DAC 2496 (AK4393) DAC KIT With CS8416+AK4393+5532 - Page 20 - diyAudio
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Old 21st June 2011, 12:07 AM   #191
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Quote:
Originally Posted by jean-paul View Post
- it really needs a heatsink on the 7812 when the original R core transformer is used.
Mine measures 60C, it's too much?

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BTW the R core is absolutely quiet, very nice quality !
Absolutely!

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- it needs a 100 Ohm resistor at each of the L + R outputs of the opamps to the RCA sockets
Why? To adjust output level?

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Originally Posted by jean-paul View Post
- my 2 different FN1242A (Fluency) DACs eat it for breakfast in terms of quality but they are more noisy.
Did you do experiments also with caps?

They make a BIG difference...

Particularly the film caps aroud the opamp, the EROs are fine but Wima FKP2s are in another league...

Also Aluminun Solid caps are a big improvement for all digital PS in this DAC.

So far I've briefly tried (fresh, not burned in) Sanyo Oscon SEPC 470uF 6.3V, Fujitsu 100uF 16V and Sanyo WG 1000uF 6.3V (not solid), Nichicon LS 150uF 10V, NCC PSA 220uF 6.3V and finally Sanyo Oscon SC100uF 16V.

SEPCs, Fujitsu and WGs seems best but all of them are way better than stock caps.
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Old 21st June 2011, 06:14 AM   #192
col_s is offline col_s  Australia
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Originally Posted by ClaveFremen View Post


Why? To adjust output level?
it helps opamp stability into capacitive loads

ADI - Analog Dialogue | Capacitive loading
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Old 21st June 2011, 06:32 AM   #193
col_s is offline col_s  Australia
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On that topic... Looking at the schematic i see that the 3.3V and 5V regulators are LM1117. You should be careful using low ESR caps on their output. From the datasheet "The output capacitor is critical in maintaining regulator stability, and must meet the required conditions for both minimum amount of capacitance and ESR... The ESR of the output capacitor should range between 0.3Ω - 22Ω"
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Old 21st June 2011, 07:04 AM   #194
awpagan is offline awpagan  Australia
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On that topic... Looking at the schematic i see that the 3.3V and 5V regulators are LM1117. You should be careful using low ESR caps on their output. From the datasheet "The output capacitor is critical in maintaining regulator stability, and must meet the required conditions for both minimum amount of capacitance and ESR... The ESR of the output capacitor should range between 0.3Ω - 22Ω"
That is a good point.
but if you look at the distance of the track between the caps and the lm117's.
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Old 21st June 2011, 07:42 AM   #195
col_s is offline col_s  Australia
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That is a good point.
but if you look at the distance of the track between the caps and the lm117's.
there seems to be an output cap quite close to each regulator. I'm not sure those traces are long enough to negate the other decoupling caps from the impedance that the regulator "sees".
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Old 21st June 2011, 12:00 PM   #196
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it helps opamp stability into capacitive loads

ADI - Analog Dialogue | Capacitive loading
Indeed, it should be there as I found out with long cabling.

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When you say 'Noisy', do you mean in terms of noise floor level ?
Yes, I meant that (in broken english)


ClaveFremen, I do experiment with caps but I found my example has fine caps so I kept it like it is for now. Nichicon PW is good.
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Last edited by jean-paul; 21st June 2011 at 12:17 PM.
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Old 21st June 2011, 01:16 PM   #197
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Quote:
Originally Posted by ClaveFremen

Mine measures 60C, it's too much?.
The reg does not mind but the cap will eventually. A heatsink will prolong the life of the cap considerably.
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Old 21st June 2011, 03:56 PM   #198
palmito is offline palmito  United States
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- my 2 different FN1242A (Fluency) DACs eat it for breakfast in terms of quality but they are more noisy.
jean-paul, which are the two Fluency DACs you are comparing this DAC to? Are they in the same price range? On last question, the quality is better overall, better detail, transient response, etc. or in specific areas?

Thanks!
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Old 21st June 2011, 07:35 PM   #199
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Both Fluency DACs are made by myself (based on japanese kits) and they are somewhat more expensive. One has DIR9001 and the other the CS8416. The one with the DIR has only been briefly tested as I am still building it into a case. They are more musical and feel more like the real thing. It is a pity I don't have any WM8740/CS4397 DACs anymore as I get the feeling those were also better than AK4396. Especially the CS4397 is a very good DAC. I am aware that I should put more time and effort in the AK4396 DAC but in this form it was worse than the original AD1981B DAC in my Hifidelio transport which disappointed me as most DACs I built and tried were easily better than the AD1981B. I tested the AK4396 with long cheap lead wires with the bare PCB's just mounted on a aluminium sheet just like I do with all DACs I make. Just to put things inprespective....

FN1242A has the drawback that is has a higher noise floor which is audible but that does not bother me very much. It is just that I know that it shouldn't be like that in 2011
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Old 21st June 2011, 07:48 PM   #200
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ClaveFremen, I do experiment with caps but I found my example has fine caps so I kept it like it is for now. Nichicon PW is good.
I wasn't referring to PWs, I do agree they're fine.

I was talking about opamps filter caps and DAC's and receiver's PS decoupling caps.

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