Dear Bob, We sell replacment "Golden White" LEDs for our switchers. It includes three LEDs (one for the cab light) and the pcb that includes all of the dropping resistors. If you use this with our DCC 12 socket pcb with our new switcher 12 pin DCC interface sound board, you can plug in a gold Lenz decoder and Soundtrax DSX sound unit. The socket includes a wireharness for speaker, front/rear/cab LEDs and light commons. Best regards, Don
Robert Nicholson wrote: > So, are we talking about constant lighting, or will the bulb brighten > and dim with changing throttle positions. > > I bought a constant lighting system once, but it didn't last long. I > must have done something wrong. > > Also, will LED's work in lieu of the light bulbs > > Bob Nicholson > > --- In [email protected] <mailto:S-Scale%40yahoogroups.com>, > Bill Roberts <[EMAIL PROTECTED]> wrote: > > > > > > > Posted by: "hjsheff" [EMAIL PROTECTED] hjsheff > > > Date: Wed Jan 2, 2008 3:44 pm ((PST)) > > > > > > I am on the road to help the NASG with the Sacramento Worlds > > > Greatest Hobby show and I > > > ran into a problem trying to buy resistors. I stopped by the local > > > train shop and bought some > > > 1.5 volt 30mA 1.2mm dia. incandescent bulbs but they didn't have > > > any resistors for them. > > > The local electronic supply house couldn't tell me what resistors to > > > use to reduce the 14 volt > > > supply to the 1.5 volt bulb. This is for a PBL Heisler I am > > > painting and converting to dcc. > > > > > > I would appreciate any help that someone may give to know what > > > resistor to purchase or > > > where I can find a chart to find out. The store guys got into Ohms, > > > wattage needed and other > > > techno speak that I couldn't relate to. They sold me a 1/4 > > > watt1.2Kohm 2% that didn't work. > > > > > > To solve your question manually you need two equations from high school: > > > > [1] ohms = volts / amps > > > > [2] watts = volts * amps > > > > Using [1], if the supply is 14 volts and you need just 1.5 to light > > your .030 amp bulb, then you need to drop 12.5 volts: > > > > (14 - 1.5) / .030 > > > > This works out to about 417 ohms. As Andy Malette said, a 470 ohm > > resistor is close. It is readily available from Radio Shack. > > > > The other piece of information you need to calculate before buying > > your resistor is its wattage. Starting with [1] again, solving for > > amps gets you volts / ohms, and substituting this in [2] gives: > > > > watts = volts * volts / ohms > > > > Thus, power dissipation in watts is equal to the square of the voltage > > dropped, 12.5, divided by the resistance, 470: > > > > 12.5 * 12.5 / 470 > > > > This is about 0.33. Your store choices are 1/4 watt or 1/2 watt. I > > would round up the 0.33 and choose a 470 ohm, 1/2 watt resistor. And, > > as Michael Eldridge writes, you can try different resistances to get > > the brightness you like, except that you already know 1,200 ohms is so > > great that the bulb doesn't glow at all. > > > > The 2% value of the resistor you bought refers to its tolerance. All > > my Radio Shack resistors are 5%, and they work just fine. > > > > -- > > Bill Roberts > > > > [Non-text portions of this message have been removed] Yahoo! Groups Links <*> To visit your group on the web, go to: http://groups.yahoo.com/group/S-Scale/ <*> Your email settings: Individual Email | Traditional <*> To change settings online go to: http://groups.yahoo.com/group/S-Scale/join (Yahoo! ID required) <*> To change settings via email: mailto:[EMAIL PROTECTED] mailto:[EMAIL PROTECTED] <*> To unsubscribe from this group, send an email to: [EMAIL PROTECTED] <*> Your use of Yahoo! Groups is subject to: http://docs.yahoo.com/info/terms/
