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RobertW

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  1. Hi, I'm currently using AutoCAD Electrical 2018 to do various 2D drawings for my railway, mainly electrical schematics and 2D orthogonal drawings for buildings and veroboard layouts. I got it when I was a student on a 3 year licence, which expires in September. I'm starting to look for a replacement for it, that is preferably either free or has a one off fee rather than a subscription. It would need to be able to import Autodesk DWG/DXF file types as I have a number of CAD files that I've built up over the years that I would rather keep rather than redraw. I also have Autodesk TrueView, so it isn't too onerous to covert files. I'm not too fussed about 3D modelling, although it would be nice to have if possible. Does anybody have any suggestions I could take a look at? Thanks Robert
  2. Hi, I've recently purchased a Hornby Jinty, and I'm going to repaint it as an industrial loco. I've done some google research, and I've seen the Crigglestone one by Paul Lunn, and the W.Pepper & Sons that Bachmann have done, but are there any other well known industrial liveries that I could use. My microlayout is set in the Manchester area if that helps. Thanks, Rob
  3. Hi All, I'm currently designing an LM317 based model railway controller for a shunting layout (essentially just using the standard LM317 circuit with the resistors trimmed for a maximum of 9V). I'm trying to add inertial simulation to the controller, but I'm not sure how would be best to do it. On previous controllers where I'm using a Darlington circuit, I can add it to the base of the Darlington. It occurred to me that I could add a capacitor between the adjustment pin of the regulator and ground it would gradually decrease the voltage on the adjust pin, which would then lower the output voltage slowly as well, but this would be harder to control in terms of the amount of inertia provided and it would possibly have to be quite large to sustain the inertia. Does anyone have any suggestions on how to use an inertial simulation element with an LM317 regulator. Thanks, Rob
  4. Thanks for this input. I hadn't considered using 74XX circuits, because if I'm building a module, I generally don't have enough circuitry to use up all of the gates, and I don't like wasting the rest of the chip. On this project, I've managed to use up all the chips. I'll post the new schematic tomorrow, and I'm going to breadboard it tomorrow as well. Thanks for your help. Rob Track_Circuit_Veroboard.pdf TrackCircuitSchematic.pdf
  5. Just an update on this, I've solved the issue. It was due to inverting the potential divider R2-R3. I've attached an updated schematic to this post, including the integral power supply and track circuit. It's designed to be fed from the 16VAC layout auxillary system. I've designed this circuit for use with Train-Tech signals, which are common ground, hence the need to convert the driver to Common-Cathode. The circuit designs is based on Roger Amos' design for a signal driver and bi-directional track circuit, however, I have converted it to Common Cathode, as well as incorporating manual override. Whilst the drawing denotes the functional blocks of the system, the boards are integrated, with a track circuit, signal driver, and AC/DC converter on 1 veroboard. Please let me know if you have any comments. Thanks, Rob Signal_Driver_Rev_C.pdf
  6. Hi, I've redrawn the schematic in Eagle. Please see attached. Thanks, Rob
  7. Hi, I've got the below circuit. I'm driving the input from a track circuit. The system will be a 2 aspect signal driver. The circuit is currently designed for common anode signals. I'm looking for a common cathode driver. What do I need to do to convert this to common cathode. The circuit takes an active low input from the track circuit. Apologies for the poor diagram, I'll try to draw it properly in AutoCAD tomorrow if required, although it's based on figure 15.2 of Roger Amos' Complete Book of Model Railway Electronics. Thanks Robert
  8. Hi, I'm working to restore some wiring on a layout that has been stored for at least 6 months. I've tested all the Seep point motors, and have found that one won't throw properly. I've tried to throw it by hand, and works perfectly, so I'm leaning towards an electrical problem. I've buzzed out all the leads from the CDU to the Peco switch, and then back to the point motor. I found that there was a broken solder joint, which I've fixed. I've checked that the coils are continuous, and that there is continuity back to the switches, and the returns to the CDU. I'm running out of ideas to check, and would welcome some advice. Thanks, Rob
  9. Hi Alan, You can check the resistance of the coil by setting the meter to its lowest resistance setting, which will be indicated by an omega symbol. If you place the first probe on a connection to one side of the switch, and the other on the common connection if you are using a Hornby version, or the solder tag at the same end of the motor but on the opposite side if you are using a peco version. If you can post a photo of the motor, I can confirm the terminals which need probing. Please let me know if you have any further questions. Kind regards Rob
  10. My background is in electronics, so I like to include things like signals on my layouts. I've attached the drawing, which I realised wasn't on my reply. I included some on my last layout, but wanted to improve the realism of the placement and types of signals that I used. Thanks, Rob SCENIC_TRACK_PLAN.pdf
  11. Hi All, Apologies for the delayed response, I've have managed to draw up the track plan I'm working on. There will be a cassette fiddle yard on the right of the drawing, but I still need to design this in. I'm intending for the lower road to be the long curved siding, designed for 3 SLUs. The middle 2 roads will be considered 1 road for the Inglenook system, making 2 SLUs, the top road will also be intended for 2 SLUs. I'm currently thinking a position light on the heels of each point, making 4 and one on the long road, there will then be a position light and theatre indicator on the entries to each point. There will be a 3 aspect signal on the exits to the fiddle yard. It will be in a industrial, urban area in the late 1960s to the early 1970s, a small exchange sidings in the Trafford area of Manchester, between the MSC and BR lines. I'm currently developing the logic circuit for this, and I'm wondering if there what the best model of a ground position light, both with and without theatre indicators. Please let me know if you need any more information. Thanks in advance, Rob
  12. Hi All, I'm starting to plan my next layout,which will be a 3-2-2 inglenook, based in the late transition era in the LMR. I'm planning on using colour light signalling, which will be functional, with electronic drivers, once I've figured out what the logic will be. How would I signal it. I'm thinking a 3 aspect signal as a home on the exit, but I'm not sure how to signal the shunting signals. I'm not sure if I'll track circuit it, or the signals will be manually operated. I'm happy with the electrical side of things, just unsure of the location and number of aspects for the signals. I'll post a drawing tomorrow if I get the time to draw it, otherwise it'll probably be towards the weekend. Thanks in advance, Rob
  13. Hi Neil, The answer is, it depends. Assuming that the lamps are LEDs, then if you wire all the positives together and all the negatives together (in parallel), then a resistor is required in the positive supply to each lamp. If you wire them positive to negative, then you need to be careful as to how many LEDs you connect between the positive and negative. Do you have a link to the product, as there are a couple of numbers in the specification that could make the difference. If you want a simple answer, then this site may give you a good answer, assuming all of the LEDs are the same colour and type. http://led.linear1.org/led.wiz Hope this helps, Rob - Edited to simplify the explanation
  14. Hi I'm currently building a 2-storey warehouse structure. It's based around a low relief version of the Dapol booking hall. I'm using the double door entrances to the kit as a hoist. I'm not sure of the design of the hoist support at the top. I'm thinking of some kind of structure constructed of I-beams. Does anybody have any examples of hoist supports, or any guidance on designing my own? Thanks in advance, Rob
  15. I think that we are using Mitsubisi MELSEC units. They began to teach the basics of Ladder Programming last week using the worlds most inefficent PLC programmer. StL is The three letter word for Statement Listing (like FBD (Function Block Diagram)). Rob
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