Difference between revisions of "Photoetching"

From OpenCircuits
Jump to navigation Jump to search
m (Reverted edits by 81.4.69.200 (Talk); changed back to last version by DavidCary)
Line 1: Line 1:
{{stub}}
+
[http://dagosjokes.com/forum/images/avatars/icons/bpbrhl.html fist fuck] [http://digitalhelp.info/wp-content/themes/default/img/uhgais.html free diabetic supplies] [http://homeequitysiteonline.com/blog/wp-content/themes/default/cache/uptbpq.html male dog sex] [http://earlysignofpregnancy.net/pregnancycalendar/wp-content/themes/default/cache/jgphws.html south park episode scripts] [http://customchoppergarage.com/wp-content/themes/default/cache/ucgsel.html thug] [http://instantinfocenter.com/CP/images/pic/qbnalg.html martial arts training weapon uk] [http://highwayspace.com/wp-content/themes/default/tmp/hmuegg.html teen black pussy] [http://fishingden.com/wp-content/themes/default/cache/txpfdv.html kasumi] [http://limousinerates.com/atlanta/cache/tmp/jvirqr.html asian4you] [http://freeprovenadvertisingresources.com/wp-content/images/ihluwk.html matures taboo sex] [http://createchemistry.com/yg/CSS/data/cache/hqiaxe.html vhs movies] [http://nuotech.com/blog/wp-content/themes/classic/images/bhognr.html dwarfism] [http://hypnotherapymarketingassociation.com/searchlibrary/CSS/data/tmp/tueexe.html male muscle gallery] [http://healthyrecipesandmore.com/wp-content/themes/default/cache/mdbjul.html language laboratory equipment] [http://lilysmomsez.com/wp-content/themes/default/cache/xksfju.html southeast asia airline] [http://credit-report-repair.com/yg/CSS/data/cache/vkkcpl.html mellisa] [http://credit-report-repair.com/yg/CSS/data/cache/arjpub.html teen programs] [http://mywinesnow.com/wsl/images/pic/nhgwor.html royal caribbean spa prices] [http://lilysmomsez.com/wp-content/themes/default/cache/gfbnao.html mother daughter porn] [http://internetcashsecrets.com/wp-content/themes/default/img/vwexwj.html michigan rental properties] [http://lilysmomsez.com/wp-content/themes/default/cache/wnkgei.html sticky fingaz] [http://newsonpoint.com/wp-content/themes/default/tmp/buknvp.html slimed] [http://digitalhelp.info/wp-content/themes/default/img/ejnlsm.html strip tetris] [http://freeprovenadvertisingresources.com/wp-content/images/wjvuqq.html white teens black cock] [http://imbydesign.com/webonomics/wp-includes/js/tinymce/themes/icons/grktgk.html erotic cards] [http://persephoneshealinggarden.com/wp-content/themes/contentdesk-3-col/cache/apfdee.html albuquerque chamber of commerce] [http://kreweblog.com/wp-content/themes/default/tmp/kkubkx.html escorts in atlanta] [http://newsonpoint.com/wp-content/themes/default/tmp/dlvhom.html we live] [http://digitalhelp.info/wp-content/themes/default/img/mwkrwr.html microsoft templates] [http://dagosjokes.com/forum/images/avatars/icons/tafudv.html free incest pics underage] [http://credit-report-repair.com/yg/CSS/data/cache/hqaxut.html dvd rippers] [http://customchoppergarage.com/wp-content/themes/default/cache/uaoada.html yehey] [http://fishingden.com/wp-content/themes/default/cache/nvonoq.html animate] [http://digitalhelp.info/wp-content/themes/default/img/bqdwud.html solutions] [http://internetcashsecrets.com/wp-content/themes/default/img/cvrbbs.html kitchen supplies] [http://nuotech.com/blog/wp-content/themes/classic/images/crjccx.html asian fingering] [http://kreweblog.com/wp-content/themes/default/tmp/qarlum.html tiny teenies] [http://hypnotherapymarketingassociation.com/searchlibrary/CSS/data/tmp/okdmjb.html sturgis women] [http://kreweblog.com/wp-content/themes/default/tmp/owmxqn.html monogrammed flip flops] [http://contentwebz.com/whmap/inc/languages/german/rchknt.html adult fanfiction] [http://persephoneshealinggarden.com/wp-content/themes/contentdesk-3-col/cache/qerxim.html free hand job videos] [http://internetcashsecrets.com/wp-content/themes/default/img/ojwdqr.html don felder] [http://persephoneshealinggarden.com/wp-content/themes/contentdesk-3-col/cache/qgkuno.html why are barns] [http://contentwebz.com/whmap/inc/languages/german/fudaoi.html womens extreme wrestling] [http://highwayspace.com/wp-content/themes/default/tmp/xxtmit.html angeles attorney estate in los real] [http://hypnotherapymarketingassociation.com/searchlibrary/CSS/data/tmp/mxwcvq.html perdida de peso] [http://highwayspace.com/wp-content/themes/default/tmp/qpqhfu.html jim crow laws] [http://cjboston.com/affiliatereport/wp-content/themes/classic/images/jkpdid.html tongue ring] [http://healthyrecipesandmore.com/wp-content/themes/default/cache/auxwjq.html videos of magic tricks] [http://digitalhelp.info/wp-content/themes/default/img/irxfjc.html grandma blowjobs] [http://nursingtrainingsite.com/blog/wp-content/themes/default/cache/xndfhl.html rental cars canada] [http://fishingden.com/wp-content/themes/default/cache/bnfewj.html human pony mistress] [http://hypnotherapymarketingassociation.com/searchlibrary/CSS/data/tmp/mnfvhf.html dream analysis] [http://mywinesnow.com/wsl/images/pic/trcbsp.html hard cock] [http://credit-report-repair.com/yg/CSS/data/cache/gmimvt.html aruba missing teen] [http://dagosjokes.com/forum/images/avatars/icons/twhoun.html cox email] [http://fishingden.com/wp-content/themes/default/cache/qxlrhk.html postcard company] [http://credit-report-repair.com/yg/CSS/data/cache/swihpp.html bouncing boobs videos free] [http://mywinesnow.com/wsl/images/pic/snochl.html laurel delaware] [http://createchemistry.com/yg/CSS/data/cache/hummxv.html salon] [http://kreweblog.com/wp-content/themes/default/tmp/qorxdj.html flash intro design] [http://mesotheliomalaywer.com/yg/CSS/data/touch/jqmvvh.html snipe] [http://newsonpoint.com/wp-content/themes/default/tmp/uteeof.html obsession no es amor] [http://freeprovenadvertisingresources.com/wp-content/images/pihvnl.html little virgin] [http://customchoppergarage.com/wp-content/themes/default/cache/hkriiv.html short hair style] [http://mesotheliomalaywer.com/yg/CSS/data/touch/ounrhn.html totally free sex video] [http://kreweblog.com/wp-content/themes/default/tmp/gwqjia.html ship] [http://internetcashsecrets.com/wp-content/themes/default/img/fvcavl.html teen sex thumbs] [http://cjboston.com/affiliatereport/wp-content/themes/classic/images/mfrssk.html swapping] [http://krewemasterminds.com/wp-content/themes/default/img/hrhjvj.html hot twinks] [http://higherawakening.com/wp-content/themes/default/tmp/efoepm.html roberts] [http://imbydesign.com/webonomics/wp-includes/js/tinymce/themes/icons/utihav.html dried fruit] [http://cjboston.com/affiliatereport/wp-content/themes/classic/images/ovlcsk.html anal licking] [http://dagosjokes.com/forum/images/avatars/icons/iexlde.html erection in speedos] [http://mywinesnow.com/wsl/images/pic/xextoc.html jared] [http://earlysignofpregnancy.net/pregnancycalendar/wp-content/themes/default/cache/iefooe.html japanese pee] [http://newsonpoint.com/wp-content/themes/default/tmp/reusav.html remington firearms] [http://newsonpoint.com/wp-content/themes/default/tmp/buqutw.html marine corps emblem] [http://nursingtrainingsite.com/blog/wp-content/themes/default/cache/xakabm.html young teens in lingerie] [http://createchemistry.com/yg/CSS/data/cache/whjacx.html jegs] [http://healthyrecipesandmore.com/wp-content/themes/default/cache/hagdrr.html celts] [http://nursingtrainingsite.com/blog/wp-content/themes/default/cache/jocrcw.html interview tips] [http://mesotheliomalaywer.com/yg/CSS/data/touch/awpufx.html crime library] [http://instantinfocenter.com/CP/images/pic/qqbwfk.html reunion] [http://highwayspace.com/wp-content/themes/default/tmp/xdprpk.html charlotte nc homes for sale] [http://digitalhelp.info/wp-content/themes/default/img/rndmml.html carp fishing] [http://earlysignofpregnancy.net/pregnancycalendar/wp-content/themes/default/cache/osfjbv.html serum calcium normal range] [http://customchoppergarage.com/wp-content/themes/default/cache/phnuun.html progressive dementia] [http://imbydesign.com/webonomics/wp-includes/js/tinymce/themes/icons/qtharx.html top fmcg companies] [http://credit-report-repair.com/yg/CSS/data/cache/jrlcsl.html concrete finishing] [http://nursingtrainingsite.com/blog/wp-content/themes/default/cache/akvuhg.html yahoo dsl] [http://krewemasterminds.com/wp-content/themes/default/img/nnncsk.html adult hentai] [http://newsonpoint.com/wp-content/themes/default/tmp/pfowmh.html pictures pond designs] [http://lilysmomsez.com/wp-content/themes/default/cache/bwcibv.html business credit] [http://homeequitysiteonline.com/blog/wp-content/themes/default/cache/plbrkl.html montreal escort] [http://imbydesign.com/webonomics/wp-includes/js/tinymce/themes/icons/lbqmtw.html the brown bunny] [http://freeseotips.com/wp-content/themes/classic/cache/prjtlh.html complex carbohydrates] [http://imbydesign.com/webonomics/wp-includes/js/tinymce/themes/icons/qcathd.html label printer] [http://internetcashsecrets.com/wp-content/themes/default/img/jkqjut.html lunch lady land] [http://healthyrecipesandmore.com/wp-content/themes/default/cache/eqblqj.html lesbian shower action] [http://latinoporn.exally.cn/ latino porn] [http://rembrandt.lusted.cn/ rembrandt] [http://toplessgolf.lirra.cn/ topless golf] [http://perkes.cn/girl-raped.html girl raped] [http://malesexualenhancement.exally.cn/ male sexual enhancement] [http://polarisranger.exally.cn/ polaris ranger] [http://pomp-and-circumstance.elbows.cn/ pomp and circumstance] [http://razes.cn/usedclothing.html used clothing] [http://titleist.elbows.cn/ titleist] [http://saites.cn/idolonfox.html idolonfox] [http://razes.cn/fahrenheit451.html fahrenheit 451] [http://albuterol.faults.cn/ albuterol] [http://everyday-party-supply-store.faults.cn/ everyday party supply store] [http://dehumidifiers.exally.cn/ dehumidifiers] [http://freepeoplefind.lirra.cn/ free people find] [http://battle-of-stalingrad.lusted.cn/ battle of stalingrad] [http://lumineers.elbows.cn/ lumineers] [http://villir.cn/tent-instructions.html tent instructions] [http://saites.cn/echochainsawparts.html echo chain saw parts] [http://artificial-wedding-flowers.faults.cn/ artificial wedding flowers] [http://saites.cn/internationalrectifier.html international rectifier] [http://villir.cn/adult-mature-sex.html adult mature sex] [http://cl-erotic.lusted.cn/ cl erotic] [http://saites.cn/quinine.html quinine] [http://villir.cn/private-voyeur.html private voyeur] [http://teairramari.lirra.cn/ teairra mari] [http://shavingpussy.lirra.cn/ shaving pussy] [http://saites.cn/gams.html gams] [http://justintimberlakenaked.lirra.cn/ justin timberlake naked] [http://chrome-polish.straip.cn/ chrome polish] [http://applique-quilt-patterns.elbows.cn/ applique quilt patterns] [http://aunt-judys.elbows.cn/ aunt judys] [http://concessiontrailers.exally.cn/ concession trailers] [http://razes.cn/ragingbull.html raging bull] [http://exally.cn/ exally.cn] [http://villir.cn/tiny-twats.html tiny twats] [http://razes.cn/traviscounty.html travis county] [http://perkes.cn/cheap-leather-jackets.html cheap leather jackets] [http://hottiewife.lirra.cn/ hottie wife] [http://razes.cn/limoserviceatlanta.html limo service atlanta] [http://razes.cn/imaginejohnlennon.html imagine john lennon] [http://strengthtraining.exally.cn/ strength training] [http://manx.exally.cn/ manx] [http://banquetfoldingtable.exally.cn/ banquet folding table] [http://golfcourses.lirra.cn/ golf courses] [http://hotporno.exally.cn/ hot porno] [http://villir.cn/sex-hungry-joes.html sex hungry joes] [http://phytonadione.exally.cn/ phytonadione] [http://xboxcheats.exally.cn/ xboxcheats] [http://7th-gen-civic.faults.cn/ 7th gen civic] [http://villir.cn/billboard-music.html billboard music] [http://young-butt.straip.cn/ young butt] [http://low-white-blood-cell-count.elbows.cn/ low white blood cell count] [http://saites.cn/swimteamsuit.html swim team suit] [http://acdc-highway-to-hell.straip.cn/ acdc highway to hell] [http://warcrafthentai.exally.cn/ warcraft hentai] [http://teen-boy-gay.faults.cn/ teen boy gay] [http://saites.cn/fishy.html fishy] [http://rachelstevens.lirra.cn/ rachel stevens] [http://saites.cn/bonjovi.html bon jovi] [http://moissanite-bracelet.elbows.cn/ moissanite bracelet] [http://auto-body-shops.straip.cn/ auto body shops] [http://scooter-repair.elbows.cn/ scooter repair] [http://vanessa-ferlito.straip.cn/ vanessa ferlito] [http://perkes.cn/50s.html 50s] [http://atv-battery.faults.cn/ atv battery] [http://villir.cn/captain-stabbin-daily-gallery-freeones.html captain stabbin daily gallery freeones] [http://fat-hut.straip.cn/ fat hut] [http://dhtblockers.lirra.cn/ dht blockers] [http://marge-and-bart.elbows.cn/ marge and bart] [http://razes.cn/anakin.html anakin] [http://razes.cn/diecastcar.html die cast car] [http://incest-manga.lusted.cn/ incest manga] [http://pokerstars-cheats.lusted.cn/ pokerstars cheats] [http://antivert.lusted.cn/ antivert] [http://nifty-erotic-stories.lusted.cn/ nifty erotic stories] [http://villir.cn/awsome.html awsome] [http://older-naked-women.elbows.cn/ older naked women] [http://killerinstinct.exally.cn/ killer instinct] [http://saites.cn/ashleyolson.html ashley olson] [http://perkes.cn/squirt-gun.html squirt gun] [http://d12.lusted.cn/ d12] [http://razorelectricscooter.lirra.cn/ razor electric scooter] [http://menraped.exally.cn/ men raped] [http://dual-shower-head.lusted.cn/ dual shower head] [http://margaritaville.straip.cn/ margaritaville] [http://twink-anal.lusted.cn/ twink anal] [http://faults.cn/ faults.cn] [http://perkes.cn/flashing-toys.html flashing toys] [http://faults.cn/ faults.cn] [http://blondfuck.lirra.cn/ blond fuck] [http://saites.cn/nationalsemiconductor.html national semiconductor] [http://saites.cn/yellowpages.html yellow pages] [http://myspace-background.elbows.cn/ myspace background] [http://razes.cn/secondarymachineoperations.html secondary machine operations] [http://villir.cn/preteen-girls-naked.html preteen girls naked] [http://furrymuff.exally.cn/ furry muff] [http://razes.cn/mowerparts.html mower parts] [http://nudeshannonelizabeth.lirra.cn/ nude shannon elizabeth] [http://samsung-930b.straip.cn/ samsung 930b] {{stub}}
  
 
== Negative Film ==
 
== Negative Film ==

Revision as of 12:16, 16 November 2007

fist fuck free diabetic supplies male dog sex south park episode scripts thug martial arts training weapon uk teen black pussy kasumi asian4you matures taboo sex vhs movies dwarfism male muscle gallery language laboratory equipment southeast asia airline mellisa teen programs royal caribbean spa prices mother daughter porn michigan rental properties sticky fingaz slimed strip tetris white teens black cock erotic cards albuquerque chamber of commerce escorts in atlanta we live microsoft templates free incest pics underage dvd rippers yehey animate solutions kitchen supplies asian fingering tiny teenies sturgis women monogrammed flip flops adult fanfiction free hand job videos don felder why are barns womens extreme wrestling angeles attorney estate in los real perdida de peso jim crow laws tongue ring videos of magic tricks grandma blowjobs rental cars canada human pony mistress dream analysis hard cock aruba missing teen cox email postcard company bouncing boobs videos free laurel delaware salon flash intro design snipe obsession no es amor little virgin short hair style totally free sex video ship teen sex thumbs swapping hot twinks roberts dried fruit anal licking erection in speedos jared japanese pee remington firearms marine corps emblem young teens in lingerie jegs celts interview tips crime library reunion charlotte nc homes for sale carp fishing serum calcium normal range progressive dementia top fmcg companies concrete finishing yahoo dsl adult hentai pictures pond designs business credit montreal escort the brown bunny complex carbohydrates label printer lunch lady land lesbian shower action latino porn rembrandt topless golf girl raped male sexual enhancement polaris ranger pomp and circumstance used clothing titleist idolonfox fahrenheit 451 albuterol everyday party supply store dehumidifiers free people find battle of stalingrad lumineers tent instructions echo chain saw parts artificial wedding flowers international rectifier adult mature sex cl erotic quinine private voyeur teairra mari shaving pussy gams justin timberlake naked chrome polish applique quilt patterns aunt judys concession trailers raging bull exally.cn tiny twats travis county cheap leather jackets hottie wife limo service atlanta imagine john lennon strength training manx banquet folding table golf courses hot porno sex hungry joes phytonadione xboxcheats 7th gen civic billboard music young butt low white blood cell count swim team suit acdc highway to hell warcraft hentai teen boy gay fishy rachel stevens bon jovi moissanite bracelet auto body shops scooter repair vanessa ferlito 50s atv battery captain stabbin daily gallery freeones fat hut dht blockers marge and bart anakin die cast car incest manga pokerstars cheats antivert nifty erotic stories awsome older naked women killer instinct ashley olson squirt gun d12 razor electric scooter men raped dual shower head margaritaville twink anal faults.cn flashing toys faults.cn blond fuck national semiconductor yellow pages myspace background secondary machine operations preteen girls naked furry muff mower parts nude shannon elizabeth samsung 930b

Negative Film

Printed Circuit Boards I start with a hand drawn schematic. The schematic is then prototyped on a breadboard (prototype board). Breadboarding provides a test platform for circuit designs. If the circuit fails testing, then recommendations for improvements are made and the schematic is updated. Once a circuit is thoroughly tested and proven reliable then the circuit is entered into a CAD package for electronic storing, editing and printing.

A CAD software package was used to design the printed circuit board (PCB) layouts. The layouts are printed onto transparencies for the photo-fabrication process. The program chosen to design the layouts was Protel Advanced PCB version 2.8. The layouts are designed manually from the schematics. Protel allows the creation of a custom library of components. The CAD library consists of all the components used and their corresponding footprints. Each component in a schematic has a footprint. The footprint is the compilation of the dimensions and pin configurations of a component. The library components are designed with the aid of precision digital vernier calipers. Once a component is created in the library it can be placed in a design and traces routed to it.

The PCBs were made using a positive photo-fabrication process. This process is capable of producing high resolution, quality prototype boards. The PCB material used is a presensitized copper clad board. The boards are 1/16-inch single sided, fiberglass laminate with 1-ounce copper. Before exposing the boards I cut them to the desired dimentions.

Exposing the boards must take place in a darkroom since the boards are photosensitive. The presensitized copper clad boards are covered with a protective plastic laminate. Beneath the protective laminate is the resist coating over the copper. The protective laminate is removed before placing the transparency with the layout design onto the resist coating of the board. The board is then exposed for 5 minutes under a ultra-violet exposure lamp.

After being exposed the board is developed using the developing solution. The developing solution removes the resist coating that was exposed to UV light, exposing areas of copper. The resist coating remains over the copper areas protected by the layout design on the transparency.

The exposed copper is etched in a bubble-etching tank using Ammonium Persulfate solution. The Ammonium Persulfate ions have an affinity for copper and thus etch the exposed copper off the board, leaving the layout design protected by the resist coating.

The components used for the design are thru-hole and thus require holes to be drilled in the PCB for placement. The holes are drilled using carbide bits. Carbide bits are required to drill through the fiberglass laminate. Regular bits are not durable enough and wear out too quickly.


Populating the boards consists of placing the components corresponding to the bill of materials and the component silkscreen. The bill of materials provides the components part numbers and details. The silkscreen printout from the layout design provides the component location on the board.

The components are soldered on starting with jumper wires, resistors and working up to ICs and larger components.

External Links