#garfield Logs

Jan 24 2022

01:10 AM rue_bed: 10pm: brain: "I'm awake now... lets play!"
01:18 AM rue_bed: ugh
01:18 AM rue_bed: https://ae01.alicdn.com/kf/H2251e2889a9643d08fef0ca4faeacdb5z.jpg
01:18 AM rue_bed: so, thats probably not balanced optical glass
01:18 AM rue_bed: https://www.aliexpress.com/item/32714493263.html
01:18 AM rue_bed: colour lasers are avilable at a not-unreasonable price
01:18 AM rue_bed: https://ae01.alicdn.com/kf/Hc111de92a4da425b9696fe593e87f7d3x.jpg
01:18 AM rue_bed: proper beam splitter
01:18 AM rue_bed: https://www.aliexpress.com/item/4000159018989.html
01:18 AM rue_bed: or proper 50/50 glass
01:18 AM rue_bed: https://www.aliexpress.com/item/4000143496146.html
01:18 AM rue_bed: but for 'toy grade' they do go cheap
04:54 AM Tom_L: morning
05:44 AM polprog: the magic search term for proper lenses and glass is BK7
08:40 AM rue_bed: but does that all lead to high prices
05:25 PM Tom_L: evening
08:19 PM rue_mohr: Tom_L, hey log back
08:19 PM rue_mohr: you disappeared for a while
08:23 PM Tom_L: i did?
08:33 PM rue_mohr: yea, I said all sorts of things to ya over the last 3 days
08:33 PM rue_mohr: thought you went on a walkabout again
08:46 PM Tom_L: no not yet
08:46 PM Tom_L: not much goin on here
08:47 PM rue_mohr: lost my microscope slide covers
08:47 PM rue_mohr: I think their in a drawer somewhere
08:48 PM rue_mohr: with pen laser accessories
09:12 PM skunkworks: rue_mohr: still awake?
09:12 PM rue_bed: for a minute
09:13 PM rue_bed: its too bad nobody ever saw the stuff I did about not using sinuoidal exciters on resolvers
09:13 PM Tom_L: when?
09:13 PM rue_bed: its MUCH more easy to use triangle waves
09:14 PM rue_bed: I was going on and on and on about it about a year ago
09:14 PM rue_bed: but sometimes I just get written off as a babbeling madman
09:14 PM skunkworks: lol
09:14 PM Tom_L: only by your other self :)
09:14 PM rue_bed: I was going to make and sell resovlers, cause they are so stupid expensive
09:14 PM skunkworks: I am getting noise for a few minutes after turning on the op amps
09:14 PM skunkworks: I may have cut some corners..
09:15 PM rue_bed: I took the price of the circuit for a resolver down to about $5,
09:15 PM rue_bed: but then realized that I could use linear variable differential capacitors cheaper
09:15 PM rue_bed: I think I got them under $1
09:16 PM rue_bed: then I got distracted
09:16 PM Tom_L: not that uncommon either
09:16 PM skunkworks: https://photos.app.goo.gl/SSFRLnPSZGebscbC7
09:16 PM rue_bed: but the cost of the lvdt systems is JUST STUPID
09:17 PM rue_bed: what op-amps did you use again?
09:17 PM skunkworks: https://www.mouser.com/datasheet/2/308/1/L272A_D-2314790.pdf
09:17 PM rue_bed: dont know of them
09:18 PM skunkworks: like a 1 amp op-amp... thought it would work good for this situation
09:18 PM rue_bed: the headroom is someting to watch out for
09:18 PM skunkworks: https://photos.google.com/photo/AF1QipOZDxj4vP65kVAZ2HJkWguSrY3o1GR2SeTcJQs
09:18 PM skunkworks: it goes away after a few minutes
09:18 PM rue_bed: like a lm741 cant really get to within like, 4V of its power rails
09:19 PM Tom_L: last one requires a sign in
09:19 PM skunkworks: The top signal is right from the arduino..
09:19 PM skunkworks: oh - sorry
09:19 PM skunkworks: https://photos.app.goo.gl/4xEP3XBNY1axFcAaA
09:19 PM Tom_L: something pooped on your screen!
09:20 PM skunkworks: Right!?