How to use model railroad electronic circuits for control and effects.Model railroad electronic circuits are commercially available for any number of control functions from simple plug-in power supplies to more complex DCC and sound systems. The purpose of this section is to give you a sample of some of those circuits and how they are used on our layouts. DCC and sound will not be covered here but will be addressed in a separate unit because of the special nature of the subject. Also included are a few of the most common electronic symbols and terms. A complete list can be easily obtained from the internet by entering the search query “electronic symbols”. 
Sometimes the units of measure for electronic circuits and components are so large or small that multiples or sub-multiples of measurement must be used. 
Examples: 1 KV=1KILOVOLT=1000 volts 5 milliamps=5ma=5/1,000 amps 18 MEGOHMS=18MΩ=18,000,000 ohms 10 microfarads=10mf=10/1,000,000 farads New devices for model railroad electronics are constantly being introduced. When new or up-dated products are available this section will review their operation and provide additional information. Check out the following: Wiring miniature incandescent lamps Block wiring for DC layouts
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