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Įraše apie ultravioletą sukritikavau savo lipdinį. Paeksperimentavus su švitinimo laiku, nuotoliu tarp plokštės ir diodų bei pačiais chemikalais, gaunasi visai neblogi rezultatai.

Deja tolygios gaunasi tik nedidelio ploto plokštės. Kryptiškai šviečiantys diodai vienodai visos plokštės neapšvitina - vidurys kepa daugiau nei turėtų, o pakraščiai, pakankamai negavę UV spindulių, lieka per daug pasidengę variu. Štai pavyzdys kaip tai atrodo:

Atrodytų brokas menkas, bet visgi jis yra…

PCB kokybei įtakos turi ir tirpalas, kuriame jos ėsdinamos. Visada naudodavau geležies chloridą (FeCl3) tačiau pasiskaitęs teigiamų atsiliepimų apie natrio persulfatą nutariau išbandyti ir šį chemikalą. Daugiau apie šių chemikalų pliusus ir minusus, netgi su reakcijų lygtimis, galite pasiskaityti čia. Natrio persulfate mirkytos plokštės gaunasi dailesnės, nei laikytos geležies chloride. FeCl3 palenda po takeliais ir iškandžioja jų kraštus, be to tai yra toks tepantis tirpalas, kad po plokštės ėsdinimo dar pora dienų tenka vaikščioti su pageltusiais pirštų galais :)

Štai taip atrodo  FeCl3 mirkoma plokštė:


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Komentarai įrašui “Darbo rezultatai (PCB)”
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