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  1. #31

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    Quote Originally Posted by SCompRacer View Post
    Fox crystal....hmmmm, I see a trend here.
    Thats what came already installed.Not sure of the freq.stability spec.

  2. #32

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    I built up another one of these simple little DAC's so that I can do a comparison of two different D-A chips to see if I could discern any audible differences.Of course the quality of the power supplies and the analog output stages play a large roll but I'm curious to see if I can hear any differences between equally spec'd chips from two different companies.Namely the Cirrus CS4398 and AKM AK4396 both are 24bit/192 k Delta-Sigma differential voltage output devices.Other than the addition of a 16/48k non async USB input on the Cirrus board the two are near identical thus making it an apples to apples comparison.Both very similar PC board layouts,the same power supply scheme,and use the same Cirrus CS8416 digital input reciever.
    As with the original AKM board I used Panasonic FC series electrolytics for local decoupling ,and Panny stacked film's for supply bypassing.
    Aswell a BNC connector is used to assure proper 75 ohm termination impedance and a pulse transformer provides galvanic isolation from my PC's soundcard.The main filter caps in the second board are UCC's vs Nchicon's in the first.

    As the pics show I used another though slightly larger version of the cute little Hammond cases.After I'm finished with the comparo I will use the extra chassis space to beef up the main filter capacitance with the addition of an auxillary PC board with 4x 3900uf.
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    Last edited by FTGV; 02-25-2013 at 09:53 PM.

  3. #33

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    Outta curiosity whats something like this run you?
    Advice is free, the Flea Market is earned - F1Nut

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    HT: APC H15 | Pio 51FD | Uverse | Xbox 360 | Squeezebox Classic | Integra DTR 5.9 | Carver AV-705x & M1.0t MKII Opt002 | LSi 15 | LSiC | LSi F/x | Kimber Hero IC & 8VS SC

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  4. #34

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    Roughly $60-70 per completed chassis not including the external transformer.

  5. #35

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    Quote Originally Posted by FTGV View Post
    Roughly $60-70 per completed chassis not including the external transformer.
    Interesting......with the external transformer and chassis whats the total bill?
    Advice is free, the Flea Market is earned - F1Nut

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    HT: APC H15 | Pio 51FD | Uverse | Xbox 360 | Squeezebox Classic | Integra DTR 5.9 | Carver AV-705x & M1.0t MKII Opt002 | LSi 15 | LSiC | LSi F/x | Kimber Hero IC & 8VS SC

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  6. #36

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    The transformer was a freebie but you would be looking at $20-25 ish from places like Digi Key and Mouser.A suitable transformer is also available from the Asian ebay vendors for these PC boards or kits.

  7. #37

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    Forgot to mention the all important opamp used in both is an LME49720.

  8. #38

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    Nice work, Fred.

  9. #39

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    Nice work Fred! Like them enclosures.


    Quote Originally Posted by FTGV View Post
    Forgot to mention the all important opamp used in both is an LME49720.
    Great op amp! Fairly sure that is the one Twisted Pear uses on their I/V boards; both the IVY III and the SE ballsie stage of the Legato 3.1.
    Make yourself necessary to someone. Ralph Waldo Emerson

    Salk SoundScape 8's
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  10. #40

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    Thanks gents ,and yes Rich same opamp aas IVY III and Leg also known as the LM4562.And yes I have compred the little AKM to the Buf III ,this little vid depicts the outcome nicely.
    http://www.youtube.com/watch?v=wAIPKgQ5Kuo

    Quote Originally Posted by SCompRacer View Post
    . Like them enclosures.
    These guys apparently like'm too.http://www.belcantodesign.com/Belcanto_uLink.html

  11. #41

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    The finished product with RCA and BNC connectorss installed.For neatness sake I epoxied the pulse transformer directly to the body of the BNC con.
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  12. #42

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    That is a neat little package Fred. I like the pulse attachment.
    Make yourself necessary to someone. Ralph Waldo Emerson

    Salk SoundScape 8's
    Krell KRC-HR Class A Pre w/ Reference Phono
    Krell Class A KSA-250
    Harmonic Technology Pro 9+
    Squeezebox Touch / Welborne Labs PS / I2S Out Mod
    Denon 3910 w/I2S/DSD Out
    Twisted Pear Buffalo III Dual Mono ESS Sabre32 DAC
    Sennheiser HD650
    Heavy Plinth Lenco L75 Idler Drive
    AA MG-1 Linear Air Bearing Arm
    AT33PTG/II & Denon 103R
    Shunyata Hydra (Original)
    NHT B-12d subs
    GIK Acoustic Treatments


    CP Showcase

  13. #43

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    Thanks Rich,I wish I could wedge the Buf III into one of these cases.

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