Modeling the Reading Railroad in the 1950's
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QUOTE: Originally posted by nedthomas 900 watts at 12 volts is 75 amps. Are you planning to weld with this?
QUOTE: Originally posted by nedthomas Make sure your friend really has a 900 watt transformer. It would have to be very large and hard for one man to carry. Most garden lighting transformers are in the 75 to 150 watt range.
QUOTE: Originally posted by rrinker Only 10 pounds? Bet it's a switching power supply then, no way is it a typical iron core transformer. A 12v secondary 50 amp regular wound transformer is going to weigh a LOT more than 10 pounds. For the intended purposes, it's no big deal. But that's probably another good reason to NOT use it for running trains. It's probably poorly regulated, and probably requires a good deal of load to even stay near the inteded voltage - on the order of 10% or so. PC power supplies with too low a load on the 5V line tend to run high ont e 5V output but low on the 12V line. With only 1 output, I'd guess it will run higher then expected with insufficient load. --Randy