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Author Topic: Using Double-sided Presensitized PCB (a technique)  (Read 3353 times)

Offline nucleus

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Re: Using Double-sided Presensitized PCB (a technique)
« Reply #20 on: March 06, 2010, 02:44:10 AM »
ako naman.. mas straight ang cut ko sa cutter kaya nagswitch na ako ;D ;D ;D

naiinis ako pag gumagamit ng cutter tapos biglang dudulas yung cut patagilid >:( ;D di pede sakin mabigat ang kamay ko =))
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Re: Using Double-sided Presensitized PCB (a technique)
« Reply #20 on: March 06, 2010, 02:44:10 AM »

Offline tiktak

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Re: Using Double-sided Presensitized PCB (a technique)
« Reply #21 on: March 06, 2010, 08:12:31 AM »
sir pano po ninyo nalink ang magkabilang side ng inyong pcb?
kung tama pagkakaintindi ko link between top and bottom layer ;D vias using kaynar wires(manipis na solid wire)
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Re: Using Double-sided Presensitized PCB (a technique)
« Reply #21 on: March 06, 2010, 08:12:31 AM »

Offline insomartin

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Re: Using Double-sided Presensitized PCB (a technique)
« Reply #22 on: March 06, 2010, 02:47:41 PM »
kung tama pagkakaintindi ko link between top and bottom layer ;D vias using kaynar wires(manipis na solid wire)
bumalik ulit ako sa conductive paint recently. wala nang time mag gupit at solder nang kaynar wires grrr.
for signal lines lang. common sense naman kung power rail / high current eh i conductive paint mo. trabaho na yan nang kaynar.  ;D

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Re: Using Double-sided Presensitized PCB (a technique)
« Reply #22 on: March 06, 2010, 02:47:41 PM »

Offline NanotecH

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Re: Using Double-sided Presensitized PCB (a technique)
« Reply #23 on: March 06, 2010, 03:46:24 PM »
^anong volume resistance ng conductive paint mo?

yung wire glue ko nasa range ng 90-150 ohms...graphite kasi ang gamit...
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Re: Using Double-sided Presensitized PCB (a technique)
« Reply #23 on: March 06, 2010, 03:46:24 PM »

Offline insomartin

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Re: Using Double-sided Presensitized PCB (a technique)
« Reply #24 on: March 06, 2010, 03:56:57 PM »
i forgot po. 1 - 1.5 ohm/sq/mm ata

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Re: Using Double-sided Presensitized PCB (a technique)
« Reply #24 on: March 06, 2010, 03:56:57 PM »

Offline Heuriskein

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Re: Using Double-sided Presensitized PCB (a technique)
« Reply #25 on: April 26, 2010, 12:52:57 PM »
ako naman.. mas straight ang cut ko sa cutter kaya nagswitch na ako ;D ;D ;D

I tried gumamit ng lagare but di effective, sa uri din cguro ng lagari na ginamit ko di masyadong fine ang ipin. Effective din sa akin tong matalas na cutter, but to avoid chipped edge sa kabilang side, ung dalawang side and pinapadaanan ko ng cutter, if sakto na and lalim (experience nalang), pwede ng baliin nalang by putting the board sa 90 degrees edged na table then apply pressure sa kabilang side, so far ganda ng output bastat pantay ang pagkaguhit ng magkabilaang side :D
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Offline mArKhAo

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Re: Using Double-sided Presensitized PCB (a technique)
« Reply #26 on: April 27, 2010, 08:24:58 PM »
^ mas maganda kung cutter nga, kasi, mas mganda ung result e, pag kasi lagari, kita ung mga hiwa-hiwa hehe, minsan tabingi pa ung direction ng line....  pero, kung mganda ka naman mag lagare, edi un gawin mo... ;D
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Offline franzschluter

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Re: Using Double-sided Presensitized PCB (a technique)
« Reply #27 on: April 28, 2010, 07:47:46 PM »
Pinaka fastest way for simple phenolic boards is. Punta ka sa bookstore or library. Wag kang magpapahuli huh. Meron usually paper cutter. Ibagsak mo lang ung cutter dun ng malakas ung PCB. Instant hiwa at diretso pa. Ngaun kung purol ung blade indi uubra ito.

At home I have an industrial cutter pang putol ng papel kahit 2 inch kapal napuputol nya. Same din ung principle at nakakapag hiwa ng pcb within less than 10seconds. Save the trouble cutting your fingers with the hand cutter.

Offline mArKhAo

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Re: Using Double-sided Presensitized PCB (a technique)
« Reply #28 on: April 28, 2010, 11:32:59 PM »
yan ba ung ginagamit din sa book binding? ;D ;D meron ung kakilala ko, kasing laki ng 1.5x1.0 meter, pwede sakyan ung handle ng  pang hiwa... hehe
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Offline franzschluter

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Re: Using Double-sided Presensitized PCB (a technique)
« Reply #29 on: April 28, 2010, 11:41:41 PM »
UU may printing press kase dati me negosyo. Tama hula mo pang book binding sya. 1.5m X 1m din sya hehe

Offline mArKhAo

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Re: Using Double-sided Presensitized PCB (a technique)
« Reply #30 on: April 28, 2010, 11:44:15 PM »
hehe, pang cut un ng makakapal na libro e... ung tipong mga 3 inches... swabe din naman ang cut, pag matalas ang talim, sa pcb ba, hnd nabibiaak ung board? hehe, parang overkill yon sa pcb ah.. hehe
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Offline franzschluter

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Re: Using Double-sided Presensitized PCB (a technique)
« Reply #31 on: April 29, 2010, 12:10:31 AM »
Hindi sya bibiyak as long as perfect ung cutting clearance nya. If it can cut paper then it can cut PCB. Pag kailangan pa ng two papers patung patung then it means hindi na maganda cutting clearance or pangit ung blade. Nabibili din mga paper cutters ng mura sa tabi tabi or DIY nyo nalang.

Eto Sample pics.
http://www.print-a-sign.co.uk/Metal-Shears.htm
http://www.ospcb.com/PCB_hand_cutter-Eng.htm

Pinagkaiba lang sa paper cutter is ung force is easier to apply kase iba ung mechanics. In short mas matigas sa paper cutter. Pero 1 good bang oughta do the trick. It works all the time. Also place the PCB closest to the hinge not handle. ;) Some old fashioned prof in my older days taught me to use hand cutters. But I found it really annoying and time consuming. Till I got impatient and tested it on a paper cutter which worked fine. The industrial cutter can even do 5 PCBs at a time. Sa paper cutter pwede 2 at a time basta malakas ung braso mo at mabilis ung momentum. ;)

Hindi naman over kill. Intended ko mag run ng mini PCB fab kase so requirement ko talaga mag putol and to downsize mga malalaking PCB FR4. Kaya aus lang.

Offline mArKhAo

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Re: Using Double-sided Presensitized PCB (a technique)
« Reply #32 on: April 29, 2010, 12:15:55 AM »
 meron pala naman talagang dedicated na pang cut ng pcb na ganyan e.. .hehehe siguro, industrial applications na un, hanggang hobbyist lng kasi ako ;D ;D ;D



^ito ung piksur dun po sa link nyung isa ;D
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Offline franzschluter

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Re: Using Double-sided Presensitized PCB (a technique)
« Reply #33 on: April 29, 2010, 12:28:26 AM »
yup halos wala pinagkaiba sa paper cutter. mura lang talaga ung ganyan wala pang 500php

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Re: Using Double-sided Presensitized PCB (a technique)
« Reply #33 on: April 29, 2010, 12:28:26 AM »

 

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