My SMPS is indeed a bit noisy, but not horribly bad. I've seen far, far worse! I'm not so sure that I'd like using my switcher for radio operations, or RF sensitive circuits, however. For general electronic gadgets and tinkering... it seems to work quite well and fulfil my basic needs. Perhaps I'm just looking for a good excuse to purchase, or 'build' a good linear power supply. Clean is clean, quiet is quiet and anything else is simply less clean and less quiet! Does it really, truly matter, with laser drivers and laser diodes? Hmm, not sure, however. "It can't hurt!" Before I go shopping for a retail linear system... you wouldn't happen to have a schematic 'roadmap' for a proven, DIY, laser friendly linear system, would you?