Author Topic: to SMD or not SMD... (Read 7018 times)

insomartin · « **Reply #20 on:** August 12, 2009, 03:32:48 AM »

iniisip ko baka walang headers na available locally. hanap muna ako nang solution about it. daan ako egizmo bukas.

Philippine Electronics Forum · « **Reply #20 on:** August 12, 2009, 03:32:48 AM »

updated · « **Reply #21 on:** August 12, 2009, 09:53:40 AM »

Philippine Electronics Forum · « **Reply #21 on:** August 12, 2009, 09:53:40 AM »

Born2BeWired · « **Reply #22 on:** August 12, 2009, 10:00:32 AM »

When selecting a QFP breakout board, pick the one with the smallest size: Usually these are laid out using short traces, that is what you want. The parasitics introduced by long traces, especially when there is no ground plane underneath, can be quite problematic when signals switches at nanoseconds speed.

That being said, the layout shown by sir Marcelino is preferrable. Mas OK pa sana kung yung gumawa nito naglagay ng ground plane, double side naman ito.

Important reminder: install a power supply bypass capacitor on-board.

Philippine Electronics Forum · « **Reply #22 on:** August 12, 2009, 10:00:32 AM »

marcelino · « **Reply #23 on:** August 12, 2009, 12:01:24 PM »

Quote from: Born2BeWired on August 12, 2009, 10:00:32 AM

When selecting a QFP breakout board, pick the one with the smallest size: Usually these are laid out using short traces, that is what you want. The parasitics introduced by long traces, especially when there is no ground plane underneath, can be quite problematic when signals switches at nanoseconds speed.

That being said, the layout shown by sir Marcelino is preferrable. Mas OK pa sana kung yung gumawa nito naglagay ng ground plane, double side naman ito.

Important reminder: install a power supply bypass capacitor on-board.

oh.... ganun pala yun.
will look up on those details sir...

this afternoon, i will attempt to make a breakout out of presentized PCB. ewan ko lang kung kakayanin! hehehe

Philippine Electronics Forum · « **Reply #23 on:** August 12, 2009, 12:01:24 PM »

Mayalin22 · « **Reply #24 on:** August 12, 2009, 12:51:35 PM »

http://www.electronicslab.ph/forum/index.php?topic=6816.msg124599#msg124599

naghahanap din ako ng 80 pin... hanggang ngayon di ko pa nakukutingting Pic18F8720 ko

Philippine Electronics Forum · « **Reply #24 on:** August 12, 2009, 12:51:35 PM »

marcelino · « **Reply #25 on:** August 12, 2009, 01:10:53 PM »

Quote from: coOLet on August 12, 2009, 12:51:35 PM

http://www.electronicslab.ph/forum/index.php?topic=6816.msg124599#msg124599

naghahanap din ako ng 80 pin... hanggang ngayon di ko pa nakukutingting Pic18F8720 ko

ive seen a lot in ebay...

insomartin · « **Reply #26 on:** August 12, 2009, 01:35:19 PM »

if ever that's i'm going to design a breakout board... and mainly na dsp or high speed mcu's diba may crystal osc din? should i implement that aslo kasi wala sa mga standard breakouts.wala pa naman akong PTH... grrrrr.

insomartin · « **Reply #27 on:** August 12, 2009, 02:40:25 PM »

my design
* Ultra Short Traces
* could contain crystal osc and few things...
* much smaller than the first one i did...
* much smaller than 80 pin adapter of eeteam...
* or the whole board itself

shmart boards
- long leads
- expensive.

eeteam.com...
- saan meron nito? (availability)
- pth.

insomartin · « **Reply #28 on:** August 12, 2009, 02:46:42 PM »

RaffT · « **Reply #29 on:** August 12, 2009, 03:04:49 PM »

how much?

insomartin · « **Reply #30 on:** August 12, 2009, 03:21:42 PM »

i think ok na ako sa 400 petot. masaya na ako dun. pwede din BEER.
shipping not included. negotiable yung 400 at kung ilang pcs.
buy 3-4 pcs or more pcs para considerable na agad yung price.
but kung isa lang 400 talaga. matrabaho sa pagsetup nang cnc, photolithography, developing at etch.

insomartin · « **Reply #31 on:** August 12, 2009, 03:30:51 PM »

i'll customize to your needs btw. if you wanted it with copper pour, smd pads...

updated · « **Reply #32 on:** August 12, 2009, 05:05:05 PM »

Quote from: Martin Mystère on August 12, 2009, 03:30:51 PM

i'll customize to your needs btw. if you wanted it with copper pour, smd pads...

Sir Martin,

interested po ako. magkano po ba kung 75mmx75mm.puro 4 dip ic lang at puro resistor na laman,

pinaka konti siguro ay 10pcs papagawa ko. kung matuloy po yung ginagawa ko. thanks. at pacheck po ng pin n2 KBPC3510, may gagawin din akong pcb n may 2 ganyan, at may butas sa gitna for the screw, need to solder the bridge.. salamat po..

marcelino · « **Reply #33 on:** August 12, 2009, 05:12:35 PM »

Quote from: Born2BeWired on August 12, 2009, 10:00:32 AM

When selecting a QFP breakout board, pick the one with the smallest size: Usually these are laid out using short traces, that is what you want. The parasitics introduced by long traces, especially when there is no ground plane underneath, can be quite problematic when signals switches at nanoseconds speed.

That being said, the layout shown by sir Marcelino is preferrable. Mas OK pa sana kung yung gumawa nito naglagay ng ground plane, double side naman ito.

Important reminder: install a power supply bypass capacitor on-board.

sir born, i just realized... di naman pala pwedeng may capacitor sa board. for instance for 100-pins, meron nito ang microchip meron din ang zilog or kahit anong company... e di naman parepareho ang ang pin configurations nila... so shorter lead lang at with ground plane siguro.

with 64-pins, i was not successful using mg inkjet printer. try ko makiprint sa laser. i used 10mils for the traces.

insomartin · « **Reply #34 on:** August 12, 2009, 05:20:43 PM »

pero wala akong die punch para sa terminals nang KBPC3510 bridge. wala pa kasi akong router bit sa makina ko. mimill ko na lang sana. nagsisimula pa lang ako sa raket kong ito. 175 per piece sa 10 pcs. single sided. 3 by 3 inches.

insomartin · « **Reply #35 on:** August 12, 2009, 05:34:18 PM »

Quote from: marcelino on August 12, 2009, 05:12:35 PM

sir born, i just realized... di naman pala pwedeng may capacitor sa board. for instance for 100-pins, meron nito ang microchip meron din ang zilog or kahit anong company... e di naman parepareho ang ang pin configurations nila... so shorter lead lang at with ground plane siguro.
with 64-pins, i was not successful using mg inkjet printer. try ko makiprint sa laser. i used 10mils for the traces.

sir marce. try my film! reusable, UV stable, does not WRINKLE, and perfectly OPAQUE!
i'll send a sample film!
para ma evaluate nyo din.

guys if you want a free sample PM me your postal address.

updated · « **Reply #36 on:** August 12, 2009, 05:34:55 PM »

ahh. thanks, alanganin kasi size nun. mahirap magbutas. at kailangan ko i solder siya sa pcb. sana may mas mura pa kasi po posible na maging more than 20 yung 3x3. nasa proseso parin ako. kapag nakuha ko full details pm kita. may sample picture ka po ba?

salamat

updated · « **Reply #37 on:** August 12, 2009, 05:38:16 PM »

Quote from: marcelino on August 12, 2009, 05:12:35 PM

sir born, i just realized... di naman pala pwedeng may capacitor sa board. for instance for 100-pins, meron nito ang microchip meron din ang zilog or kahit anong company... e di naman parepareho ang ang pin configurations nila... so shorter lead lang at with ground plane siguro.

with 64-pins, i was not successful using mg inkjet printer. try ko makiprint sa laser. i used 10mils for the traces.

master,
ano po gamit mong film?

insomartin · « **Reply #38 on:** August 12, 2009, 05:46:38 PM »

here's mine. sa inkjet gamit ko dati drafting paper.

sa laser naman toner transfer. kasi hindi ganun ka black printer ko.

marcelino · « **Reply #39 on:** August 12, 2009, 05:50:43 PM »

Quote from: Martin Mystère on August 12, 2009, 05:20:43 PM

pero wala akong die punch para sa terminals nang KBPC3510 bridge. wala pa kasi akong router bit sa makina ko. mimill ko na lang sana. nagsisimula pa lang ako sa raket kong ito. 175 per piece sa 10 pcs. single sided. 3 by 3 inches.

Quote from: Martin Mystère on August 12, 2009, 05:34:18 PM

sir marce. try my film! reusable, UV stable, does not WRINKLE, and perfectly OPAQUE!
i'll send a sample film!
para ma evaluate nyo din.

guys if you want a free sample PM me your postal address.

sample... sure!

pero magkano nga yung pricing mo?

may nagawa ka na bang TQFP na more than 64 pins? yung PCB na... just wanna know the outcome.

Philippine Electronics Forum · « **Reply #39 on:** August 12, 2009, 05:50:43 PM »

Author Topic: to SMD or not SMD... (Read 7018 times)

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