Date   

Re: newbie question on turnout

Max Maginness <m.maginness@...>
 

YES



From: WiringForDCC@yahoogroups.com [mailto:WiringForDCC@yahoogroups.com] On
Behalf Of jeffrey.yung@ymail.com
Sent: Wednesday, May 27, 2009 6:51 PM
To: WiringForDCC@yahoogroups.com
Subject: [WiringForDCC] newbie question on turnout








Hi, I just bought fleischmann DCC starter kit and try to build my own
layout. I plan to have two trains running in opposite direction in one
track. Therefore certain sections are composed of two tracks connecting to
the the main track using turnouts. When I use fleischmann 9179, which I
guess is a electrofrog, if the loco going as the same direction as selected
in turnout, that's fine. However, when the loco entering from the a
direction opposite to selected in the turnout (i.e. Toe as output of the
turnout), short circuit happens.

I read the "Turnout Control" article and the "Scheme for Dual Track- Single
Track - Dual Track" seems to describe a solution to my problem. I'd like to
know if using insultforgs, e.g. fleischmann 9171, would produce the same
result?



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07:09:00


Re: DCC Circuit Board Setup

Blair
 

Fred
It may or may not help, but telling us where you're at might bring a helpful
person or two out of the woodwork. Sometimes a half-hour conversation over
a coffee can resolve, or avoid, hours of headscratching. In general DCC is
best NOT centralized, but there are other design caveats to be aware of.

Take care
Blair Smith

-----Original Message-----
From: WiringForDCC@yahoogroups.com [mailto:WiringForDCC@yahoogroups.com] On
Behalf Of acmee001
Sent: May 27, 2009 7:21 PM
To: WiringForDCC@yahoogroups.com
Subject: [WiringForDCC] Re: DCC Circuit Board Setup

Thank you Dale, Max and Doug. Your comments are helpful and appreciated. I
guess this is the problem with wiring and setup. My basic knowledge is
rudimentary to be bordering on worrisome/dangerous and the lack of
confidence re circuitry doesn't help so I looking for specifics. Am
beginning to reluctantly understand that flexibility/variability is perhaps
a feature of the system.

The centralisation concept came from the idea and ease of 'trouble shooting'
etc given that layout is not modular and reasonable large. I must confess,
I get somewhat confused with the manuals and the terminology plus the
various scenarios of intermixing boards - each with their own caveats for
operation. Thankyou for the documentation - I'll go through, try to apply
and progress onwards.

regards Fred (Caboose)



------------------------------------

http://www.WiringForDCC.comYahoo! Groups Links


newbie question on turnout

jeffrey.yung@ymail.com <jeffrey.yung@...>
 

Hi, I just bought fleischmann DCC starter kit and try to build my own layout. I plan to have two trains running in opposite direction in one track. Therefore certain sections are composed of two tracks connecting to the the main track using turnouts. When I use fleischmann 9179, which I guess is a electrofrog, if the loco going as the same direction as selected in turnout, that's fine. However, when the loco entering from the a direction opposite to selected in the turnout (i.e. Toe as output of the turnout), short circuit happens.

I read the "Turnout Control" article and the "Scheme for Dual Track- Single Track - Dual Track" seems to describe a solution to my problem. I'd like to know if using insultforgs, e.g. fleischmann 9171, would produce the same result?


Re: DCC Circuit Board Setup

acmee001 <acmee001@...>
 

Thank you Dale, Max and Doug. Your comments are helpful and appreciated. I guess this is the problem with wiring and setup. My basic knowledge is rudimentary to be bordering on worrisome/dangerous and the lack of confidence re circuitry doesn't help so I looking for specifics. Am beginning to reluctantly understand that flexibility/variability is perhaps a feature of the system.

The centralisation concept came from the idea and ease of 'trouble shooting' etc given that layout is not modular and reasonable large. I must confess, I get somewhat confused with the manuals and the terminology plus the various scenarios of intermixing boards - each with their own caveats for operation. Thankyou for the documentation - I'll go through, try to apply and progress onwards.

regards Fred (Caboose)


Re: DCC Circuit Board Setup

Doug Stuard <dstuard@...>
 

I'll second what others have said regarding centralization. It's better to place the various boards (i.e., BDL169s, DS64s, SE8Cs, etc.)near where they are needed to avoid gobs of wire to the devices at the savings of a few feet of LocoNet wire. That said, if you are thinking of NTRAK or another modular format that is set up and torn down frequently, putting it all in a box can be more convenient.

As to LocoNet schematics, you are talking about the schematic for a 6-wire cable! Can't get more basic than that. LocoNet connections through devices are simple parallel connections (UP panels do use diodes from the rail sync lines to provide power for throttles though). At some point on the net there needs to be ONE 15ma active pull up "termination" (all transmission is by pulling the LocoNet data line to ground, which all devices can "see"). This termination is normally provided in the command station, but other devices may be optioned to perform this function as well.

Whether the physical configuration of the LocoNet wiring is a daisy chain, a tree, or a combination, it's all the same electrically (good wiring practices assumed).

For more information on LocoNet, consult "LocoNet Personal Edition" from Digitrax:

http://www.digitrax.com/ftp/loconetpersonaledition.pdf

Doug Stuard

--- In WiringForDCC@yahoogroups.com, "acmee001" <acmee001@...> wrote:

I have currently being running digitrax DCC (Chief)for some time in a basic format with a BLD16 and a Tony's Reverser Unit. Given impending retirement and some extra time, I wish to re-install my setup into an old PC case and add the extra 'function boards' I collected in recent times. In terms of loconet connections, I have a BLD16, PM42, DS54, 16 I/O stationary decoder and a loco buffer. I will probably add an extra BLD16 in the near future.

I also have additional DCC boards such as the reverser, 5 x 4 unit point controllers and a DCC accessory decoder although it is logical that in time, this area will expand to incorporate signalling units.

My question is - what order should I place the loconet and accessory boards. I've be advised that they can 'go anywhere' in terms of hookup but I am reluctant to do this. I would very much prefer a sense of logical order and particularly so given that I wish to mount them within the same cabinet along with the Chief.

Can anyone please provide a schematic of the loconet (1) and the DCC accessory (2) and if there is any areas to be concerned about re installation. Note that all power supplies are separate to the cabinet. Thankyou for your time, regards "Caboose"


Re: DCC Circuit Board Setup

Max Maginness <m.maginness@...>
 

Centralizing the electronics may seem tidy but it negates the whole point of
DCC in consolidating track and turnout detail wiring locally and control by
using serial data over few wires rather than parallel data over a spaghetti
mess



Max



From: WiringForDCC@yahoogroups.com [mailto:WiringForDCC@yahoogroups.com] On
Behalf Of acmee001
Sent: Monday, May 25, 2009 6:33 PM
To: WiringForDCC@yahoogroups.com
Subject: [WiringForDCC] DCC Circuit Board Setup








I have currently being running digitrax DCC (Chief)for some time in a basic
format with a BLD16 and a Tony's Reverser Unit. Given impending retirement
and some extra time, I wish to re-install my setup into an old PC case and
add the extra 'function boards' I collected in recent times. In terms of
loconet connections, I have a BLD16, PM42, DS54, 16 I/O stationary decoder
and a loco buffer. I will probably add an extra BLD16 in the near future.

I also have additional DCC boards such as the reverser, 5 x 4 unit point
controllers and a DCC accessory decoder although it is logical that in time,
this area will expand to incorporate signalling units.

My question is - what order should I place the loconet and accessory boards.
I've be advised that they can 'go anywhere' in terms of hookup but I am
reluctant to do this. I would very much prefer a sense of logical order and
particularly so given that I wish to mount them within the same cabinet
along with the Chief.

Can anyone please provide a schematic of the loconet (1) and the DCC
accessory (2) and if there is any areas to be concerned about re
installation. Note that all power supplies are separate to the cabinet.
Thankyou for your time, regards "Caboose"



No virus found in this incoming message.
Checked by AVG - www.avg.com
Version: 8.5.339 / Virus Database: 270.12.36/2126 - Release Date: 05/24/09
07:09:00


Re: DCC Circuit Board Setup

Dale Gloer
 

Hello "Caboose". What's your real name? It's much more friendly to talk to someone when you know their name.

The short answer is that you can indeed put the connections in any order. However, you should also consult Digitrax's recommendations on placement of the boards on the layout in relation to where their function is used. A central location is not always the best I believe.

Also, there is a Digitrax specific group here on Yahoo and you will get a lot more opinions on your questions there than on this group which is mostly dedicated to the track level wiring and largely brand independent.

Dale Gloer

--- In WiringForDCC@yahoogroups.com, "acmee001" <acmee001@...> wrote:

I have currently being running digitrax DCC (Chief)for some time in a basic format with a BLD16 and a Tony's Reverser Unit. Given impending retirement and some extra time, I wish to re-install my setup into an old PC case and add the extra 'function boards' I collected in recent times. In terms of loconet connections, I have a BLD16, PM42, DS54, 16 I/O stationary decoder and a loco buffer. I will probably add an extra BLD16 in the near future.

I also have additional DCC boards such as the reverser, 5 x 4 unit point controllers and a DCC accessory decoder although it is logical that in time, this area will expand to incorporate signalling units.

My question is - what order should I place the loconet and accessory boards. I've be advised that they can 'go anywhere' in terms of hookup but I am reluctant to do this. I would very much prefer a sense of logical order and particularly so given that I wish to mount them within the same cabinet along with the Chief.

Can anyone please provide a schematic of the loconet (1) and the DCC accessory (2) and if there is any areas to be concerned about re installation. Note that all power supplies are separate to the cabinet. Thankyou for your time, regards "Caboose"


DCC Circuit Board Setup

acmee001 <acmee001@...>
 

I have currently being running digitrax DCC (Chief)for some time in a basic format with a BLD16 and a Tony's Reverser Unit. Given impending retirement and some extra time, I wish to re-install my setup into an old PC case and add the extra 'function boards' I collected in recent times. In terms of loconet connections, I have a BLD16, PM42, DS54, 16 I/O stationary decoder and a loco buffer. I will probably add an extra BLD16 in the near future.

I also have additional DCC boards such as the reverser, 5 x 4 unit point controllers and a DCC accessory decoder although it is logical that in time, this area will expand to incorporate signalling units.

My question is - what order should I place the loconet and accessory boards. I've be advised that they can 'go anywhere' in terms of hookup but I am reluctant to do this. I would very much prefer a sense of logical order and particularly so given that I wish to mount them within the same cabinet along with the Chief.

Can anyone please provide a schematic of the loconet (1) and the DCC accessory (2) and if there is any areas to be concerned about re installation. Note that all power supplies are separate to the cabinet. Thankyou for your time, regards "Caboose"


Re: Tortoise contacts for DPDT use

Allan <wire4dcc@...>
 

Rob,

Right. The PB-159-ND is nice because it comes with screw tabs that make it easy to mount to benchwork with the expense of a socket or the trouble of a circuit board. You can solder to it or use slip on electrical terminals. It also has an extra set of contacts, so that if you used up a set of contacts on your Tortoise, you can use these to replace them to drive signals, feedback to your computer or whatever.

Allan

--- In WiringForDCC@yahoogroups.com, "gnrybob" <Robmorrison@...> wrote:

--- In WiringForDCC@yahoogroups.com, "Allan" <wire4dcc@> wrote:

Rob,

Take another look at my site at:

http://www.wiringfordcc.com/track_2.htm#a9

Rather than using a reversing unit, I suggest you use a relay. This is easily half or a third the price of a reversing unit. I have two reversing loops at the end of my point to point railroad and this is how I control the reversing through the loops.

My relays are driven off a set of contacts on my switchmachines. If you use a Tortoise to do this, the Tortoise will still be slow as Don mentioned, but the relay will flip in an instant. You can still control the Tortoise with a DPDT switch.
====
Thank you Allan - I think I will go with the relay option for now. Per your Parts page it appears that DigiKey # PB159-ND is the best relay for this. Correct??
Rob


Re: Tortoise switch machine noise

Blair
 

Rich
Alternative - throw a full wave bridge in series with the 12VDC output -
guarantees polarity to the filter cap regardless of output polarity, and
drops the output by 1.4 V at the same time.
Blair

-----Original Message-----
From: WiringForDCC@yahoogroups.com [mailto:WiringForDCC@yahoogroups.com] On
Behalf Of rg
Sent: May 19, 2009 11:50 AM
To: WiringForDCC@yahoogroups.com
Subject: Re: [WiringForDCC] Tortoise switch machine noise


Just a WAG. Many power packs do not have pure DC. The DC many have do not
use filter capacitors so the DC is really pulsing at a line frequency. It
would be 60 hz for half wave rectifiers or 120 hz for full wave rectifiers.
I installed a 4700 ufd capacitor across the terminals of a power pack to
better filter the DC. My way.
BUT, I had to make sure the power pack reverse switch could not be moved. I
actually wired around the switch so I would not blow up the capacitor by
reverse voltage.
Again, my way. Your mileage may vary. I also reduced the power pack voltage
to 9 volts.

Rich

http://www.scroogle.org/




------------------------------------

http://www.WiringForDCC.comYahoo! Groups Links


Re: Tortoise switch machine noise

rg <richg_1998@...>
 

Just a WAG. Many power packs do not have pure DC. The DC many have do not use filter capacitors so the DC is really pulsing at a line frequency. It would be 60 hz for half wave rectifiers or 120 hz for full wave rectifiers.
I installed a 4700 ufd capacitor across the terminals of a power pack to better filter the DC. My way.
BUT, I had to make sure the power pack reverse switch could not be moved. I actually wired around the switch so I would not blow up the capacitor by reverse voltage.
Again, my way. Your mileage may vary. I also reduced the power pack voltage to 9 volts.

Rich

http://www.scroogle.org/


Tortoise switch machine noise

danielwatkins1953 <danielwatkins1953@...>
 

Hi Group!

I have 12 of my 24 tortoise switch machines installed and I'm noticing a really annoying buzzing which isn't just coming from the power source for the Tortoises.

I'm using my old Throttlepack transformer as a power source. It has three different power output terminals: variable DC, 16 volt AC, and 12 volt AC. I'm using the 12 volt DC and DPDT switches on my control panel. I've got heavy gauge bus wires going on a short run into the panel and then attached to feeder wires going to the toggles and then out to the Tortoises. According to the instructions from Circuitron, I should be able to operate 30 motors from this source. SEEMS like I've done everything right.

When I unhooked one of the bus wires from the Throttlepack to cut power to the motors, I could hear a slight hum from just it - always have, but when the motors are hooked up - very noticeable buzzing. I can actually get my ear up to some of them and hear it coming from the housing.

Any suggestions for reducing or eliminating the constant hum? I know
these are a constant on type of motor but this is really distracting and I
can't believe it's normal. Hate to think what it may be like when I have all 24
hooked up.

I greatly appreciate any assistance you can provide.

Dan


Re: Tortoise contacts for DPDT use

Vollrath, Don <dvollrath@...>
 

Rob - Why not a 12V relay? In my suggested diagram polarity of the track loop is controlled by an auto-reverser unit. The relay is powered from a mismatch in track voltage polarity between the balloon loop and mainline rails. Since the voltage is DCC, the difference is + polarity 1/2 the time and - polarity the other half. Adding the diodes half-wave recitfies the DCC track voltage into DC to power the relay coil...resulting in the average DC voltage being about 1/2 the DCC value, or ~6V. A 12V relay coil may not have enough voltage drive to work. A 5V relay will be slightly over driven, so that's why there is a resistor in series with the coil. As to what relay to select. Look for one with DPDT contacts (to reverse power to the Tortoise), a suitable mounting configuration (socket or PCB, etc.) and relatively low coil power (lower ma draw or higher coil ohms). Practically any small relay is suitable. The contacts that control the Tortoise motor only need to be rated for 0.1 amp at 30V or so to work "forever".
DonV

-----Original Message-----
From: WiringForDCC@yahoogroups.com [mailto:WiringForDCC@yahoogroups.com] On Behalf Of gnrybob
Sent: Monday, May 18, 2009 6:36 PM
To: WiringForDCC@yahoogroups.com
Subject: [WiringForDCC] Re: Tortoise contacts for DPDT use

--- In WiringForDCC@yahoogroups.com, "Vollrath, Don" <dvollrath@...> wrote:

What you are missing is that the DPDT contact sliders inside the
Tortoise move rather slowly. Power to the rails in the loop are likely to be interrupted for a significant time while the Tortoise changes the throwbar. The loco (and sound if you have it) will cease while the Tortoise does its thing. But if you really want to flip the switch manually, see Reverse Loop controller at http://www.wiringfordcc.com/sw_ctl.htm#a16. Substitute the manual DPDT switch to control and reverse the polarity of power to the Tortoise motor, wire the relay as shown with diodes across the switch motor, and wire the DPDT contacts of the relay to flip polarity of track power within the loop. We all predict you will soon get tired of flipping the manual switch and purchase an automatic alternative, like an A-R unit or Hare or Wabbit.
DonV
Thanks, Don. It had to be too good to be true, as they say.
Looking at the automatic balloon track control, you recommend a 5vdc relay, but looking at Digikey's site I find hundreds of options, some of which I do not understand. Why not a 12 vdc relay? In either case, could you recommend a particular one?
I already have a Lenz reversing module ( LK100), so that part is covered.

Thanks,
Rob



------------------------------------

http://www.WiringForDCC.comYahoo! Groups Links


Re: Tortoise contacts for DPDT use

gnrybob <Robmorrison@...>
 

--- In WiringForDCC@yahoogroups.com, "Allan" <wire4dcc@...> wrote:

Rob,

Take another look at my site at:

http://www.wiringfordcc.com/track_2.htm#a9

Rather than using a reversing unit, I suggest you use a relay. This is easily half or a third the price of a reversing unit. I have two reversing loops at the end of my point to point railroad and this is how I control the reversing through the loops.

My relays are driven off a set of contacts on my switchmachines. If you use a Tortoise to do this, the Tortoise will still be slow as Don mentioned, but the relay will flip in an instant. You can still control the Tortoise with a DPDT switch.
====
Thank you Allan - I think I will go with the relay option for now. Per your Parts page it appears that DigiKey # PB159-ND is the best relay for this. Correct??
Rob


Re: Tortoise contacts for DPDT use

Allan <wire4dcc@...>
 

Rob,

Take another look at my site at:

http://www.wiringfordcc.com/track_2.htm#a9

Rather than using a reversing unit, I suggest you use a relay. This is easily half or a third the price of a reversing unit. I have two reversing loops at the end of my point to point railroad and this is how I control the reversing through the loops.

My relays are driven off a set of contacts on my switchmachines. If you use a Tortoise to do this, the Tortoise will still be slow as Don mentioned, but the relay will flip in an instant. You can still control the Tortoise with a DPDT switch.

If you want to get fancy, my mainline turnouts are all controlled by Digitrax DS-54's. The DS-54 isn't the most modern controller. It was state-of-the-art at the time. In any event, I have optical sensors in the legs of my reverse loops. When the train comes around the loop, it triggers the DS-54 to throw the turnout. If you do this, you need to have the sensor far enough back from the turnout that the turnout will fully throw at your train's typical speed. Remember, you are using a slow Tortoise! The optical sensors make the operation of my reversing loops completely automatic and hands free! Our Don Vollrath makes the optical sensors.

Allan

--- In WiringForDCC@yahoogroups.com, "Vollrath, Don" <dvollrath@...> wrote:

What you are missing is that the DPDT contact sliders inside the Tortoise move rather slowly. Power to the rails in the loop are likely to be interrupted for a significant time while the Tortoise changes the throwbar. The loco (and sound if you have it) will cease while the Tortoise does its thing. But if you really want to flip the switch manually, see Reverse Loop controller at
http://www.wiringfordcc.com/sw_ctl.htm#a16. Substitute the manual DPDT switch to control and reverse the polarity of power to the Tortoise motor, wire the relay as shown with diodes across the switch motor, and wire the DPDT contacts of the relay to flip polarity of track power within the loop. We all predict you will soon get tired of flipping the manual switch and purchase an automatic alternative, like an A-R unit or Hare or Wabbit.
DonV

-----Original Message-----
From: WiringForDCC@yahoogroups.com [mailto:WiringForDCC@yahoogroups.com] On Behalf Of gnrybob
Sent: Monday, May 18, 2009 12:51 PM
To: WiringForDCC@yahoogroups.com
Subject: [WiringForDCC] Tortoise contacts for DPDT use

Hi,
I am planning a reversing loop primarily to turn locomotives off the end of a small staging yard. There are various schemes to accomplish this including several on Allan's site. All involve using reversing modules and other components. Here is my question:

Can I use just the contacts in a Tortoise to swap "polarity" (actually swap phasing of the AC like DCC signal). This reversing loop will be purely manual control. The operator will run the loco into the loop, then, once the loco is fully in the loop, throw the turnout at the entrance to the loop and by doing so reverse the DCC feeds under the loco and align the turnout for the loco to exit the loop. Control of the Tortoise will be by a DPDT switch. Since there are two SPDT contact sets in the Tortoise, I think I can use one set for each rails' feeder.

I realize that some modification of the contact wiper will be required.

Now, what did I miss in this scheme?

Thanks,
Rob Morrison



------------------------------------

http://www.WiringForDCC.comYahoo! Groups Links


Re: Tortoise contacts for DPDT use

gnrybob <Robmorrison@...>
 

--- In WiringForDCC@yahoogroups.com, "Vollrath, Don" <dvollrath@...> wrote:

What you are missing is that the DPDT contact sliders inside the Tortoise move rather slowly. Power to the rails in the loop are likely to be interrupted for a significant time while the Tortoise changes the throwbar. The loco (and sound if you have it) will cease while the Tortoise does its thing. But if you really want to flip the switch manually, see Reverse Loop controller at
http://www.wiringfordcc.com/sw_ctl.htm#a16. Substitute the manual DPDT switch to control and reverse the polarity of power to the Tortoise motor, wire the relay as shown with diodes across the switch motor, and wire the DPDT contacts of the relay to flip polarity of track power within the loop. We all predict you will soon get tired of flipping the manual switch and purchase an automatic alternative, like an A-R unit or Hare or Wabbit.
DonV
Thanks, Don. It had to be too good to be true, as they say.
Looking at the automatic balloon track control, you recommend a 5vdc relay, but looking at Digikey's site I find hundreds of options, some of which I do not understand. Why not a 12 vdc relay? In either case, could you recommend a particular one?
I already have a Lenz reversing module ( LK100), so that part is covered.

Thanks,
Rob


Re: Tortoise contacts for DPDT use

Vollrath, Don <dvollrath@...>
 

What you are missing is that the DPDT contact sliders inside the Tortoise move rather slowly. Power to the rails in the loop are likely to be interrupted for a significant time while the Tortoise changes the throwbar. The loco (and sound if you have it) will cease while the Tortoise does its thing. But if you really want to flip the switch manually, see Reverse Loop controller at
http://www.wiringfordcc.com/sw_ctl.htm#a16. Substitute the manual DPDT switch to control and reverse the polarity of power to the Tortoise motor, wire the relay as shown with diodes across the switch motor, and wire the DPDT contacts of the relay to flip polarity of track power within the loop. We all predict you will soon get tired of flipping the manual switch and purchase an automatic alternative, like an A-R unit or Hare or Wabbit.
DonV

-----Original Message-----
From: WiringForDCC@yahoogroups.com [mailto:WiringForDCC@yahoogroups.com] On Behalf Of gnrybob
Sent: Monday, May 18, 2009 12:51 PM
To: WiringForDCC@yahoogroups.com
Subject: [WiringForDCC] Tortoise contacts for DPDT use

Hi,
I am planning a reversing loop primarily to turn locomotives off the end of a small staging yard. There are various schemes to accomplish this including several on Allan's site. All involve using reversing modules and other components. Here is my question:

Can I use just the contacts in a Tortoise to swap "polarity" (actually swap phasing of the AC like DCC signal). This reversing loop will be purely manual control. The operator will run the loco into the loop, then, once the loco is fully in the loop, throw the turnout at the entrance to the loop and by doing so reverse the DCC feeds under the loco and align the turnout for the loco to exit the loop. Control of the Tortoise will be by a DPDT switch. Since there are two SPDT contact sets in the Tortoise, I think I can use one set for each rails' feeder.

I realize that some modification of the contact wiper will be required.

Now, what did I miss in this scheme?

Thanks,
Rob Morrison



------------------------------------

http://www.WiringForDCC.comYahoo! Groups Links


Tortoise contacts for DPDT use

gnrybob <Robmorrison@...>
 

Hi,
I am planning a reversing loop primarily to turn locomotives off the end of a small staging yard. There are various schemes to accomplish this including several on Allan's site. All involve using reversing modules and other components. Here is my question:

Can I use just the contacts in a Tortoise to swap "polarity" (actually swap phasing of the AC like DCC signal). This reversing loop will be purely manual control. The operator will run the loco into the loop, then, once the loco is fully in the loop, throw the turnout at the entrance to the loop and by doing so reverse the DCC feeds under the loco and align the turnout for the loco to exit the loop. Control of the Tortoise will be by a DPDT switch. Since there are two SPDT contact sets in the Tortoise, I think I can use one set for each rails' feeder.

I realize that some modification of the contact wiper will be required.

Now, what did I miss in this scheme?

Thanks,
Rob Morrison


Re: Mars Light Install Question

rg <richg_1998@...>
 

There is an active Yahoo SoundTraxx group with a couple online DCC supliers and some other DCC experts. Click on the links below.

http://groups.yahoo.com/group/soundtraxx/

Marcus has a lot of good DCC information. Store the links in your Favorites Folder.

http://www.members.optusnet.com.au/nswmn/index.htm

Rich

http://www.scroogle.org/


Re: Mars Light Install Question

Allan <wire4dcc@...>
 

Terry,

I checked out one of the Tsunami manuals and didn't see any reference for using a 22 ohm resistor with a 16V bulb. Still, I recommend that you do so whenever using special effects. When using special effects with most decoders and a light bulb, the bulb has a high inrush current. Decoder manufacturers for years have recommended a 22 ohm resistor to limit the inrush current. This prevents decoder damage. If you have a real aversion to using the resistor, I suggest you ask Soundtraxx or get on one of their help chat groups.

Allan

--- In WiringForDCC@yahoogroups.com, "Terry" <terryintexas7@...> wrote:

I want to install a Mars light into my Athearn F-7
Using a Tsunami TSU 1000 Decoder
If I understand correctly I can use either the brown or green wire
and the blue wire as common and then assign it to function 5 or 6
Question is do I HAVE TO use a resistor if i'm using a 16 volt
grain of wheat bulb
TIA
TerryinTexas

9761 - 9780 of 13047