Quote Originally Posted by Gazjam View Post
Regarding the Murata background noise, best theory I've heard came from Jimmy Dripps of Tirna (and I no doubt misquote), who thought it was a case of both regulators operating at a frequency too close to each other (just bad luck) and this caused an audible "beat" which manifested itself as the noise.
Hi Gazjam, I'v tried two different pairs of muratas, one pair from Tirna and later one pair directly from US (tried to resolve the whistle), but both pairs had the same issue so it would be quite surprising if in both cases I'd hit some specific frequency. I'll probably try to combine those pairs in between them before buying Dexas if my PCB would allow me to experiment further because I also Melted junctions of PCB for 5v reg already :/
btw I had to replace ribbon wire too, seems to Br quite common issue when modding too much

Tomas