Did some easy DAC mods

[WuNgUn]

A pair of dual Burson opamps, added Multicap capacitors to the opamp rails and a DEXA 5V regulator in place of a 7805.

I have another, smaller pair of Cardas caps I'd like to test on the pair of mono opamps, but I don't know the power pinout....? 

[davide256]

hmm, multicaps. Ok for a digital section but not for analog amplification. You might find the link below interesting reading. I'm a fan of Clarity cap as a good

overall line for analog circuits.

 

http://www.laventure.net/tourist/caps.htm

[WuNgUn]

21 minutes ago, davide256 said:

hmm, multicaps. Ok for a digital section but not for analog amplification. You might find the link below interesting reading. I'm a fan of Clarity cap as a good

overall line for analog circuits.

 

http://www.laventure.net/tourist/caps.htm

Why not analog? 

That's an interesting article... Very subjective but interesting... 

Also an interesting read... 

http://www.partsconnexion.com/PDF/mcap.pdf

[kilroy]

What changes does each of these mods make to the sound? 

 

I'm not an electronics guy, I suppose the voltage regulator requires soldering? And the opamps just plug in?

[WuNgUn]

29 minutes ago, kilroy said:

What changes does each of these mods make to the sound? 

 

I'm not an electronics guy, I suppose the voltage regulator requires soldering? And the opamps just plug in?

Capping opamps is a popular mod... 

Different caps and different values will change certain aspects of the sound. I find these caps make the stage a little more detailed and maybe a tad wider... 

The reg needed soldering, yes. Easy, 3 leg TO package 7805 regulator,  a bread and butter 5VDC unit. The DEXA regulators are pretty inexpensive as well. Power mods like this just help with a cleaner or crisper sounding product generally... 

The opamps just plug in, yes... A DIP8 socket. Opamps come in many different flavours... Most are DIP8 chips, while the Burson's are discrete. Much better sound than the old JRC5532's that came with the DAC. 

[WuNgUn]

Tomorrow I'm swapping out the 25MHz crystal out of my main board and using it in my powered, LJC instead, powered off my SSR03 PSU. Pics coming... 

[davide256]

Been there, done that with  DACs for discrete op amps and cap . The discrete component Burson replacements are a no brainer for better signal resolution when replacing OP amps.  The Multicaps however are shrill, unpleasant. I went with them first on an Adcom DAC, couldn't stand them, replaced with Audiocap Thetas.

[WuNgUn]

LJC on the main board, powered off the SSR03... 

This clock apparently is just for the network adapter. I dunno where or if the SPDIF on board uses a different crystal...? 

Didn't see any others soldered anywhere. 

[Panelhead]

On 1/6/2018 at 3:05 PM, WuNgUn said:

A pair of dual Burson opamps, added Multicap capacitors to the opamp rails and a DEXA 5V regulator in place of a 7805.

I have another, smaller pair of Cardas caps I'd like to test on the pair of mono opamps, but I don't know the power pinout....? 

  The replacement caps need better layout. A small stacked film cap will offer better bandwidth. Plus the leads are 10x longer than optimal. 

  I like a Siemens stacked film soldered directly to the pins of the opamp. The leads are about 1/8” long. 

[WuNgUn]

13 hours ago, Panelhead said:

  The replacement caps need better layout. A small stacked film cap will offer better bandwidth. Plus the leads are 10x longer than optimal. 

  I like a Siemens stacked film soldered directly to the pins of the opamp. The leads are about 1/8” long. 

Those are stacked caps.... Internally. 

I agree about the lead length as well... Not optimal.