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PostPosted: Sat Jun 03, 2017 12:20 pm 
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Location: Toronto, ON, CA
bolly wrote:
cool thread Frank Wang! here is my new old DAC chip


Cool chip only used in Marantz machines...

Just Frank...Wang is not my last name ... too late to change the ID now...;-(


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PostPosted: Sat Jun 03, 2017 12:59 pm 
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bolly,

Saw you asked about the sockets...

I did not plan to work on this DAC yet, and normally should start with smaller/lower parts to taller parts (soldering sequence)...today I just solder the socket to illustrate how I plan to use them...

Frank


Attachments:
File comment: Normal 28pin socket (pins with plastic to form the socket)
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File comment: I will strip away the plastic ...
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File comment: soldered...
IMG_0996.jpg
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IMG_1004.jpg
IMG_1004.jpg [ 233.49 KiB | Viewed 527 times ]
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PostPosted: Sat Jun 03, 2017 1:02 pm 
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Location: north bay, ON, CA
did you strip away the plastic socket from the pins for cooling?


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PostPosted: Sat Jun 03, 2017 1:10 pm 
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bolly wrote:
did you strip away the plastic socket from the pins for cooling?


You got me :D

-For this particular DAC, I intend to use socket due to these PCBs are multi-layered, hard to remove in case want to remove the IC;
-The socket is gold plated cooper, I won't worry about the negative impact to sound for these chips...
-Removing the plastic: dielectric constant (not really matter in this case, but I feel better)...and better for heat dissipation...


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PostPosted: Sat Jun 03, 2017 1:14 pm 
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cool 8)

I cant desolder my old chip yet, I have a Chinese copy soldapullt and it doesn't suck too good!


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PostPosted: Sat Jun 03, 2017 1:17 pm 
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bolly wrote:
cool 8)

I cant desolder my old chip yet, I have a Chinese copy soldapullt and it doesn't suck too good!


Check my posts in this thread..I used solder-wick to remove the chips.

Based on my experience, soldapullt is not the right tool to desolder chips...it better fits to suck/remove big chunk of solders (if use solder-wick in this case, will be a waste), and not suitable to remove residual of solders which in most cases are the "last inch" which hold the parts on PCB.
Solder-wick, on the other hand, more suitable to remove small amount of solder (large pile of solder is also ok, but will be a waste)...it basically is copper braid with flux, absorb solder from PCB...
Other ways to remove multiple legs parts including hot gun (never use this one)...I normally use a metal wire (e.g. resistor's leg) to connect solder pads of the parts, then apply solder gun against the wire, so that the part's legs solder could melt simultaneously...or, pile a whole bunch of solder which cover all solder pads of the part same deal...


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PostPosted: Wed Jun 14, 2017 9:43 am 
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thanks for your advice Frank!

By the way, I found another old chip for my collection!! 8)


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my S1crownchip HSH8931.jpg
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PostPosted: Thu Jun 15, 2017 5:00 am 
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bolly wrote:
thanks for your advice Frank!

By the way, I found another old chip for my collection!! 8)


Gee! How many do you possess? You need a good, solid robbery :lol:

Got some parts from Mouser yesterday, will start work on this DAC soon...


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PostPosted: Wed Nov 08, 2017 7:32 pm 
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Done for a while...too busy at work...now post some photos...

Those tiny SMT parts were a pain...so tiny...


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IMG_1611.jpg
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PostPosted: Thu Nov 09, 2017 8:05 am 
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Location: Thornhill, ON, CA
No soliciting here but I have a CDX-800U Yamaha since new 1988 with a busted drawer if anyone wants the DAC or parts. It uses an 18 bit "hi bit" DAC. FREE Just PM me.

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