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· Rich Dumas
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4,546 Posts
These power supplies are cheaper than you would ordinarily see because they are switching, rather than linear power supplies.. The rated ripple voltage, which is the unwanted AC component of the output is a little high. An extra capacitor across the output should remove most of that. If you have to crank your track voltage way up you need to take some measurements to find out what is really going on. If you were to put a car on the track with something under the back of the car to get the wheels off the track you could punch the controller and measure the voltage at the track rails. An open circuit voltage won't tell you anything except that some sort of power is getting to the track.
 

· Rich Dumas
Joined
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4,546 Posts
The rated ripple for my power supplies is 1mV. I suspect that is less than you would normally see. 50mV might not be enough ripple to cause any problems, but the price of a 4700 MFD capacitor is cheap insurance.
 
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