DAC 2496 (AK4393) DAC KIT With CS8416+AK4393+5532 - Page 222 - diyAudio
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Old 4th November 2012, 12:05 PM   #2211
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Quote:
Originally Posted by qusp View Post
erm, what possesses a sane human being to deliberately verify if the opamp works backwards
the guy was far from sane, as i later found out
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Old 4th November 2012, 07:58 PM   #2212
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Quote:
Originally Posted by PreSapian View Post
the guy was far from sane, as i later found out
@PreSapian: how did you find out that the was insane? (besides backwards testing of an op-amp)
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Old 5th November 2012, 06:08 AM   #2213
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it's a long story but he started arguing with me thinking that i was trying to rip him off when i suggested him that he would get the best fidelity out of usb instead of coax. (on a tda1541 dac that i was going to build for him)

his illogic in reaching that assumption was ridiculous.
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Old 5th November 2012, 11:14 AM   #2214
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Just been looking at SMD soldering videos on Youtube, which lead me into looking at videos for soldering ics using a flux pen.

I wish I'd looked at these before ordering from Along, as I then would'nt have asked to have the ics soldered for me.

I see there are rosin and non rosin flux pens - which would suit our purposes better of the two types?

These flux pens have to be ideal for soldering op-amps as well. Interestingly chisel tips (my favourite) are used with flux pens.

I've seen a module of two OPA627AU for $20 - does the price sound right/what does 'AU' signify and the module pins seem to have a much larger footprint than an op-amp. Is this an optical illusion (the camera can and does lie). If it is not an illusion can the module pins be bent to fit? Thanks in advance for answers.
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Old 5th November 2012, 12:01 PM   #2215
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Quote:
Originally Posted by Black Stuart View Post
I've seen a module of two OPA627AU for $20 - does the price sound right/what does 'AU' signify and the module pins seem to have a much larger footprint than an op-amp. Is this an optical illusion (the camera can and does lie). If it is not an illusion can the module pins be bent to fit?
AU simply means it's the SMD version (SO8 package).

AU pins are spaced like all others SO8 opamps (1.27mm).
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Old 5th November 2012, 05:00 PM   #2216
jimchan is offline jimchan  Norway
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just replaced the 7912/7812 voltage regulators with Salas power supplies (OPA827).

Really impressive improvement, sound is very authoritative now. Removed a lot of harshness (despite the 7X12 being lower noise versions).

I am considering using the final Salas board for the +9v supply. Anyone with opinions as to whether this will make a difference?

jim.
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Old 5th November 2012, 05:25 PM   #2217
50AE is offline 50AE  Bulgaria
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Why don't you use directly 3,3V and 5V salas shunt removing the final SMD regulators? You will squeeze most performance this way.

AK4396 can use a 5V rail for both analog and digital sections. Although a separate for digital is recommended.

The CS digital chip needs 3,3V though.

I found a way combating the offset voltage and using no cap. One Ni-Mh + Ni-Cd = almost 2,5V and few mV which won't hurt my amp bias very much.

The problem is, this chip doesn't drive capacitance very well (25pF by datasheet), so should a 1k resistor in series help? I have about 100-150pF of capacitance to drive (Miller and cable).

Last edited by 50AE; 5th November 2012 at 05:31 PM.
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Old 5th November 2012, 05:42 PM   #2218
jimchan is offline jimchan  Norway
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Well spotted....I could use a 5v salas for both the analog and digital power for the AK4396, or even just leave the 3.3v as it is.

My transformer only has single 9v output....is it OK to have that driving two bridge rectifiers (the 7809, and the 5v salas) ?

not sure what you mean by the capacitance / offset issues.

Last edited by jimchan; 5th November 2012 at 05:45 PM.
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Old 6th November 2012, 05:59 PM   #2219
knorst is offline knorst  Germany
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Join Date: Oct 2012
Hello all,

finally i got my Dac kit already soldered shipped form singapore.
It seems that pin 27 and 28 from the AK4396 chip are connected together via a small spot of solder.

Now before using the dac and applying the BOM, i wonder if this happenend maybe accidentally by the supplier.

When I look at the shematic posted by dario it seems no problem, because pin 27 and 28 of the AK4393 are connected both to ground anyway.

But the shematic refers to the AK4393.
Is this maybe the same with the AK4396 or should i try to desolder the connection?


regards Knorst
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Old 6th November 2012, 06:27 PM   #2220
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hi clave.
1. i'm going to attempt this board with assistance from my father!
which would you recommend more 4393 or 4396?
2. been meaning to give it a go for some time and have your bom etc. not sure if it's the final one, could you provide links again please - can't find it in search.
3. does the shunt make much difference at all? only, being a novice noob, i'm guessing i'll be content with the sound without the shunt.

many thanks
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