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As long as the power supply has proper heat sinking, no damage will occur by leaving it on. Some older power supplys didn't have adequate heat sinking. If it gets hot to the touch with no load, then unplug it. Modern electronics with proper heat sinking are actually better off left plugged in. As stated before, the minimal heat generated keeps the circuits dried out. Another advantage is, the start up inrush currents put more stress on the circuits than leaving the circuit on continiuously. Many modern power supplies have special circuits that limit the amount of current that can flow at start up. They bring the circuit up to voltage in steps to eliminate or at least ease the stress at start up. <br />Another reason to leave it on is thermal. The change from cold to hot, and hot to cold, causes stress to the circuits also. Modern solid state circuits virtually have an unlimited life span if not subjected to unusual streses. <br />One thing I would recommend is, since a DCC system is really a simple computer, run everything through a power line conditioner, and battery backup system. They are cheap now days. About $35 for a bottom line UPS. Stops the surges, voltage fluctuations, and dropouts, that tend to do the damage. It's amasing how dirty the typical house current is. Since I started using a UPS for everything I own, I've not had a failure of any equipment. Before, I would occasionally loose stuff. I wouldn't run anything now without one. <br /> I leave everything on unless I am going to be gone for a long period of time.
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