@Thorsten Loesch Thanks a lot for your suggestion on how to improve the Zen DAC.
Here is my simple Super (capacitor) Charging solution for my Zen DAC V2.
Power Supply: DC 5v 1A (Linear Power Supply). Without load, the output is around 5.46v. There is no variable resistor in the circuit to change the output voltage
Capacitors: 5.5v 0.5F x 20
All the capacitors are connected in parallel between the power supply and the output plug.
I noticed that the output voltage of the capacitor bank is stabilized around 5.25v when it is connected to the Zen DAC (playing music).
As I just built this capacitor bank, I am monitoring the output voltage closely when it is playing music. I saw a few instances that the voltage drops slowly (around 0.01v a second) to around 5.11v and then it goes back up to 5.23v slowly (around 0.01v a second too).
The voltage values I mentioned above are not always the same values, the min voltage could be down to around 4.89v and the max could be up to 5.45v. However the behaviors are similar (i.e. drop slowly and then back up slowly to another voltage value).
Having said that, most of the time the voltage is stabilized to a value between 5.2 to 5.4v.
Just wondering if you may know what happens on my simple setup? Is it something that is expected?
Thanks a lot for your comments. Cheers.
p.s.: It just happened again. It dropped from 5.26 to 4.89v in around 30 seconds and then it went up to 5.15 again (in around 20 seconds) and seems stabilized now. Before that the voltage was stabilized at 5.26v for long time (around 20 minutes).