Constant-brightness lighting

[Anonymous]

Has anybody found a contstant-brightness headlight circuit (either board or hand-built) that would fit inside N-scale locos? I'm just getting started in that scale, due to job travel, and have not yet committed to/invested in DCC. Any help or ideas would be appreciated.

Thanks!
Don

[bogp40]

There should be enough room for the diodes. If you don't want to build your own, Utah Pacific and Minitronics has a fairly compact board w/ the diodes. Check them out If there's room for a decoder, these should fit.
Bob K.

[nedthomas]

Give this site a look. http://www.pollensoftware.com/railroad/circuit.html

[Anonymous]

Thanks for the reply, Bob. Actually, I would prefer to build my own. Most of the devices I've seen use an IC of some sort, or are potted so you can't see what they consist of. I thought at one time there were some schematics in an electronics project section of Model Railroader, but I can't find them any longer. Anybody have ideas how the circuits are built [?]

Thanks again for your help[:)]

Don

[Anonymous]

The circuit from pollensoftware.com is exactly what I was looking for. Thanks Ned[:D]

[nedthomas]

To Don Frey. Jameco Electronics at www.jameco.com is a good source for the LM334.
Use a 4.7 ohm resistor for 15ma, 6.8 ohm for 10 ma, and 10 ohm for 8 ma. Hope this helps.

[Anonymous]

Originally posted by nedthomas

To Don Frey. Jameco Electronics at www.jameco.com is a good source for the LM334.
Use a 4.7 ohm resistor for 15ma, 6.8 ohm for 10 ma, and 10 ohm for 8 ma. Hope this helps.

Thanks, Ned. I appreciate your help. I'll try Jameco for the parts needed.

Don[:)]

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