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
»
Layouts and layout building
»
RS Part Number in "DCC Corner" ?
RS Part Number in "DCC Corner" ?
2137 views
2 replies
Order Ascending
Order Descending
Anonymous
Member since
April 2003
305,205 posts
RS Part Number in "DCC Corner" ?
Posted by
Anonymous
on Wednesday, October 1, 2003 2:36 PM
Hello. In the November DCC Corner: Wiring a DCC turntable.
The part number given, 276-085, for the light emitting diode with built-in resistor resolves to the following part at www.radioshack.com
" Green LED with Holder $1.99 Brand: RadioShack Catalog #: 276-085 Model: 276-085
Typical MCD is 22. Typical wavelength is 555nm. Lens size is 6mm. Green lens color. Viewing angle is 45°. 15mA (max). Typical Voltage is 12, with a maximum voltage of 12.9V. Comes as package of 1. Mfg hole diameter is 3/16".
No mention is made of a built-in resistor. IS THIS THE RIGHT PART ? Doesn't DCC put up to 18v on the rails ?
Thanks.
Reply
Edit
Anonymous
Member since
April 2003
305,205 posts
Posted by
Anonymous
on Thursday, October 2, 2003 10:43 AM
Since no one esle has answered, that LED would have a built resistor (or something) as most LEDs max at about 5vdc. Dcc puts about 12 volts into the rails as usable power. The voltage may appear higher than that with a VOM, but that's due to the pulse and bipolar nature of the signal on the track. As to it being "the right" part only the author could answer that for sure, but it appears to me that it most likely is. FRED
Reply
Edit
dpopp
Member since
January 2002
12 posts
Posted by
dpopp
on Friday, October 3, 2003 10:16 AM
Hello and thanks for the question.
After talking with Mike Polsgrove, the columnist, he said he simply stopped in to his local Radio Shack looking for an LED and found that one with a built -in resistor. The part number (276-085) is straight from the package.
As for DCC track voltage, that has been a greatly debated issue as of late. The default voltage for HO scale should be 12-14 volts, but that the value depends upon the system and its booster power supply. If you are using a system with an 18 volt supply, you will want a different resistor for your LED.
I hope that helps and best wishes on your DCC endeavors.
Sincerely
David Popp Associate Editor Model Railroader Magazine
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