Edit post

Edit your reply below.

Post Body
Enter your post below.
The secret to the "bulb" trick to protect districts from shorts is that a tungsten filament bulb has about a 13/1 hot to cold resistance. Therefore the bulb acts like a short circuit when cold (no short) and as a current control device with a short and when the short is bad enough, the bulb will light limiting current to the bad section.
Tags (Optional)
Tags are keywords that get attached to your post. They are used to categorize your submission and make it easier to search for. To add tags to your post type a tag into the box below and click the "Add Tag" button.
Add Tag

Update Reply

Login, or register today to interact in our online community, comment on articles, receive our newsletter, manage your account online and more!

Model Railroader Newsletter See all

Sign up for our FREE e-newsletter and get model railroad news in your inbox!