D1 opamp.. share ur findings...

[WatCult 0]

Actually i have 2 of the 3 opamps you are waiting for except for the LT1364.

 

Planning to use the L/R: AD797 Buffer: LMH6655 DAC: LTC6241

[PPkiller 0]

roger.. let me know 797 or 627 sounds better... can help me confirm whether 627 benefits from power adaptor? to me it sounds better...

[PPkiller 0]

i measure the voltage with and without power adaptor... 7+ volt with battery and 10v with power adaptor for L/R and buffers..

[PPkiller 0]

i just tried opa627 with by pass buffer.. opa627 can't do it without buffers.. sound stage collapsed(bo 3d sound).. bass 'woof' bo too... 8066 back in and everything sounds wonderful again.. :-)

[PPkiller 0]

waltcult have you tried the ad797? i'm keen on a mini meet up.. but i can't find a good place for it...

 

here's a list of pple who are keen to have a meet up

1. mini

2. watcult

3. PPkiller

 

 

anyone is able to provide a place for the meet up?

[WatCult 0]

Just soldered my a few opamp on adaptors Ad797, LMH6655, LTC6241.

 

Previously, was using the AD825 -L/R, LME49720-Buf, LT6234 -DAC.

 

Didn't really have the time to A/B the opamp. But i first tried swapping the LMH6655 into the Buf, louder and clearer sound compared to the LME49720.

 

Next swap in the AD797 .. Much better separation, soundstage expanded and it feels like the singer is singing much closer to you.

 

Next LTC6241 - unfortunately i think i didn't solder properly ... the sound coming from the right side of my earphone was soft compare to the left. Have to resolder a new LTC6241.

 

After i decided to try the LME49720 on the DAC .... It was terrible, i felt the sound is abit compressed and muffled. Not sure whether i was affected by the LTC6241...

 

Will do my test later on ... when i have to time ... will try to solder the OPA627, AD8066, AD8397 and the LTC6241 again.

 

I think we can use one of the rooms in NUS Bukit Timah Campus, plus the fact that i have lessons there on sat ...

[PPkiller 0]

good idea.. which sat will be good? lecture will start next week... tutorial 2 weeks later..

 

i'm from nus too..

[WatCult 0]

I am attending a part time course @ the law faculty so i will be at BTC every sat morning. So just choose any sat afternoon i am fine with that.

 

How about mini? any suitable date for you?

[mimi 0]

I'm ok with this Sat. Would prefer venue to be more central, but BTC is ok.

 

Opamps that I can bring: LMH6643s, AD8397s, AD743s, AD8656, ADA4841-2, LME49720s

Edited January 7, 2008 by mimi

[PPkiller 0]

watcult.. wat time does your course end?

[WatCult 0]

Ends at 12:30pm. We can meet after that.

 

btw is it possible to help me solder a pair of bypass buffer for the AD797 cos i don't have any DIP8 socket.

 

Thanks.

[PPkiller 0]

i have a pair of bypass buffer. i will pass you this sat.

 

wat public bus number is avaliable at btc?(i haven't step into btc campus before.. at least not yet.. :-p)

 

should we meet at about 1?

 

here's a map of the btc campus.. http://www.nus.edu.sg/campusmap/btc.htm

 

how about meet at the yellow bus stop icon in the map there?

[WatCult 0]

Public bus ... if you are taking from newton ... 48, 66, 67, 170, 171.

 

Sure no prob. I can meet you guys there at 1pm.

 

btw anyone gonna bring their laptop? or source?

Edited January 9, 2008 by WatCult

[PPkiller 0]

i'll be bringing my laptop..

[WatCult 0]

Thanks for meeting up yesterday.

 

It was fun ... rolling all those opamp.

 

I think the LTC6241 for the DAC was the clear winner.

 

But for L/R it will really depend on what kind of sound signature you guys are looking for.

 

OPA627 - Dynamic, bassy and Upfront

AD746 - Dynamic, less upfront compared to the OPA627 and wide soundstage, not to mention nice replication of a live classical music environment.

AD797 - Upfront, balanced and musical

 

What are the opinion from you guys?