Hey guys so I am working on the staging yard on a layout I just started. I am using tortoise switch machines with DS74 controllers. i know a DS74 has 4 ports for 4 switch machines. I was wondering can you hook up 2 tortoise switch machines to a single port on the DS74. Typicaly in a yard you would want the switch to throw on both ends no matter what so why not hook them together and save money on how man DS74s you use. Just wondering if anybody has tried it?
Alternative suggestion: Tortoises have an internal double-pole, double-throw switch that switches with the direction of the throw arm. Run a 12V DC power supply to the single pole of that internal switch and run wires from the other poles to power the other Tortoise. When the DS74 lines the first Tortoise, its internal switch will line the other.
--Steven Otte, Model Railroader senior associate editorsotte@kalmbach.com
Redhawk95,
Welcome to the forums. I don't have anything to add to the advice Steven Otte gave, but I hope you continue to post to this forum about your layout.
If you're able to, I also hope you can post some photos of things you are working on. I love pictures of layouts under construction.
York1 John
https://www.digitrax.com/media/apps/products/stationary-decoders/ds74/documents/DS74_flattened_rev.0.pdf
Looks like 70 ma max to me on the DS74. How much amperage are your Tortoises pulling?
Lee
Each Tortoise draws a bit more than 20 ma. when stalled; a lot less while moving. Two Torti on one output should be no problem. Double ended yard tracks or sidings are a great application for this.
Redhawk95 Typicaly in a yard you would want the switch to throw on both ends no matter what so why not hook them together
Looks like you got the answer on the DS74.
I will comment on your words in the blue box quote above. I will add that I like to have independently controlled switchs/turnouts at each end of a yard track or siding track.
I could be bringing a train in the ''east end'' of that track and if the ''west end'' switch/turnout is lined for that same track, no other train can go past the ''west end'' switch/turnout without running in to that same track or running against the switch/turnout.
Likewise if I take a ''west bound'' train off the main and into a siding and that train's tail end is not clear of the #2W switch/turnout yet and is still moving in to the siding, no other ''east bound'' train can pass the #2E switch/turnout at the other end.
Just another thought.
Steven Otte Alternative suggestion: Tortoises have an internal double-pole, double-throw switch that switches with the direction of the throw arm. Run a 12V DC power supply to the single pole of that internal switch and run wires from the other poles to power the other Tortoise. When the DS74 lines the first Tortoise, its internal switch will line the other.
My first experience with Tortoises was using them for both turnouts of a crossover. It works quite well with a 12V DC power supply. Originally, I used Atlas under mount switch machines but I found that when both were hooked to the same Atlas control box, the points wouldn't always get thrown completely resulting in derailments. Not a problem at all with the Tortoise machine. They have worked flawlessly for the past year since I installed them. I'm now preparing to replace some other problem Atlas switch machines with Tortoises.
UPDATE: I should have mentioned that I simply wired both Tortoises to the same DTDP switch and that has worked just fine. I hadn't thought of using one Tortoise to flip the other. It might be six of one or half a dozen of the other. I'm about to put Tortoises on another paired turnouts and might give this a try. It's simply a matter of making sure the polarity matches for both turnouts but you have to do that no matter which method you use.
we just completed building an interlock panel that uses pairs of LM324 op-amps to drive pairs of tortoise machines (crossovers). Tortoise machines draw the same current as an LED
greg - Philadelphia & Reading / Reading
John-NYBWMy first experience with Tortoises was using them for both turnouts of a crossover. It works quite well with a 12V DC power supply.
This worked for me, too. There was a lengthy string a couple months ago and one of the digressions involved my questions about how to wire this. I actually ended up using a 9-volt wall wort, which makes the switches move r-e-a-l s-l-o-w. Here was the post from Rich that helped me get my head around it, in case you need this.
richhotrain crossthedog richhotrain Wire the single DPDT with two wires to the DC power source. Wire the X-pattern on the DPDT. Wire the center terminals on the DPDT as the power source for the Tortoises. Now wire the Tortoises on terminals 1 and 8 and connect those four wires to the two wires extending off the center terminals of the DPDT. That's it. @Rich. Comme ça? Oui Rich
crossthedog richhotrain Wire the single DPDT with two wires to the DC power source. Wire the X-pattern on the DPDT. Wire the center terminals on the DPDT as the power source for the Tortoises. Now wire the Tortoises on terminals 1 and 8 and connect those four wires to the two wires extending off the center terminals of the DPDT. That's it. @Rich. Comme ça?
richhotrain Wire the single DPDT with two wires to the DC power source. Wire the X-pattern on the DPDT. Wire the center terminals on the DPDT as the power source for the Tortoises. Now wire the Tortoises on terminals 1 and 8 and connect those four wires to the two wires extending off the center terminals of the DPDT. That's it.
@Rich. Comme ça?
Oui
Rich
Returning to model railroading after 40 years and taking unconscionable liberties with the SP&S, Northern Pacific and Great Northern roads in the '40s and '50s.
crossthedog John-NYBW My first experience with Tortoises was using them for both turnouts of a crossover. It works quite well with a 12V DC power supply. This worked for me, too. There was a lengthy string a couple months ago and one of the digressions involved my questions about how to wire this. I actually ended up using a 9-volt wall wort, which makes the switches move r-e-a-l s-l-o-w. Here was the post from Rich that helped me get my head around it, in case you need this. richhotrain crossthedog richhotrain Wire the single DPDT with two wires to the DC power source. Wire the X-pattern on the DPDT. Wire the center terminals on the DPDT as the power source for the Tortoises. Now wire the Tortoises on terminals 1 and 8 and connect those four wires to the two wires extending off the center terminals of the DPDT. That's it. @Rich. Comme ça? Oui Rich
John-NYBW My first experience with Tortoises was using them for both turnouts of a crossover. It works quite well with a 12V DC power supply.
That's how I did mine but I also used terminals 2,3,4 to power the frog. I hooked 2&3 to my DCC bus lines and 4 to the frog. Amazon is supposed to deliver a new soldering iron today and then I will add three more Tortoises, two of which will be paired.
John-NYBWThat's how I did mine but I also used terminals 2,3,4 to power the frog.
-Matt
crossthedog John-NYBW That's how I did mine but I also used terminals 2,3,4 to power the frog. I've done a few of mine that way, too, but I didn't figure that part out until later (EDIT: Full disclosure: and I didn't figure it out...some kind soul here told me how to do it). I intend to go back and power all my frogs using posts 2, 3, and 4, but I haven't yet because it means I have to get under the layout with the soldering iron (bliiyeccchh). From now on, before I affix a Tortoise to the underside of the layout I solder foot long wires to posts 1, 2, 3, 4 and 8 and let 'em hang there until I need them. -Matt
John-NYBW That's how I did mine but I also used terminals 2,3,4 to power the frog.
I've done a few of mine that way, too, but I didn't figure that part out until later (EDIT: Full disclosure: and I didn't figure it out...some kind soul here told me how to do it). I intend to go back and power all my frogs using posts 2, 3, and 4, but I haven't yet because it means I have to get under the layout with the soldering iron (bliiyeccchh). From now on, before I affix a Tortoise to the underside of the layout I solder foot long wires to posts 1, 2, 3, 4 and 8 and let 'em hang there until I need them.
I intended to power frogs whenever I retrofit a turnout with a Tortoise but then I remembered if you power the frog, you need to insulate the diverging end of the turnout and the location of some of these turnouts makes that very difficult so I'm only powering frogs on a case by case basis.
I try to do all the soldering before installing the Tortoise but if you are powering a frog for a turnout you've already installed, you have no choice unless you want to disconnect and reinstall it. I used to solder my track feeders to the bus lines before I discovered suitcase connectors. That was 10-15 years ago. At my age, it's a chore to work under the benchwork now and I wouldn't want to do it with a soldering iron in my hand.
Thanks for all the help guys. I'll take in all the info and see what might work best.
Long time lurker, first time poster here. Admins, if you'd prefer that I start a new thread on this rather than replying to a two plus year old thread, I will gladly do so.
I have run into the exact same use case as the original poster, where I have a stationary decoder (specifally the Digitrax DS74) powering my tortoises, and have a crossover where I'd like to employ your solution of using one tortoise to control the other, but am having some trouble visualizing a couple of things as I'm still learning and I am hoping you (or anybody else reading) can chime in.
So this crossover has a tortoise on either end. One of the tortoises (the 'master') would be connected on ports 1 + 8 to the DS74. How to connect the other tortoise (the 'slave') is where I start to get fuzzy.
I get that there is two internal SPDT on the tortoise on ports 2/3/4 and 5/6/7. I also see that the single poles are on 4 and 5. So I guess I have two questions here.
First, lets say I pick the SPDT on ports 2/3/4. Do I hook up 2 and 3 on the master to 1 and 8 on the slave? If not, then what should these hookups be?
Second, you mention running a 12V DC power supply to the single pole, which in my example I think is port 4. Can you expand on this for a not quite intermediate electrician like myself? I have an old DC power supply laying around that I can use, but it has two wires. Which do I connect to the tortoise? Or do I need to do something else here?
Thanks in advance to anybody who can throw ideas my way. Happy railroading!
John