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Author Previous Topic: One Hare controlling two turnouts? Topic Next Topic: Tortoise and LED wiring
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jbvb
Fireman

Premium Member


Posted - 01/08/2016 :  11:05:56 PM  Show Profile  Visit jbvb's Homepage  Reply with Quote
Thanks, Jim. I'll check to see if they fit the sockets I already have.

I got a 3-light interlocking signal to the point where it's ready for LEDs and assembly to the socket:



The unmodified sockets are at the top; the lower left one shows where I remove a couple of molding pins which interfere with the .100 x .125 styrene shim blocks.





(Sorry, all my photo tools read the camera's orientation out of the JPEG but RR-Line seems not to).

This one will be quite close to the audience, and ORS hadn't provided a long enough piece of ladder in their #130 kit. I used Free State Systems etched ladder and platforms, soldering all the brass/brass joints. This required care heat-sinking to avoid melting the signal head brackets that had to go between solder joints. And of course I mis-oriented some parts the first time...



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rca2
Engine Wiper

Posted - 01/09/2016 :  12:00:00 AM  Show Profile  Reply with Quote
Great thread, James. I am sooooo happy I only have to model a few O scale non-electrical semaphore train order signals.

Modeling Arizona Eastern Railroad, Hayden Junction (1920), in On30

Edited by - rca2 on 01/09/2016 12:01:21 AM

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MarkF
Engineer

Premium Member


Posted - 01/09/2016 :  01:13:00 AM  Show Profile  Reply with Quote
Thanks for all of the information on the IC sockets. I like the idea that the signals easily plug in and out, and as a side benefit, if they are hit, they will fall out rather than being damaged.

Mark

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BurleyJim
Fireman

Premium Member


Posted - 01/09/2016 :  08:29:02 AM  Show Profile  Reply with Quote
James,
Yep, those male pins will fit those sockets perfectly. Are you using an Apple product to take or manipulate your shots? You might check out this link http://rotatemailer.com/sideways-pictures.html

Jim



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jbvb
Fireman

Premium Member


Posted - 01/11/2016 :  11:08:18 PM  Show Profile  Visit jbvb's Homepage  Reply with Quote
Thanks, Bob & Mark. Jim, I'm not an Apple user. The Ristretto image viewer and the DigiKam archiver/editor both saw the flag in
the JPEG saying the camera had been in vertical format and displayed it that way. Next time I go to post one, I'll see what my options are;
simple 'rotate' doesn't seem likely to work.

Tonight I took a few more shots as I wired up the socket on the 3-head interlocking signal:



Here I'm starting to insert the LED leads into the IC sockets.



Here, they're all in, ready to solder. I used a 15W iron and Kester .020" rosin core 2% silver solder. And my binocular magnifier. And then I tested all the LEDs again.

Finally, I used solvent cement to bond the ORS base to the two shim blocks. Then I ACC-ed the signal heads in place. Next is wiring the fixed
socket. But I started digging around for my bag of heat-shrink tubing (which I was using last week) or my wire-wrap tool (which I haven't
used this decade, but did see last year, just can't recall where). After a while I decided to post this and go to bed.



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LVRALPH
Fireman



Posted - 01/12/2016 :  05:56:28 AM  Show Profile  Reply with Quote
James,

Can you give me a part number for your socket? Those round pins look more robust than the flat finger tabs on my IC sockets. Do you have ladder suggestions? Can you also give me a part # for the LED's. I would like to try them.



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jbvb
Fireman

Premium Member


Posted - 01/12/2016 :  08:27:10 AM  Show Profile  Visit jbvb's Homepage  Reply with Quote
Ralph, the socket is Mill-Max Manufacturing Corp. '110-44-308-41-001000', 'ED90048-ND' at Digi-Key.

The ladder visible here is an out-of-production etched part that Free State Systems used to make, their '8001-1'. Pack of 8 with platforms, nice etching, long enough for any configuration I'd need, but now only on eBay. The 'stagger block' on the last page uses the punched ladder that ORS includes.

I'm sacrificing flexibility for simplicity in implementation, so this particular signal uses 3 different LEDs to display Medium Clear, Medium Approach, Restricting and Stop: The top head is fixed red, Digi-Key #160-1704-ND. The middle is Oregon Rail Supply's stock bi-color LED. The bottom is a "3 mm red/yellow w/c 2 lead LED" from www.led-switch.com 'w/c' means 'water clear'.

LED Switch also has LEDs similar to ORS', though not with the translucent white 'diffusing' ORS uses. I could probably get a closer match at Digi-Key, but haven't felt the diffusing was a major priority.



Edited by - jbvb on 01/12/2016 08:32:34 AM

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MarkF
Engineer

Premium Member


Posted - 01/12/2016 :  09:53:25 AM  Show Profile  Reply with Quote
James, thank you for the close ups of how you wire the signal to the IC plug, as well as the parts information. Great stuff! You are motivating me to start working on my signals!

Mark

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jbvb
Fireman

Premium Member


Posted - 01/20/2016 :  9:10:08 PM  Show Profile  Visit jbvb's Homepage  Reply with Quote
Work continues, but I've found I'm not satisfied with a compromise I made early on. Most dwarf signals and a number of 3-light home interlocking signals will have a "Call On" aspect (yellow, or bottom yellow on a 3-light). I'm driving these from +/- DC voltage using a transfer contact on the associated turnout's relay. An example is R16T1 (relay) driving the bottom head of 16e (home signal) in the Newburyport diagram on the previous page.

This is OK for movements into unsignaled territory. But at Newburyport Draw, signal 16e shows "Call On" even when an EB train is in the block, and I want to do better. I would like to be able to drive a single bi-color LED based on whether or not an occupancy circuit is floating, or grounded. I could do this with a Circuitron SD-3, but they're $16 and about 2x4 inches. After a couple of fruitless hours searching the web for 'bipolar LED driver' and the like, I checked Paul Mallery's chapter on signals and found no help.

Can any actual EEs or serious electronics hobbyists suggest a circuit: one input (ground, float) +/-12 VDC power, 2 outputs (one per LED lead) switch polarity based on the input? Must be smaller/simpler/cheaper than an SD-3.



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jbvb
Fireman

Premium Member


Posted - 01/25/2016 :  11:05:27 AM  Show Profile  Visit jbvb's Homepage  Reply with Quote
Bulletin Order # 12, January 24 2016:

Eastward 3-light interlocking signal at MP 37.4, Newburyport (End of Double Track) and Westward 3-light interlocking signal at MP 37.7, Merrimack Draw have been placed in service.



The prototype had 500' between Merrimack St. and the end-of-double-track turnout, so their home signal had a conventional foundation. I had to imagine how they'd have addressed putting it atop the retaining wall, too close to the track centerline for a standard footing:



I set the socket in Wood Putty and built a styrene box to install around it, like they'd poured a pier set into the top of the wall. I'll put some rust spots on it to suggest anchors going deeper into the fill.



Here's the other end, showing the Call On aspect indicating the turnout is lined for the eastward track. I'm living with this for the moment: A friend I've known since MIT has a similar signal project at the North Shore club in Wakefield, and has offered to work with me on developing a board using a low-power H-bridge motor control chip, possibly one of the LN293x series. It will take a while, but knowing Joe, I'll like the result.



The westbound half of the interlocking has an SD-3 and a DCOD, set up to detect only the part of block 16 west of signal 16e. This avoids having 16e go red as soon as a WB train pulls out of its staging track, before the train reaches it.



The eastbound half has the relay for turnout 16T1 and the SD-3 for signal 16w1. I've since added a diode across the coil to protect the switch machine contacts.
[edit: picture taken before signal 16w was installed, as indicated by the test LED hanging from the SD-3's output terminals]

Next, I'll be working on the westbound track, which means beginning the occupancy detection in the Bexley Enginehouse area.



Edited by - jbvb on 01/26/2016 07:30:41 AM

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Orionvp17
Fireman

Premium Member

Posted - 01/25/2016 :  11:23:28 AM  Show Profile  Reply with Quote
Sweet! Nicely done!

The electronic talking-in-tongues stuff is way beyond me, but I really like the results.

Bravo!

Pete
in Michigan



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MarkF
Engineer

Premium Member


Posted - 01/26/2016 :  12:41:41 AM  Show Profile  Reply with Quote
I'm with Pete! And to think I want to do this on my railroad. But I like the results too!

Mark

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jbvb
Fireman

Premium Member


Posted - 01/26/2016 :  07:45:50 AM  Show Profile  Visit jbvb's Homepage  Reply with Quote
Thanks, Pete & Mark.

My career included both 'out where the streetcars don't run' software engineering and 'explaining to co-workers so I don't have to do it all myself' teaching. From a process PoV, I've broken signaling up into manageable (IMO) chunks local to individual signals and interlockings. I did circuit diagrams for those who work that way. The photos of the interlockings show how they look in real life, with narrative replacing sticky labels and wire tags all over the place (you may see the labels & tags when I get to the bi-directional double track part).



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jbvb
Fireman

Premium Member


Posted - 02/03/2016 :  11:42:44 PM  Show Profile  Visit jbvb's Homepage  Reply with Quote
Progress: Detection is in place on 8 of my 16 main line blocks. Signals protect operation over 5 of them.

Today I finally got the Bexley CTC (Extending from Saugus Jct. to D'Arcy Ave., under control of the Train Director at Bexley Tower) drawn sufficiently to my satisfaction. And I started wiring it.



First I'll build the simple interlocking at the end of double track (D'Arcy Ave.). Then the somewhat more complex one at Bexley Enginehouse (east portal of the tunnel). I'll probably have to revise the drawing to make room to document all the circuits between Bexley Enginehouse and Saugus Jct.

It's clearer in XTrkCAD, but I'm running out of screen. I may have to print it on multiple sheets next time.



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jbvb
Fireman

Premium Member


Posted - 02/10/2016 :  11:07:39 AM  Show Profile  Visit jbvb's Homepage  Reply with Quote
So while my unregulated phone/DSL company was waiting for the most economical time to repair their downed cable, I worked on the Bexley CTC (under control of the Train Director at Bexley Tower) design. And got far enough into it that I felt comfortable starting construction:



These interlockings are westbound-only, for the end of double track at D'Arcy Ave. and the west entrance to the yard just before the tunnel. Signals governing eastward movements through blocks 7, 9, 10 and 11 are at Bexley depot, west of the tunnel:



The easterly 'pole line' carries 3 circuits: occupancy indications for blocks 9 & 10 coming from the Bexley panel, and block 13 coming from East Bexley.

Between Bexley Enginehouse and D'Arcy Ave. there are 6 circuits: Occupancy for blocks 9, 10, 11 and 13, a circuit triggering Yellow from driver SD9e1 and a 'turnout reversed' from Bexley panel to control relay R9T1.

Let's consider D'Arcy Ave:

SD9e1 gets its Yellow input from Bexley Enginehouse. Red comes from Oc9 OR'ed with R9T1 'normal' (for eastbound moves). The diode keeps the turnout position from changing the state of Oc9 visible to other interlockings.

The top SPDT (transfer) contact on the relay does turnout position. When it's reversed, Oc11 is grounded (activated) preventing EB moves from taking the wrong track.

The second SPDT selects whether dwarf 9e2 gets + or - voltage, changing it from red to yellow.

I hope I've clarified things a bit, but I can try different words if these don't work. Once this is posted I'll get back to work on the Bexley Enginehouse interlocking and its yard exit dwarf signals.



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