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Old 28th January 2012, 09:51 PM   #1151
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Default Batterian PSU

the 5V rail recommendation from AKM data sheet is 4.75 - 5.25V. Max 6V ok?
the 3.3V rail between 3V - 5.25V max 6V ok?
it means 4 of AA batteries 6V can handle it, doesn't? 4+4 pack for more lasting.

the 3.3V rail for CS8416 recommendation from CirrusLogic is 3.1 - 3.46V and again max 6V!
and again, a pack of 3 AA batteries 4.5V would not bee nice? or 3+3 more lasting. quiet cheap.

appreciate for any . . .
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Old 29th January 2012, 12:04 AM   #1152
kevinkr is offline kevinkr  United States
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OT post moved to Shiga Clone thread per member request.
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Old 29th January 2012, 02:14 PM   #1153
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Clave,

You specify in your BOM R2.2K for R24..R34 for the LPF. Shouldn't the value be 2.4K. Typo?

What am I missing?

Greg
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Old 29th January 2012, 02:29 PM   #1154
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Quote:
Originally Posted by ggetzoff View Post
You specify in your BOM R2.2K for R24..R34 for the LPF. Shouldn't the value be 2.4K. Typo?
The exact value is 2.4K but I can't find PRPs in that value, so I've buyed 2.2K.

They works perfectly and the tonal balance seems right.

So if you can find 2.4K better, if not 2.2K are also OK.
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Old 29th January 2012, 02:39 PM   #1155
NebuK is offline NebuK  Germany
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Heyyas,

in the last days i've invested quite some time to rework my board. I've applied excessive amounts of flux and made sure every solder joint is perfectly clean and not "dry". I've then scratcher (with a small screwdriver) between *all* the close pads/joints. After that i soaked the board with some "cleaning alcohol" (don't know whats the english word for it, sorry) and scrubbed it clean with q-tips. Very very clean - i've done this multiple times until i could see no remains between any closer pair of pins. Everything that remains is some of the (again, missing a word...) "barfing agent" which is in the cleaning-alcohol that doesn't evaporate - a slight grey fog. Not trusting this i've measured the resistance between some very close pins with much of that agent, its quite too high for my DMM to measure.

I've also cleaned the board with a vacuum cleaner and blown every small particles off with a pressure-air-gun. Then i've checked the damn thing with the schematic another couple of times. On the other board i have all i've done is reversing the cap close to the opa into the right direction (both of them still work, as i've tested off-board).

Then i've tested both boards. Both still do get "hot", as in ~50-55*C for the 7812, ~50*C for the 1777-5v and ~45*C for the AK. Tough luck - it still happens on both boards. On the other side, as it *does* happen on both boards i doubt this is a bad-joint-problem. As it only happens to the ak/1117-5v/7812, not to the other 1117s, or 7912/7805 i doubt its a oscillation or otherwise regulator/capacitor related problem. As it does happen on both boards, a bad AK is unlikely.

So ... here i'm standing, still as dum as before :/.

Thanks again and kind regards
- Dario

PS: as everything works perfectly, i'm starting to thinking that i might leave it like this. On the other hand - i really really don't see why the f... my DAC should be hotter than my gainclone ... *grrr*
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Old 29th January 2012, 11:35 PM   #1156
erin is offline erin  Australia
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NebuK, as I wrote earlier, if sound comes out, without distortion, then don't worry about it. If or when something fails you will be able to replace any failed parts very cheaply and easily. I don't think the temperatures you mentioned are anything to worry about.
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Old 30th January 2012, 04:28 PM   #1157
fulvio is offline fulvio  Italy
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NebuK, I think the temperatures you measured are correct.
Consider the 1117-5: the dropout is 12-5 = 7 V, the current drawn from the AK4396 is 32 mA (from AK datasheet, typ. value), so the power dissipated in the 1117 is 224 mW.

The thermal resistance of the 1117 (junction to ambient) is 136C/W, so the junction temperature will be 30.5C over the ambient; assuming ambient is 22C, the junction temperature will be 52.5C.
The junction to case thermal resistance of the 1117 is 15C/W, so the 1117 case will be 3.6C less than the junction, that is about 49C, very near to the one you measured (50C)

You dont have to be worried about these temperatures, they are quite normal.
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Old 30th January 2012, 05:34 PM   #1158
ptempel is offline ptempel  United States
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Was looking at the full BOM posted by ClaveFremen (Dario) in post 1125:

DAC 2496 (AK4393) DAC KIT With CS8416+AK4393+5532

Only two questions on it. Can I replace the 0.1uF Evox-Rifa SMR cap with either Wima pulse film or poly film? Its out of stock at Mouser and couldn't find it at Digikey and Newark. Also, does anyone have a part number or name for the two inductors are (L1 and L2)? Kudos to Clave and all the others for all the testing that was done with this DAC. Was looking at the CS8416 datasheet and are you sure that L1 and L2 are not ferrite beads?

Thanks,
Philippe

Last edited by ptempel; 30th January 2012 at 05:44 PM.
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Old 30th January 2012, 07:55 PM   #1159
50AE is offline 50AE  Bulgaria
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I'm really curious of trying this DAC on SLA battery power supply. I will try and post results.
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Old 31st January 2012, 01:37 PM   #1160
ptempel is offline ptempel  United States
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Looked at some more photos of the board and I think L1 and L2 are ferrite beads. I put the Panasonic ones from Mouser (667-EXC-ELSA35) on my copy of the BOM. Also am substituting Vishay/Roderstein metallized polypro cap from Partsconnexion (VISROD-72943) for the Evox-Rifa one. Let me know if I'm off the beam on them.

Thanks,
Philippe
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