Quote Originally Posted by HighFidelityGuy View Post
On the subject of the 12V Murata reg possibly not getting enough head room; I've swapped the Caiman's reservoir cap for a 35V film version, removed the input diode, removed the resistor behind the 5V reg and set my linear supply's output voltage to 16V with the load attached. So I know that both regs are getting 16V, which is well above their drop-out voltage. Despite all that I still get hiss and whistling. So we can safely rule out the theory of the Murata regs not getting enough voltage.
What voltage are you reading at the 12v regulator (pin in) with the DAC powered up?

Regards

Chris