qed digit opamp problems

[j baldam]

Hi Taff, I have two opa627s on a browndog adapter so I'll be trying that.

If you can identify the digital supplies. Oscons should suit.
I like Panasonic FC for supply smoothing.

 

[Taff]

Yep, next step for me will be a bigger supply smoothing cap and trying some op amps by replacing the current one with a dip 8 socket!

 

[j baldam]

Hi Digit has arrived and compared to my Chinese dac.
The digit seems a little less realistic and has less ambiance.
It holds it's own fairly well though which bodes well for a little modding.
I think a lot of the difference will be the op-amp.
First job replace the 5532 with a brown dogged pair of 627s.

 

[Taff]

Interested to know how that goes. Op amp and power cap next for me. not seen those adapters before!

 

[Taff]

Well, found 5 mins to swap the op amp for an LME49720 today (my first op amp swap!)

Very pleased.. this thing really sings now! I think a lot of the performance of my beresford is due to these I'd say..

 

[j baldam]

Hi Taff, here is the 627 adapter from ebay, it is in my chinese dac at the moment but this is it in a rotel pre.
http://i1095.photobucket.com/albums/i464/Jbaldam/100_5331.jpg

here
1pcs SOIC Single to DIP8 Dual Opamp Adaptor | eBay

 

[j baldam]

Hi I've swapped the 627s into the Digit and changed the smoothing caps to Panasonic FC.
Quite a diffrerence and it's looking good to carry on modding.

If I whip the 5v reg out, can I replace it with a Flea power supply.
Ray's Audio Page

 

[Taff]

No idea.. a bit beyond me that!

Did you notice a difference with the caps, and what size did you go for?

 

[j baldam]

Hi Taff, kept the same size caps but used Panasonic FC.
Not tested the caps mod yet but there should be a little difference as Panasonic FC's are good for smoothing in my experience although Oscons are good for digital supplies so I may change one.

I've found that a standard design of power supply, transformer, rectifier, caps, is probably best to power the Digit. I'm making two supplies and using this thread for the regulator and cap mods.

 

[whats gan on]

my qed

My digit