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November 22, 2017, 05:47:53 PM
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Author Topic: LED headlight  (Read 351 times)
richdan

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« 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
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Hunt
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MBB


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« Reply #1 on: October 30, 2017, 03:32:57 PM »

Click Here
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Loco Bill Canelos

Model railroading since 1947


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« Reply #2 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
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Loco Bill,  Roundhouse Foreman
Colorado & Kansas Railway Missouri Western Railway
Semi Official Historian; Bachmann Large Scale
There are no dumb or stupid questions, just questions!
richdan

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« Reply #3 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
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JBSahnd

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« Reply #4 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
« Last Edit: November 06, 2017, 11:59:53 AM by JBSahnd » Logged
Loco Bill Canelos

Model railroading since 1947


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« Reply #5 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
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Loco Bill,  Roundhouse Foreman
Colorado & Kansas Railway Missouri Western Railway
Semi Official Historian; Bachmann Large Scale
There are no dumb or stupid questions, just questions!
richdan

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« Reply #6 on: November 06, 2017, 06:40:27 PM »

JB,
Thanks for your response.  All the help is appreciated.
Richard
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Joe Zullo

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« Reply #7 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.  Wink
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