| azonenberg_work | so i'm running through the comb drive process now | 17:45 |
|---|---|---|
| azonenberg_work | just did top side hardmaskk evaporation, waiting for vacuum so i can do bottom | 17:45 |
| azonenberg_work | things are looking good so far | 17:46 |
| soul-d | k what step that be ? | 18:01 |
| soul-d | also maybe a note that first you talk front and back then change to use top bottom | 18:02 |
| azonenberg | soul-d: It pretty much depends on which way you are holding the wafer :p | 18:49 |
| azonenberg | I just did 3 and 5, 4 can be done before or after 5 so i havent done it yet | 18:50 |
| azonenberg | that just involves dipping the wafer in acetone | 18:50 |
| azonenberg | Which has to wait until i clean out my dirty classware ;p | 18:51 |
| azonenberg | glassware* | 18:51 |
| soul-d | wich tools are a must for this hobby btw like you made somthing out of a microscope optics? ( egg same idea als those old negative pictures used for enlarging ) | 19:06 |
| azonenberg | The first thing to do is get a working contact lithography process set up at 200um feature sizes on prnited circuit boards | 19:07 |
| azonenberg | If you use pre-coated PCB you can rule out variability in the photoresist as a source of problems | 19:07 |
| azonenberg | Once you have that working, try spin-coating blank board and make sure that works | 19:08 |
| azonenberg | then get a microscope and build a projection exposure rig, try doing exposures onto precoated PCB and then spin coated | 19:08 |
| azonenberg | At this point you can start thinking about more complex processes like the ones i'm doing | 19:08 |
| azonenberg | One big thing that has to be worked out is evaporation | 19:08 |
| azonenberg | Homebrewing an evaporator is possible | 19:09 |
| azonenberg | it's been done | 19:09 |
| azonenberg | but nobody has published clear plans and drawings that i know of | 19:09 |
| soul-d | yeah was looking for vacuum pumps other day but you gota watch out what kinds of results you get :P | 19:09 |
| soul-d | ill browse to my books | 19:11 |
| soul-d | well not today but got plenty of chemistry books need to read on theory of filament evaporation it was ? first sofar i could remmber was shematics for electric furnace | 19:20 |
| azonenberg | Hmm | 19:45 |
| azonenberg | Looks like the top hardmask didnt deposit right | 19:45 |
| azonenberg | I was a little worried about that tbh, i saw a nice even deposition on the bottom side but the top for some reason didnt work right | 19:46 |
| azonenberg | Not sure why but the top is getting etched | 19:46 |
| azonenberg | Good thing i have another wafer, i'll have to run the process again tomorrow | 19:46 |
| azonenberg | I'm gonna leave this one in KOH for an hour to see what happens | 19:47 |
| azonenberg | I expect it wont be usable though | 19:47 |
| azonenberg | Hmm, even the bottom side was weakened | 20:27 |
| azonenberg | something definitely went wrong | 20:28 |
| soul-d | those 2" expensive ? | 20:47 |
| azonenberg | $30 | 20:47 |
| azonenberg | Annoying but not the end of the world | 20:48 |
| azonenberg | But i want to figure out what went wrong before trying it again ;p | 20:48 |
| soul-d | sure | 20:48 |
| soul-d | only need to fix my uv light box with a decent timer and figure out if this laser printer works well last trials on clear sheets din't go to well | 20:50 |
| soul-d | for pcb | 20:50 |
| azonenberg | i see | 20:50 |
| azonenberg | Let me write up my lab notes for today, sec | 20:51 |
| CIA-67 | homecmos r151 | trunk/ (2 files in 2 dirs) | Today's lab notes | 20:57 |
| azonenberg | So basically what it looks like happened is that the Cr didnt deposit correctly | 20:59 |
| azonenberg | When i was depositing it, i saw a nice dark film on the bell jar near the top but very little at the bottom | 20:59 |
| azonenberg | I'm not sure what could cause a failure mode like that and need to do some reading / talk to some people | 20:59 |
| azonenberg | top of the jar that is, not the wafer | 21:01 |
| azonenberg | It looks like for some reason instead of the vapor spreading uniformly around the chamber, most of it went up | 21:02 |
| soul-d | on wiki it looked so simple | 21:09 |
| azonenberg | The deposition normally works fine | 21:09 |
| azonenberg | I probably did somethign stupid | 21:09 |
| azonenberg | all of my past evaporations have been successful | 21:09 |
| azonenberg | I think i got impatient and turned the temperature up too high | 21:09 |
| azonenberg | Because, as I found out earlier today | 21:15 |
| azonenberg | You don't evaporate chrome by melting it | 21:15 |
| azonenberg | it sublimes from the solid state | 21:15 |
| azonenberg | I kept turning it up higher because i expected it to melt | 21:15 |
| soul-d | tricky , reading your log forgot chat | 21:32 |
| azonenberg | lol | 21:33 |
| azonenberg | Anyway so i am going to try and do it again tomorrow | 21:34 |
| azonenberg | on my last unused wafer | 21:34 |
| azonenberg | after doing the contact mask tonight | 21:34 |
| soul-d | bought the final piece of equipment since i went in buying spree and stocked up on lots of smd stuff bought a solder station to go with it should help me get trough the winter should start on some prototypes soon also wanted to get one made sooner or later | 21:44 |
| soul-d | plenty of relativly cheap pcb makers online | 21:45 |
| azonenberg | very nice | 21:46 |
| soul-d | it hurts my wallet though | 21:47 |
| soul-d | but that's what hobby's are for i guess | 21:50 |
| azonenberg | Lol, yep | 21:52 |
| XgF | My friend dropped over £120 on cable connectors today... yikes... | 22:01 |
| azonenberg | o_O | 22:02 |
| soul-d | lol sounds like me almost but not that crazy | 22:02 |
| XgF | ...Neutrik are expensive | 22:02 |
| soul-d | did buy a lvds set for 13 eur :P | 22:02 |
| soul-d | wich i find expensive for connecting stuff | 22:03 |
| XgF | The danger of working in the entertainments industry: You start acquiring your own cables. You realise how expensive the damn things are | 22:03 |
| azonenberg | Lol | 22:04 |
| XgF | Impedance match cable gets expensive when you purchase it in non-negligible lengths in non-install forms | 22:05 |
| XgF | ....Especially when it has to be designed so that it won't break the first time some monkey rolls over it with an 130kg flightcase | 22:09 |
| Action: azonenberg wonders why most of that can't be run over ethernet / wifi as digital | 22:10 | |
| azonenberg | then going to analog right when it hits the speaker etc | 22:10 |
| XgF | This is impedance matched DMX (2 core twisted pair + shield) cable for lighting. Fixtures don't take ethernet directly (yet), namely because having dozens of ethernet switches causes latency issues | 22:11 |
| azonenberg | Dozens of switches? | 22:11 |
| azonenberg | What about a single 48 or 96 port | 22:11 |
| XgF | Thats fine until you need to get 16 ethernet cables onto a truss... | 22:12 |
| XgF | Or a switch, which causes its own logistical issues, and also ethernet is more expensive that DMX | 22:12 |
| XgF | Lots of venues will trunk multiple DMX universes over an ethernet cable from front of house to the stage and then break it out though | 22:14 |
| --- Tue Oct 25 2011 | 00:00 | |
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