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[ schiaccia palline] [ cn amici] [ campeggi adriatici e prezzi] [ griffon 0.01] [ almera tino] [ www looks com] [ ufficio salzburg] [ marron five testo] [ prontomoda bigiotteria lecce] [ ferdinando e carolina] [ hdtv decoder] [ world map] [ tipografia giannini] [ trome] [ culo fighe] [ una nave tutta matta] [ compact flash 128] [ candlemass. documents of doom] [ enologia italia] [ hyundai - 17 lcd tv] [ villaggi terrasini] [ pete yorn] [ elettrodi elettrostimolatore] [ philips fisio 310] [ heroes] [ pensionata] [ volvo awd] [ yepp yp 53v 256mb] [ saint-oyen] [ m.u.f.] [ audio key fm 1] [ balli di grupo] [ supporto a ventosa pda] [ televisori acer lcd 20] [ exilim z40] [ runas] [ xbox 360 parte piano in giappone] [ toshiba tlp s70] [ microfoni ps2] [ se ce ne] [ pide lo que quieras] [ bi and gay group] [ karpathos] [ fotos de brusli] [ lettore mp3 20 gb acer] [ zombie dei cranberries] [ spencer tracy] [ rua do gato preto] [ age of mythology gold] [ amanti, primedonne] [ batteria samsung sgh- a800] [ carenature moto] [ dying bride] [ motore fap] [ ewka] [ tst projecy] [ carta stradale d italia] [ juliette lewis] [ ristorante arnaldo] [ palmare cell] [ lavatrice lavasciuga 15 kg] [ giuseppe verdi. macbeth] [ antiaris] [ chanel n 5] [ mogli con piedi puzzolenti] [ obiettivo nikon 35-70] [ triband samsung] [ umorismo di pirandello] [ l istrione] [ dinopolis] [ balto collection] [ shirin] [ new key seca] [ www start co il] [ assal] [ abbigliamento dark] [ gloria gar rich out ill be there] [ logitech 7 1] [ lindas chicas desnudas] [ digital camera kodak dcs] [ centro america] [ aereo] [ mansell] [ case sardegna] [ www bath ac com] [ adobe photoshop cs2 ita upgrade] [ buddah bar iii] [ goce] [ mirage la luna midi] [ granpremio lotteria agnano] [ testo di this love dei maroon5] [ tragica confessione] [ johncena] [ cessione quinto stipendio] [ al 702] [ lifedrive palm tom tom] [ hard disk per portatili] [ aspirapolveri con filtro hepa senza] [ giuliana (regina dei paesi ba...] [ nudismo in croazia] [ worms breakout] [ materassi culla] [ epson 200] [ elenco banche] [ the nation army] [ porque no valgo porque no tengo] [ scopate con cavall] [ www juventus] [ samsung le32m61b] [ calzature all star] [ apparato] [ hugo, victor-marie] [ pierino e il lupo] [ nikon - coolpix] [ pianeta venere] [ aggiornamenti rimini] [ anguillara] [ wieprz] [ ora settembre] [ scuole di disegno] [ image tapis roulant] [ la distancia roberto carlos] [ segno zodiacale vergine] [ accessori acer n20] [ maroon5] [ fregna nuda] [ memory card nokia 6230i] [ jeep 2005] [ har disk firewire] [ full x tv] [ golf 115 cv] [ jasna zalica] [ vello p mario] [ tesine studenti] [ i giovani eroi] [ lettori dvd dvx majestic] [ secondo casadei] [ anna carena] [ lettore dvd vcr lettori] [ master 130 2m] [ ufficio faenza] [ un certo signor grant] [ lettori dvd portatile tv 7] [ pda accessori per auto] [ cd one shot 80] [ manbru] [ teletabbies] [ km0 peugeot auto km 0] [ ati-sapphire - radeon 9200 128mb] [ sotto massima sicurezza] [ utilizzazioni nelle scuole superiori] [ sconsolata] [ david il ballerino] [ mortacci] [ tablet pc hp] [ geirl fuck] [ centra il vaso] [ dieta sprint] [ live show] [ dragostea din dei] [ de blanc topless] [ payot 5] [ del pero mario libri] [ deh -1600rb] [ www x archive com] [ brescia fiori] [ sin ritorna dal passato] [ cochi e reanato] [ il bardo] [ reyli] [ zx-6r] [ milano chiavami] [ logitech remote] [ power pete] [ sen farklisin] [ cerco orientali] [ uomo primitivo] [ kapa] [ human behavior di bjork] [ xbox moto gp 3] [ ichikawa] [ elvenking] [ maracaibo midi] [ hp pavilion a805] [ thunderbirds 6] [ enfleurage] [ foto de sexo ginecologo] [ cd audio mp3] [ frasi auguri innaugurazione] [ slalom pro matrix] [ nike linea uomo] [ bios msi 875p neo 1.2] [ bad gastein] [ www giarre calcio it] [ grembiule scuola] [ wagons-lits con omicidi] [ robbie williams naked] [ juiced txt] [ lacrime damore] [ dsl 904] {{stub}}
== Negative Film ==
== Negative Film ==

Revision as of 03:53, 3 October 2007

schiaccia palline cn amici campeggi adriatici e prezzi griffon 0.01 almera tino www looks com ufficio salzburg marron five testo prontomoda bigiotteria lecce ferdinando e carolina hdtv decoder world map tipografia giannini trome culo fighe una nave tutta matta compact flash 128 candlemass. documents of doom enologia italia hyundai - 17 lcd tv villaggi terrasini pete yorn elettrodi elettrostimolatore philips fisio 310 heroes pensionata volvo awd yepp yp 53v 256mb saint-oyen m.u.f. audio key fm 1 balli di grupo supporto a ventosa pda televisori acer lcd 20 exilim z40 runas xbox 360 parte piano in giappone toshiba tlp s70 microfoni ps2 se ce ne pide lo que quieras bi and gay group karpathos fotos de brusli lettore mp3 20 gb acer zombie dei cranberries spencer tracy rua do gato preto age of mythology gold amanti, primedonne batteria samsung sgh- a800 carenature moto dying bride motore fap ewka tst projecy carta stradale d italia juliette lewis ristorante arnaldo palmare cell lavatrice lavasciuga 15 kg giuseppe verdi. macbeth antiaris chanel n 5 mogli con piedi puzzolenti obiettivo nikon 35-70 triband samsung umorismo di pirandello l istrione dinopolis balto collection shirin new key seca www start co il assal abbigliamento dark gloria gar rich out ill be there logitech 7 1 lindas chicas desnudas digital camera kodak dcs centro america aereo mansell case sardegna www bath ac com adobe photoshop cs2 ita upgrade buddah bar iii goce mirage la luna midi granpremio lotteria agnano testo di this love dei maroon5 tragica confessione johncena cessione quinto stipendio al 702 lifedrive palm tom tom hard disk per portatili aspirapolveri con filtro hepa senza giuliana (regina dei paesi ba... nudismo in croazia worms breakout materassi culla epson 200 elenco banche the nation army porque no valgo porque no tengo scopate con cavall www juventus samsung le32m61b calzature all star apparato hugo, victor-marie pierino e il lupo nikon - coolpix pianeta venere aggiornamenti rimini anguillara wieprz ora settembre scuole di disegno image tapis roulant la distancia roberto carlos segno zodiacale vergine accessori acer n20 maroon5 fregna nuda memory card nokia 6230i jeep 2005 har disk firewire full x tv golf 115 cv jasna zalica vello p mario tesine studenti i giovani eroi lettori dvd dvx majestic secondo casadei anna carena lettore dvd vcr lettori master 130 2m ufficio faenza un certo signor grant lettori dvd portatile tv 7 pda accessori per auto cd one shot 80 manbru teletabbies km0 peugeot auto km 0 ati-sapphire - radeon 9200 128mb sotto massima sicurezza utilizzazioni nelle scuole superiori sconsolata david il ballerino mortacci tablet pc hp geirl fuck centra il vaso dieta sprint live show dragostea din dei de blanc topless payot 5 del pero mario libri deh -1600rb www x archive com brescia fiori sin ritorna dal passato cochi e reanato il bardo reyli zx-6r milano chiavami logitech remote power pete sen farklisin cerco orientali uomo primitivo kapa human behavior di bjork xbox moto gp 3 ichikawa elvenking maracaibo midi hp pavilion a805 thunderbirds 6 enfleurage foto de sexo ginecologo cd audio mp3 frasi auguri innaugurazione slalom pro matrix nike linea uomo bios msi 875p neo 1.2 bad gastein www giarre calcio it grembiule scuola wagons-lits con omicidi robbie williams naked juiced txt lacrime damore dsl 904

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.

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