Bachmann Message Board

Discussion Boards => Large => Topic started by: richdan on October 30, 2017, 02:44:40 PM



Title: LED headlight
Post by: richdan on October 30, 2017, 02:44:40 PM
I just received the LED headlight and resistor set for the Annie from Bachmann Parts.   I need instructions on wiring that into the loco...polarity... where the resistor goes, etc.....very electronic/electrical ignorant.  Thanks.    Richdan


Title: Re: LED headlight
Post by: Hunt on October 30, 2017, 03:32:57 PM
 Click Here  (http://www.bachmanntrains.com/home-usa/dwg/dwgs/LS_4-6-0_Metal_Gears.dc_wiring.pdf)


Title: Re: LED headlight
Post by: Loco Bill Canelos on October 31, 2017, 09:35:43 AM
Richdan,

Don't be worried, if wired wrong nothing will blow up! It is a good idea to test things before soldering in the leads.  temporarily connect the leads as shown in the diagram, then set the loco on the track and add power going forward.  If the led lights up make the permanent connection.  If not just reverse the leads.

Go for it.

Bill


Title: Re: LED headlight
Post by: richdan on November 06, 2017, 12:25:01 AM
Bill,
Thank you for your response, but......to which lead of the LED , anode or cathode, does the resistor attach?  Like I said...electronics ignorant.
Richard


Title: Re: LED headlight
Post by: JBSahnd on November 06, 2017, 11:58:12 AM
Connect the resistor to the cathode (short lead) on the LED.

Link: https://en.wikipedia.org/wiki/LED_circuit


Title: Re: LED headlight
Post by: Loco Bill Canelos on November 06, 2017, 06:13:28 PM
JB nailed it.   beofre final soldering do the quick check to make sure it comes on while going forward, and you should be good to go.

Bill


Title: Re: LED headlight
Post by: richdan on November 06, 2017, 06:40:27 PM
JB,
Thanks for your response.  All the help is appreciated.
Richard


Title: Re: LED headlight
Post by: Joe Zullo on November 08, 2017, 09:51:07 PM
The resister can be attached to either the anode (+) or the cathode (-) and it limits the current and keeps the LED from blowing out. I myself always attach the resister to the anode (long  lead) but can verify it works on the short lead too.  ;)