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Another Cmoy Project

post #1 of 16
5/6/11 at 12:50am
Thread Starter 

CmoyV2Shema.JPG

CmoyV2CI.JPG

CmoyV2Impl.JPG

 

 

 

CmoyV2.JPG

 

CmoyV2CI.JPG

 

 

The AOP are single AOP .

 

Next step : solder the AOP !!!!!!

 

Serge

 

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post #2 of 16
5/6/11 at 10:59am
Thread Starter 

More pictures:

LG CD drive ,
Shunt Reg. by SALAS from the Hypnotize for the "CMOY"
The CMOY is connected to the analog ouput of the CD drive
The AOPs are OP 1611

Last picture a CMOY version with a double AOP LT1364 ( Good !!!!)

CMOY1.jpg

CMOY2.jpg

CMOY3.jpg

CMOY5.jpg

CMOY6.jpg

 

Serge

 

 

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post #3 of 16
5/6/11 at 11:25am

It looks like you have done a good job and enjoy what you have built.

One thing though...you should find a new name for it because it

in not a Cmoy.

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post #4 of 16
5/7/11 at 4:26am
Thread Starter 

I have removed the OP 1611 and replaced it with two LTC 1028 .

I have removed the bad C=0.1µf .Now there is no C input .

I have replaced the R=1.5k by a 10.5 K

 

Much better !!!!

 

 

I have another CI and i would like find another very good single AOP ...have you an idea ?

 

 

 

Serge

 

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post #5 of 16
5/8/11 at 9:02pm
Thread Starter 

The LTC 1364 has more dynamic ,more bass ,more details !!!!!!basshead.gif

 

I have good CD records for testing your systemo2smile.gif and

i am very surprised by the good quality of the LG drive  analog output .happy_face1.gifL3000.gif

 

 

If you have ideas about a single AOP so good than the LTC 1364 give me your choice

 

 

Serge

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post #6 of 16
5/10/11 at 11:35am
Thread Starter 

Today i am "disapointed" ....frown.gif

with the LTC 1028 there is less dynamic but in French in the text !!!!!

le  son est plus  aérien , moins crispé ,les voix semblent moins en avant  ,moins fatiguant à l'ecoute ( si quelqu'un peut faire la trad en English)

 

Serge

 

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post #7 of 16
5/11/11 at 8:08pm

i assume you mean lt1028, otherwise you have picked the wrong linear tech chip. i mean i know its personal choice and the opa1611 is actually a surprisingly good chip, but its nothing on lt1028 in the proper layout, which is likely your problem, what gain have you set? lt1028 isnt really that keen on low gain, though lt1128 is fine with unity. there are a few tricks to get it sounding its best. try lme49990, opa827, opa1641 

 

lol cmoy with shunt reg haha, a pocket sized amp to keep you warm on those winter jaunts


Edited by qusp - 5/11/11 at 8:13pm
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post #8 of 16
5/12/11 at 12:17pm
Thread Starter 

deadhorse.gif

 

Yes LT not LTC .....

 

what gain have you set ? ( 1+11.5/10.5 k ) ~ 2

Today I have  received two samples from TI :THS3121 SO-8k701smile.gifbeerchug.gif

The best for the moment wink.gif.... for my configuration ....

Next step :
a CI for two LME49600 with a double AOP ( DIP8 ) or two single AOP ( SO-8)

Serge


Edited by Sergelisses - 5/12/11 at 12:22pm
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post #9 of 16
5/13/11 at 6:04am
Thread Starter 
I need advices about the shema attached with LME49600

Do you think that the shema is correct ?

Thanks

Serge
 
ShemaMiniHeadPhone.JPG
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post #10 of 16
5/13/11 at 11:16am
Thread Starter 

LT 1028:

 

There is always a souffle in the headphone and a little noise at the beginning of the potentiometer .

The gain is around 2 perhaps is not enough !!!!!

 

lt1028 isnt really that keen on low gain dixit QUSP in a last post

 

What is the best solution ,increase the gain or a capa at the input ?

 

Thanks

 

Serge

 


Edited by Sergelisses - 5/14/11 at 12:52am
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post #11 of 16
5/14/11 at 9:04am
Thread Starter 

With the gain to 5 is better .

 

Now i prefer the LT 1028 .gs1000.gif

 

I have made some tests with two 9v batteries and two 4700µ 25v FC Panasonic .

I am surprised Instruments tonality have changed L3000.gif

 

Have you suggestions about the power supply ?

 

Thanks

Serge

 

 

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post #12 of 16
5/26/11 at 1:49am
Thread Starter 

 

I did some tests with LM317 and LM337 regulators .
One LM317 and one LM337 for each AOP .( Two single AOP ).

 confused_face.gifbasshead.gif

The results are :Where are the bass and the dynamic ?
I have no more fun listening to my CD

Probably:errors implentation ,bad capacitors choice .......
If you have any advices for improvement

For the moment the Shunt Reg. by SALAS  is better .
This weekend some tests with OPA827 and OP1641

Serge

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post #13 of 16
5/26/11 at 12:13pm
Thread Starter 

B]This weekend some tests with OPA827 and OP1641[/B]wink_face.gif
No the tests are Today !!!
And the winner is ....... OPA827L3000.gif

For the moment the best AOP are LT1028 and OPA 827  always with the Shunt Reg. by SALAS

The best AOP for this application and for me atsmile.gif

Serge

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post #14 of 16
5/27/11 at 9:50pm
Quote:
Originally Posted by Sergelisses View Post

LT 1028:

 

There is always a souffle in the headphone and a little noise at the beginning of the potentiometer .

The gain is around 2 perhaps is not enough !!!!!

 

lt1028 isnt really that keen on low gain dixit QUSP in a last post

 

What is the best solution ,increase the gain or a capa at the input ?

 

Thanks

 

Serge

 



sorry didnt see your reply, yes minimum 5x gain, but if you have very low Z headphones this might cause hiss of its own. a cap on the input wont do anything to stop hiss. are you compensating the opamp?

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post #15 of 16
5/28/11 at 1:29am
Thread Starter 

Thanks for your advices .

 

are you compensating the opamp?

Sorry i don't understand what do you mean .

Serge

 

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