Question by darpo1: what type of resistor do i need for 19 and 15 volt power supply?
I am connecting regular standard bulbs ( for model railroading) that are 12 volts (25-30 M-amps), however my power supply has 15 volts for DC and 19 for AC. Im going to connect them in parrallel using about 6 bulbs into a terminal block. ………..what size resisitor do i need? and should i connect only one resisitor for all 6 bulbs or each circuit should have its own .
Answer by Garth W The easiest way to handle this is to use two silicon diodes rated for at least 1 amp and have a 1.5 volt drop each that will drop your 15 volts to 12 volts. I would full wave rectify the ac output and use 2-3 more diodes to drop the voltage further. I would not use a power resistor to divide the voltage.
Here’s a Train I built back in the mid to late 80’s and only got as far as the engine and tender,the tender holds a car battery and it is powered by a large windshield wiper motor and chain driven and is quiet powerful,,if you get your fingers hung in the drive rods while running you will loose the fingers,,haha,,,,very very heavy made with all steel and the body is a small oxygen tank,,,It probably weighs in at 100 pounds or more as it it almost impossible to lift the engine alone and carry it any distance,,haha,,I did build about 10 feet of straight track and is as far as I got but someday I will finish it,,I hope you enjoy seeing this homemade engine and its truly american made,,,Rick Video Rating: 5 / 5
Question by vijay a: what type of dc motors used in electric trains and why?what are the advantage of dc motors ?
i wish to know more about dc motors and its applications in electric train applications
Answer by mike p DC motors are easyer to contron torque and speed by varying the power to armature and field leads. And in braking conditions, they actually turn into generators putting energy back into the grid.