Login
or
Register
Subscriber & Member Login
Login, or register today to interact in our online community, comment on articles, receive our newsletter, manage your account online and more!
Login
Register
Home
»
Model Railroader
»
Forums
»
General Discussion (Model Railroader)
»
Cheap train detection for hidden staging. Ya'll critique my plan.
Edit post
Edit your reply below.
Post Body
Enter your post below.
[quote]QUOTE: <i>Originally posted by grande man</i> <br /><br />The thought strikes me that if a separate power supply were used, it could have a low voltage and eliminate the resistor board altogether... <br />[/quote] <br /> <br />NOT! <br /> <br />An LED is a current device, and not a voltage device. An LED won't conduct current until the bias voltage exceeds the minimum, and then it conducts current ike crazy. The resistor is to limit that current flow. <br /> <br />If your power supply was a Thevenin current source set to 20 mA then you'd be in good shape..... <br /> <br />Mark in Utah
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
Subscriber & Member Login
Login, or register today to interact in our online community, comment on articles, receive our newsletter, manage your account online and more!
Login
Register
Users Online
There are no community member online
Search the Community
ADVERTISEMENT
ADVERTISEMENT
ADVERTISEMENT
Model Railroader Newsletter
See all
Sign up for our FREE e-newsletter
and get model railroad news in your inbox!
Sign up