A nice dac to complement the Aleph-X.

[LBHajdu]

I just got a 1706 from burr brown. My first reaction was wholly how am I supoed to solder this???? The leads are so close together that I can hardly get a sheet of paper in-between them. This surface mount stuff always looks bigger in pictures. One of my teachers suggested rubbing solder all over the leadS then heating it to make it stick to the PCB and then removing the solder by pulling it away with the soldering iron. I am skeptical that this will work. I hope the SCIC package is bigger then the SSOP.

[tg3]

Originally posted by LBHajdu
I just got a 1706 from burr brown. My first reaction was wholly how am I supoed to solder this???? The leads are so close together that I can hardly get a sheet of paper in-between them. This surface mount stuff always looks bigger in pictures. One of my teachers suggested rubbing solder all over the leadS then heating it to make it stick to the PCB and then removing the solder by pulling it away with the soldering iron. I am skeptical that this will work. I hope the SCIC package is bigger then the SSOP.

Over at the Seattle Robotics site, here is an article on SMT soldering using water based solder and a <B>toaster oven</B>.

Have You Seen My New Soldering Iron? - Kenneth Maxon

[uli]

Originally posted by LBHajdu
I just got a 1706 from burr brown. My first reaction was wholly how am I supoed to solder this???? The leads are so close together that I can hardly get a sheet of paper in-between them. This surface mount stuff always looks bigger in pictures. One of my teachers suggested rubbing solder all over the leadS then heating it to make it stick to the PCB and then removing the solder by pulling it away with the soldering iron. I am skeptical that this will work. I hope the SCIC package is bigger then the SSOP.

Hi Leve,
I always solder those devices with 1/40" spacing with silver
solder (extra thin) and a flux liquid put on all pads this makes
very professional looking solder joints and prevents the silversolder from making shortcuts. Of course you have to use
a high grade soldering iron with very fine tip. I use a metcal
professional station (got it as surplus from my company)
Uli

[promitheus]

to solder smds , you don´t have to solder the pins separately.
Solder the whole side of the IC without overheating it. the whole side will be short circuited but dont worry yet. Using a solder wick or a special tip suck the solder out again. the pins stay soldered but you have to be sure no solder is in between the pins. I do this everyday, so it works for sure. I solder 160 and 200 pin ICs so no problem for such a small IC.

[Variac]

the info is on the wiki

[LBHajdu]

I just had an idea. Many Threads have been submitted on the forum about building a Dolby Digital decoder. All of them have ended in failure for the reasons : you need some type of document from Dolby just to buy these chips, you need a microcontroller to run the chip, and the schematic for it is huge. While I was on the net I fount this little device. It’s called the External DD5.1/DTS Decoder, Jazz Speakers DE-005. It’s made for a computer MM system. It uses the Dolby Pro Logic/Dolby Digital/MPEG2 stereo/DTS decoder CS4926 04 CL from Crystal Semiconductor. I don’t have a price for this thing, but it can’t be very costly, my guess would be about $150. So what’s to stop us from tapping the Pins of the CS4926 and stealing the PCM output of the decoder and sending in to the front and of the DAC where working on ??

[uli]

Hi Leve,
after looking at [url]www.crystal.com/products/[(url]
and downloading and reading and thinking........
it should be possible. As this CS4926 has just 20bit
output I wouldn´t pay for PCM1704U-K (6times 32.-USD)
but with some deltasigma chips from TI f.k.a.BB
(formerly known as BurrBrown )
and 6 times NP´s or the tweaked output should be
nice indeed.
Couldn´t you check price and availability of that board?

Uli

[uli]

Originally posted by uli
Hi Leve,
after looking at [url]www.crystal.com/products/[(url]
and downloading and reading and thinking........

Uli

Ok, 2 fingers on the keyboard is one too many



www.crystal.com/products

Uli

[LBHajdu]

It looks like i guessed the price just right. Exactly $150 and that was just a guess at the time. I’m still looking for a better solution. If money where no object I would go with the MDP-3X MULTIPLE DIGITAL PROCESSOR from http://www.msbtech.com/ . It comes with a decoder and 3 PCM outputs right on the back so I don’t have to do any work. Why couldn’t more makers of DVD players think of that? However its way over priced.

My first choice for a 20bit or 18bit dac is still the very highly regarded PCM63.

[uli]

Originally posted by LBHajdu
My first choice for a 20bit or 18bit dac is still the very highly regarded PCM63.

Hi Leve,
the PCM63 is obsolete

BTW cost no object: PCM1704 in 20bit mode!(just one pin hi/lo)
but for home cinema (noise) 6x PCM1704 it´s overkill.

Uli