Date   

Re: One reversing loop to support reversing in both directions off the mainline?

wyantj01@...
 

Having back to back Y turnouts is what I think I am proposing... but I realized after updating my sketch it will not work because the X in the center is not long enough for a train.

I will post my sketch but have yet to figure out where to post photos or files and groupsIO help is not much help and the group's website doesn't identify the a site for files.  I have requested help from the moderator.


Re: One reversing loop to support reversing in both directions off the mainline?

Blair
 

The simplest way to connect such that both directions have a reversing loop is the old 'figure 8 with sidebars', with either back-to-back Y turnouts, or a crossing, in the center.  The entire 'X' in the center would need to be powered through an autoreverser.

Don't recall if we can have attachments, so I've attached a sketch and will post to files if it doesn't appear.

Blair


Re: Updated album Car lighting keep alive cap #photo-notice

Paul R Greenwald
 

George -

How about a putting schematic in photos or files? 


Re: One reversing loop to support reversing in both directions off the mainline?

Don Vollrath
 

Jeremy, it’s difficult to see without a sketch or drawing . From your description I would expect it to require something resembling a wye to re-enter the turn-around loop from the opposite direction. Nothing wrong as long as the AR section is long enough to hold the entire train before reaching the exit.

DonV


Re: Updated album Car lighting keep alive cap #photo-notice

Don Weigt
 

The values George gave will work fine.
The bridge rectifier is about as low a rating as you can get, so it will be small and inexpensive.
The 270 Ohm resistor will limit the inrush current to about 0.06 Amperes, so many lighted cars in a train will work without overloading most boosters. The peak inrush current and voltage across the 270 Ohm resistor momentarily creates a 1 Watt power level, but it will drop off quickly to about 1/100th Watt, so a 1/4 Watt resistor, which is much smaller, can be used in place of the 1/2W.
Same for the 4.7k Ohm resistor. If the cap reaches 16 V DC, which is highly unlikely, the current will still be less than 4 milliAmps (0.004 Amperes) That gives a steady state power level less than 0.064 Watts. A quarter Watt resistor would be fine here, too.

The 470 uF capacitor will indeed keep the lights on for a long time used with that 4.7k resistor. The time constant (time to drop to 37% of the initial voltage)  of the resistor and capacitor is about 2.2 seconds, and many of these capacitors have a higher capacitance than their nominal value, tolerances being something like +50% or +100% and -20%. Given the working voltage for HO and smaller gauges should be less than 16V, a 25V capacitor of about half the size could be used in place of the 35V one. The 35V part will have a longer life, all else being equal, but both will probably last for the lifetime of the cars.



--
Don Weigt
Connecticut


Re: One reversing loop to support reversing in both directions off the mainline?

Allan AE2V
 

Jeremy,

I think you are describing an oval with a diagonal reversing track.  Go to my website and scroll down for a picture of this.

https://wiringfordcc.com/track_2.htm#reversing

If this is what you have in mind, it works.  No wiring challenges.

I just need to give you a heads up.  When the train is travelling counter clockwise, you can enter the reversing section going forward and travel to the other side.  But once you have done this and are traveling clockwise, you won't be able to enter the reversing section going forward.  You will need to back through the reversing section to get it turned around and traveling counter clockwise again.

Allan Gartner
Wiring for DCC


One reversing loop to support reversing in both directions off the mainline?

wyantj01@...
 

I am building a relatively simple O scale layout where I have a reversing loop within a circular mainline.  It currently reverses trains in one direction using a PSX-AR in the reversing section.  Ideally I would have a second reversing loop for the other direction but I do not have space.  It occurred to me that I might be able to use the existing  reversing loop by connecting from other mainline direction into the reversing loop entry point.  Is there anything I am missing re: using a loop for both directions?

BTW I would post a sketch but I do not have the photo icon in the editor...  maybe because I am new member moderated in this group.

Thanks for any thoughts here.
Jeremy


Re: There are two of these

Blair
 

Greg

list strips attachments and embeds.


On 3/12/2022 12:27 PM, Greg Harter wrote:
Does anybody know what these are?  I can't tell.  I think they are, or have, a DCC application, but not sure.

Greg Harter

---------- Forwarded message ---------
From: Greg Harter <greg1462@...>
Date: Sat, Mar 12, 2022 at 11:47 AM
Subject:
To: <greg1462@...>










There are two of these

Greg Harter
 

Does anybody know what these are?  I can't tell.  I think they are, or have, a DCC application, but not sure.

Greg Harter

---------- Forwarded message ---------
From: Greg Harter <greg1462@...>
Date: Sat, Mar 12, 2022 at 11:47 AM
Subject:
To: <greg1462@...>










Re: Updated album Car lighting keep alive cap #photo-notice

 

Thanks George,
Can I get a copy of the details.
- Michael Boyle
boyle10017@...


Re: Updated album Car lighting keep alive cap #photo-notice

Pete
 

George,
Looks like you have a = sign in the email address instead of an @ sign..
Kayakerpc@... 
Thanks,
Pete


On Thu, Mar 10, 2022 at 9:04 AM, george hohon3
<Hohon3@...> wrote:
Pete, I tried the email address from your post and it failed to go through.  Do you have another one?

From: w4dccqa@groups.io <w4dccqa@groups.io> on behalf of Pete via groups.io <Kayakerpc@...>
Sent: Thursday, March 10, 2022 7:02 AM
To: w4dccqa@groups.io <w4dccqa@groups.io>
Subject: Re: [w4dccqa] Updated album Car lighting keep alive cap #photo-notice
 
George,
I would like to have the schematic too.
Thanks,
Pete


On Thu, Mar 10, 2022 at 4:42 AM, Robert Heroux
<rheroux@...> wrote:
George -

I would be interested in the details etc.

Thanks

Bob







On Mar 9, 2022, at 20:58, george hohon3 <Hohon3@...> wrote:

Here's my solution for passenger car and caboose lighting on an HO scale DCC layout:
  • 1A 50V Bridge Rectifier
  • 270 Ohm 1/2 watt Resistor (for in-rush current protection)
  • 470 /35 W Capacitor  (just a bit larger than track power)
  • 4.7K Ohm 1/2 watt Resistor  (brightness control for LED lights)
  • LED light strip (3 LEDs minimum)
There are no apparent "in-rush" current problems.

Brightness might be too bright, requiring a higher rated resistor (dependent on strip LED).

Flicker free operation is perfect, as in, there is no flicker!

If you're interested in the details, photos and the wiring schematic, let me know.

George 



From: w4dccqa@groups.io <w4dccqa@groups.io> on behalf of w4dccqa@groups.io Notification <noreply@groups.io>
Sent: Sunday, March 6, 2022 7:23 AM
To: w4dccqa@groups.io <w4dccqa@groups.io>
Subject: [w4dccqa] Updated album Car lighting keep alive cap #photo-notice
 
Don Weigt <dweigt47@...> updated the album Car lighting keep alive cap: Greg Harter's passenger car lighting board with added capacitor. Greg reports lighting is constant for more than five seconds after power is removed from the rails. One photo is of the car with DCC power on the rails, the other after about five seconds without power. Can you tell which is which? The lighting board is from Walthers. The wires to the capacitor can be thin, as typically used wiring decoders. lt is possible long passenger trains with multiple cars would cause a problem by briefly drawing too much current when power is applied. If that happened, one fix would be to put a ten to about twenty Ohm resistor in either capacitor lead. This would reduce "keep alive" time a bit, as well as add complexity. The total modification cost per car would still be under half a dollar if the parts were bought from most online sources.



Re: Updated album Car lighting keep alive cap #photo-notice

george hohon3
 

Pete, I tried the email address from your post and it failed to go through.  Do you have another one?


From: w4dccqa@groups.io <w4dccqa@groups.io> on behalf of Pete via groups.io <Kayakerpc@...>
Sent: Thursday, March 10, 2022 7:02 AM
To: w4dccqa@groups.io <w4dccqa@groups.io>
Subject: Re: [w4dccqa] Updated album Car lighting keep alive cap #photo-notice
 
George,
I would like to have the schematic too.
Thanks,
Pete


On Thu, Mar 10, 2022 at 4:42 AM, Robert Heroux
<rheroux@...> wrote:
George -

I would be interested in the details etc.

Thanks

Bob







On Mar 9, 2022, at 20:58, george hohon3 <Hohon3@...> wrote:

Here's my solution for passenger car and caboose lighting on an HO scale DCC layout:
  • 1A 50V Bridge Rectifier
  • 270 Ohm 1/2 watt Resistor (for in-rush current protection)
  • 470 /35 W Capacitor  (just a bit larger than track power)
  • 4.7K Ohm 1/2 watt Resistor  (brightness control for LED lights)
  • LED light strip (3 LEDs minimum)
There are no apparent "in-rush" current problems.

Brightness might be too bright, requiring a higher rated resistor (dependent on strip LED).

Flicker free operation is perfect, as in, there is no flicker!

If you're interested in the details, photos and the wiring schematic, let me know.

George 



From: w4dccqa@groups.io <w4dccqa@groups.io> on behalf of w4dccqa@groups.io Notification <noreply@groups.io>
Sent: Sunday, March 6, 2022 7:23 AM
To: w4dccqa@groups.io <w4dccqa@groups.io>
Subject: [w4dccqa] Updated album Car lighting keep alive cap #photo-notice
 
Don Weigt <dweigt47@...> updated the album Car lighting keep alive cap: Greg Harter's passenger car lighting board with added capacitor. Greg reports lighting is constant for more than five seconds after power is removed from the rails. One photo is of the car with DCC power on the rails, the other after about five seconds without power. Can you tell which is which? The lighting board is from Walthers. The wires to the capacitor can be thin, as typically used wiring decoders. lt is possible long passenger trains with multiple cars would cause a problem by briefly drawing too much current when power is applied. If that happened, one fix would be to put a ten to about twenty Ohm resistor in either capacitor lead. This would reduce "keep alive" time a bit, as well as add complexity. The total modification cost per car would still be under half a dollar if the parts were bought from most online sources.



Re: Updated album Car lighting keep alive cap #photo-notice

Pete
 

George,
I would like to have the schematic too.
Thanks,
Pete


On Thu, Mar 10, 2022 at 4:42 AM, Robert Heroux
<rheroux@...> wrote:
George -

I would be interested in the details etc.

Thanks

Bob







On Mar 9, 2022, at 20:58, george hohon3 <Hohon3@...> wrote:

Here's my solution for passenger car and caboose lighting on an HO scale DCC layout:
  • 1A 50V Bridge Rectifier
  • 270 Ohm 1/2 watt Resistor (for in-rush current protection)
  • 470 /35 W Capacitor  (just a bit larger than track power)
  • 4.7K Ohm 1/2 watt Resistor  (brightness control for LED lights)
  • LED light strip (3 LEDs minimum)
There are no apparent "in-rush" current problems.

Brightness might be too bright, requiring a higher rated resistor (dependent on strip LED).

Flicker free operation is perfect, as in, there is no flicker!

If you're interested in the details, photos and the wiring schematic, let me know.

George 



From: w4dccqa@groups.io <w4dccqa@groups.io> on behalf of w4dccqa@groups.io Notification <noreply@groups.io>
Sent: Sunday, March 6, 2022 7:23 AM
To: w4dccqa@groups.io <w4dccqa@groups.io>
Subject: [w4dccqa] Updated album Car lighting keep alive cap #photo-notice
 
Don Weigt <dweigt47@...> updated the album Car lighting keep alive cap: Greg Harter's passenger car lighting board with added capacitor. Greg reports lighting is constant for more than five seconds after power is removed from the rails. One photo is of the car with DCC power on the rails, the other after about five seconds without power. Can you tell which is which? The lighting board is from Walthers. The wires to the capacitor can be thin, as typically used wiring decoders. lt is possible long passenger trains with multiple cars would cause a problem by briefly drawing too much current when power is applied. If that happened, one fix would be to put a ten to about twenty Ohm resistor in either capacitor lead. This would reduce "keep alive" time a bit, as well as add complexity. The total modification cost per car would still be under half a dollar if the parts were bought from most online sources.



Re: Updated album Car lighting keep alive cap #photo-notice

Robert Heroux
 

George -

I would be interested in the details etc.

Thanks

Bob







On Mar 9, 2022, at 20:58, george hohon3 <Hohon3@...> wrote:

Here's my solution for passenger car and caboose lighting on an HO scale DCC layout:
  • 1A 50V Bridge Rectifier
  • 270 Ohm 1/2 watt Resistor (for in-rush current protection)
  • 470 /35 W Capacitor  (just a bit larger than track power)
  • 4.7K Ohm 1/2 watt Resistor  (brightness control for LED lights)
  • LED light strip (3 LEDs minimum)
There are no apparent "in-rush" current problems.

Brightness might be too bright, requiring a higher rated resistor (dependent on strip LED).

Flicker free operation is perfect, as in, there is no flicker!

If you're interested in the details, photos and the wiring schematic, let me know.

George 



From: w4dccqa@groups.io <w4dccqa@groups.io> on behalf of w4dccqa@groups.io Notification <noreply@groups.io>
Sent: Sunday, March 6, 2022 7:23 AM
To: w4dccqa@groups.io <w4dccqa@groups.io>
Subject: [w4dccqa] Updated album Car lighting keep alive cap #photo-notice
 
Don Weigt <dweigt47@...> updated the album Car lighting keep alive cap: Greg Harter's passenger car lighting board with added capacitor. Greg reports lighting is constant for more than five seconds after power is removed from the rails. One photo is of the car with DCC power on the rails, the other after about five seconds without power. Can you tell which is which? The lighting board is from Walthers. The wires to the capacitor can be thin, as typically used wiring decoders. lt is possible long passenger trains with multiple cars would cause a problem by briefly drawing too much current when power is applied. If that happened, one fix would be to put a ten to about twenty Ohm resistor in either capacitor lead. This would reduce "keep alive" time a bit, as well as add complexity. The total modification cost per car would still be under half a dollar if the parts were bought from most online sources.



Re: Updated album Car lighting keep alive cap #photo-notice

george hohon3
 

Here's my solution for passenger car and caboose lighting on an HO scale DCC layout:
  • 1A 50V Bridge Rectifier
  • 270 Ohm 1/2 watt Resistor (for in-rush current protection)
  • 470 /35 W Capacitor  (just a bit larger than track power)
  • 4.7K Ohm 1/2 watt Resistor  (brightness control for LED lights)
  • LED light strip (3 LEDs minimum)
There are no apparent "in-rush" current problems.

Brightness might be too bright, requiring a higher rated resistor (dependent on strip LED).

Flicker free operation is perfect, as in, there is no flicker!

If you're interested in the details, photos and the wiring schematic, let me know.

George



From: w4dccqa@groups.io <w4dccqa@groups.io> on behalf of w4dccqa@groups.io Notification <noreply@groups.io>
Sent: Sunday, March 6, 2022 7:23 AM
To: w4dccqa@groups.io <w4dccqa@groups.io>
Subject: [w4dccqa] Updated album Car lighting keep alive cap #photo-notice
 

Don Weigt <dweigt47@...> updated the album Car lighting keep alive cap: Greg Harter's passenger car lighting board with added capacitor. Greg reports lighting is constant for more than five seconds after power is removed from the rails. One photo is of the car with DCC power on the rails, the other after about five seconds without power. Can you tell which is which? The lighting board is from Walthers. The wires to the capacitor can be thin, as typically used wiring decoders. lt is possible long passenger trains with multiple cars would cause a problem by briefly drawing too much current when power is applied. If that happened, one fix would be to put a ten to about twenty Ohm resistor in either capacitor lead. This would reduce "keep alive" time a bit, as well as add complexity. The total modification cost per car would still be under half a dollar if the parts were bought from most online sources.


Re: Voltage measuring issue

Michael Berus
 

OPT switch 20 Closed, updated the internal battery

Thanks again
Mike
System working great.  Have op session scheduled


Re: Voltage measuring issue

Blair
 

Don

Ironically, twenty years ago, we'd mostly all have twigged to this, because so many were running mixed DC and DCC locos.  Now, not so much.

Blair

On 3/8/2022 4:41 PM, Don Vollrath wrote:
Well… I never thought of checking for DC loco control. Add using a track-track DC voltage reading as part of the diagnostics.

The 78% setting for a DC output also explains why the DC track-booster common reads about 1/2 the expected value from either rail without actually changing the peak-peak voltage actually seen and used by loco decoders.

DonV



Re: Voltage measuring issue

Don Vollrath
 

Well… I never thought of checking for DC loco control. Add using a track-track DC voltage reading as part of the diagnostics.

The 78% setting for a DC output also explains why the DC track-booster common reads about 1/2 the expected value from either rail without actually changing the peak-peak voltage actually seen and used by loco decoders.

DonV


Re: Voltage measuring issue

whmvd
 

Mike,

Or: just don't bother. Now that you know that it's only the voltage measurement that's off, and no other faults occur, there's no real need to care about this one way or the other.

Wouter


On Tue, 8 Mar 2022 at 16:41, Jim Betz <jimbetz@...> wrote:
Mike,
  I agree with Ross - disable operating DC using zero stretching ... in the command station settings
(called Option Switches by Digitrax).  Disabling it is so "standard" that we didn't even think of it as
a possible source of your "problem".  
                                                                                                             - Jim


Re: Voltage measuring issue

Jim Betz
 

Mike,
  I agree with Ross - disable operating DC using zero stretching ... in the command station settings
(called Option Switches by Digitrax).  Disabling it is so "standard" that we didn't even think of it as
a possible source of your "problem".  
                                                                                                             - Jim

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