 PM rue_mohr: pdf page 53
09:53 PM rue_mohr: PRINTED CIRCUITS Copper is still the most used electrical conductor, not only in the form of wire, but in increasing quantities on printed circuits, where the connections are made by etched foil on an insulating baseboard. The copper foil for the manufacture of the dad laminates is made by electro-plating polished stainless steel strip and parting the two metals mechanically, which is not difficult because the electro-deposit has only
09:53 PM rue_mohr: poor adhesion to the polished surface. This method produces foil that is polished on one side and dull on the other
09:53 PM rue_mohr: ^^!!
09:54 PM rue_mohr: Martensitic stainless steel can be hardened, is mag- netic and though much more resistant to corrosion than ordinary hard steel is not as resistant to stain- ing as the austenitic type. Table knives are made of martensitic stainless steel