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Old 20th March 2004, 09:12 PM   #1
wmincy is offline wmincy  Malaysia
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Default problem with SMD DACs

hello guys,

recently i got some SSOP to DIP converter intending to start with some audio DAC projects using PCM1730 and AD1853 (you can see the attached picture)
I used the normal soldering iron to mount these SMD chips adding disoxidant paste. I'm not sure if it's right or not, or maybe the too much heat provoked damage to the chips, the DACs never function as they should be after I connected them to the circuit. As I turned on the power I could hear more noises and hisses than the sound, and it was intermittent and low. After a few seconds there is no sound but hisses and the chip started to become hot (but not exageratedly hot), no smoke no short, but still no sound .
I don't want to surrender in front of the problem. I tried checking many time the connection but nothing .
Can somebody give me suggestions and helps?? Thanks in advance.

Mincy
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Old 20th March 2004, 09:20 PM   #2
wmincy is offline wmincy  Malaysia
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Default re.....

is there any particular technic to solder SMD chips?? or particular attention to pay when soldering??

My previous DACs, PCM1710 and PCM1716, do function well
.....arggghhhhh.......


Ah, I forgot to say that the DIR actually is a CS8412.
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Old 21st March 2004, 03:11 PM   #3
Stones is offline Stones  United States
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Default Re: re.....

Quote:
Originally posted by wmincy
is there any particular technic to solder SMD chips?? or particular attention to pay when soldering??
have a look at

anyone interested in a jung regulator pcb group buy?

post 92 and 93 hope it helps you
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Old 24th March 2004, 04:46 PM   #4
leon is offline leon  Greece
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Default Soldering paste

I had big problems with SMD and soldering paste. My DAC worked only after I cleaned very well the chip with a spray.
In the second same DAC I built I used no soldering paste and it worked without problems. I was also told that there is a special spray you could use.
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Old 24th March 2004, 04:57 PM   #5
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Hey....if a guy over 50, with eyes too bad to get into the Army during 'Nam can do it...............

My trick:

I tack one lead on each corner with fresh solder. There is usually enough reflow left on the board that I can heat each pin individually, and it will suffice.

Jocko
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Old 24th March 2004, 07:06 PM   #6
dggs is offline dggs  United States
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Use water soluble liquid flux. Rinse with water after soldering.
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Old 24th March 2004, 07:29 PM   #7
dggs is offline dggs  United States
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If you don't want to buy a whole gallon, get a flux pen.
http://www.digikey.com/scripts/DkSea...S&Cat=32637666
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Old 26th March 2004, 10:53 AM   #8
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Where can you get the converter thingies for SSOP into DIL?? I have only found a couple at farnell and they cost like 50

Im sure you should be able to get these cheaper but from where?

Cheers Matt
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Old 28th March 2004, 11:51 AM   #9
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I think these guys have it for around $11.

http://cimarrontechnology.com/
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Old 30th March 2004, 08:11 PM   #10
wmincy is offline wmincy  Malaysia
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hey 5th element,

it was really lucky for me to find the converter at a very low price (around 3 including shipment). I found it in a japanese web site, here is the site: http://www.nomura-e.co.jp/henkan.html
Just deal with Ms Yuko Nomura, she is responsable for sales.


Leon, Jocko, which type of soldering iron you are actually using for SMD chips? can you suggest me for i'm going to buy one, thks


Mark, by your experience, those SMDs are burnt? Isn't it hard to have SMD soldered with a lower temperature? thks
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