FiiO K11 disassembly - modding

[Anatolii_A]

Hello ! Just bought K11 dac/headphones amp, here is board photo with some measurements. There are 18 regulators, with 2 independed amps for 4.4mm phones. First of all I don't like polymer caps in analog circuit, and already swiped one op amp to opa1656. Maybe the pictures will be useful for someone to repair

 

[Anatolii_A]

First of all, I think it will be good to make linear power supply. What do you think about it needed to be regulated or not with such amount of regulators onboard ? Maybe powerfull transformer 9V, diode bridge and 4700uF will be enough for it ?

 

[Markw4]

How much money are you willing to spend modding it?

Also, how much better would you expect it to sound after the mods?

 

[Anatolii_A]

Of course this should be an amount not exceeding the cost of the device itself, but I'm don't thinking seriosly about this, it is a hobby so it is not important about money. I expect this can sounds better, amount of better at this time is hard to measure ))
Now I'm thinking about choosing a power supply, have three interesting variants: Base On STUDER 900 Circuit Power Supply, S35-MKII Fully Discrete HIFI Linear Power Supply or board with 4pcs LT3045 in parallel

 

[Markw4]

What's under the heat sink?

 

[Anatolii_A]

Headphone amplifier, two op amps SGM8262, one per channel