Athearn / DCC lighting question

Athearn / DCC lighting question

Post by Joseph Goodric » Mon, 06 Mar 2000 04:00:00



I am remotoring and adding a decoder to an athearn sd40-2. I have found a
problem however I'mnot sure the best wway to add lighting to my locomotive.
If anyone has added lighting using dcc please respond. I am new to dcc and
would like to get the best lighting I can for my locomotive.   Thanks
joe
 
 
 

Athearn / DCC lighting question

Post by Lyle Dowe » Tue, 07 Mar 2000 04:00:00



Quote:

>I am remotoring and adding a decoder to an athearn sd40-2. I have found a
>problem however I'mnot sure the best wway to add lighting to my locomotive.
>If anyone has added lighting using dcc please respond. I am new to dcc and
>would like to get the best lighting I can for my locomotive.   Thanks
>joe

You have several solutions possible. One would be to leave the bulb in place as
originally built, but to use the brass connector at the back as a connection
point for the headlight wire. The brass connector needs to be rebent and
probably cut so that it can't touch the frame or motor clips. This will
'half-wave rectify' the track voltage, giving the bulb about 6 volts average.
It'll be reasonably lit, but could be better.
  A 2nd, and in my opinion a better choice, is to replace the bulbs with 1.5V
bulbs that are mounted in the headlight positions in the shell. You need to use
resistors witht the bulbs since the decoder always puts close to full rail
voltage (about 12-13V) across whatever is connected to the function output. The
resistor value and wattage are determined by the current required by the bulb
or bulbs. Mount the resistor so it can't contact the shell as it will be pretty
warm. By the way, the primary reason that 1.5V bulbs are used in plastic loco
is that they generate far less heat. The heat is displaced to the resistor.

Lyle Dowell

 
 
 

Athearn / DCC lighting question

Post by Ken » Tue, 07 Mar 2000 04:00:00


You should probably join the Digitrax list on www.onelist,com
There is a wealth of info on that list. Choose to have all the messages sent
to your news reader and start learning anything you want to know.

Ken


Quote:

> >I am remotoring and adding a decoder to an athearn sd40-2. I have found a
> >problem however I'mnot sure the best wway to add lighting to my
locomotive.
> >If anyone has added lighting using dcc please respond. I am new to dcc
and
> >would like to get the best lighting I can for my locomotive.   Thanks
> >joe

> You have several solutions possible. One would be to leave the bulb in
place as
> originally built, but to use the brass connector at the back as a
connection
> point for the headlight wire. The brass connector needs to be rebent and
> probably cut so that it can't touch the frame or motor clips. This will
> 'half-wave rectify' the track voltage, giving the bulb about 6 volts
average.
> It'll be reasonably lit, but could be better.
>   A 2nd, and in my opinion a better choice, is to replace the bulbs with
1.5V
> bulbs that are mounted in the headlight positions in the shell. You need
to use
> resistors witht the bulbs since the decoder always puts close to full rail
> voltage (about 12-13V) across whatever is connected to the function
output. The
> resistor value and wattage are determined by the current required by the
bulb
> or bulbs. Mount the resistor so it can't contact the shell as it will be
pretty
> warm. By the way, the primary reason that 1.5V bulbs are used in plastic
loco
> is that they generate far less heat. The heat is displaced to the
resistor.

> Lyle Dowell

 
 
 

Athearn / DCC lighting question

Post by Bob Youn » Tue, 07 Mar 2000 04:00:00


Lyle:

I am restating what has already been said, check the "Files" at "OneList" /
"Digitrax".  There is a wealth of information, including wiring diagrams<
with respect to lighting/lamp installation with DCC/Digitrax.

From:
B. Young (NFR-NMRA-R32589)
HO/DCC (Digitrax) Model Railroad Hobbyist
Clinton, Ontario, Canada

Quote:

> You should probably join the Digitrax list on www.onelist,com
> There is a wealth of info on that list. Choose to have all the messages
sent
> to your news reader and start learning anything you want to know.

> Ken




> > >I am remotoring and adding a decoder to an athearn sd40-2. I have found
a
> > >problem however I'mnot sure the best wway to add lighting to my
> locomotive.
> > >If anyone has added lighting using dcc please respond. I am new to dcc
> and
> > >would like to get the best lighting I can for my locomotive.   Thanks
> > >joe

> > You have several solutions possible. One would be to leave the bulb in
> place as
> > originally built, but to use the brass connector at the back as a
> connection
> > point for the headlight wire. The brass connector needs to be rebent and
> > probably cut so that it can't touch the frame or motor clips. This will
> > 'half-wave rectify' the track voltage, giving the bulb about 6 volts
> average.
> > It'll be reasonably lit, but could be better.
> >   A 2nd, and in my opinion a better choice, is to replace the bulbs with
> 1.5V
> > bulbs that are mounted in the headlight positions in the shell. You need
> to use
> > resistors witht the bulbs since the decoder always puts close to full
rail
> > voltage (about 12-13V) across whatever is connected to the function
> output. The
> > resistor value and wattage are determined by the current required by the
> bulb
> > or bulbs. Mount the resistor so it can't contact the shell as it will be
> pretty
> > warm. By the way, the primary reason that 1.5V bulbs are used in plastic
> loco
> > is that they generate far less heat. The heat is displaced to the
> resistor.

> > Lyle Dowell