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15 November 2008 Controlling Tortoise Machines with Momentary Contacts and a Diode-Matrix By Jerry Hoverson, MMR.

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Presentation on theme: "15 November 2008 Controlling Tortoise Machines with Momentary Contacts and a Diode-Matrix By Jerry Hoverson, MMR."— Presentation transcript:

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2 15 November 2008 Controlling Tortoise Machines with Momentary Contacts and a Diode-Matrix By Jerry Hoverson, MMR

3 15 November 2008 Controlling Tortoise Machines With Momentary Contacts Easy to install Reliable Rugged Provides slow, quit movement of points Provides constant pressure to hold points against stock rail Provides 2 sets of contact points Frog polarity control Panel indicator lights Switch indicator signals Has become the hobby standard for remote control of turnouts Why the Tortoise switch machine motor in the first place

4 15 November 2008 Controlling Tortoise Machines With Momentary Contacts The biggest disadvantage of the Tortoise switch machine motor is that it requires a constant, reversible 9-12 VDC power source.

5 15 November 2008 Controlling Tortoise Machines With Momentary Contacts So what happens if you try to control that turnout from more then one control panel with that constant power source?

6 15 November 2008 Controlling Tortoise Machines With Momentary Contacts Enter the 556 circuit! 556

7 15 November 2008 Controlling Tortoise Machines With Momentary Contacts Where you can control the Tortoise with MOMENTARY devices S8R1 + Momentary Pushbuttons Momentary DT Center Off Toggle Switch

8 15 November 2008 Controlling Tortoise Machines With Momentary Contacts Heres the circuit diagram for those who just have to have one. R1 2.2K R2 10K R3 10K + 12 VDC - 12 VDC IC1 LM556-B IC1 LM556-A C1 10uf + - D1 D2 Set Reset Tortoise ohm

9 15 November 2008 Controlling Tortoise Machines With Momentary Contacts OK, lets look at how we would install this on a simple track arrangement. MAINLINE Track A Track B Track C Track D

10 15 November 2008 Slave Control PanelMaster Control Panel Controlling Tortoise Machines With Momentary Contacts One method is to mount the 556 circuits in one master panel and then connect additional slave panels to the master S8R1 +

11 15 November 2008 Controlling Tortoise Machines With Momentary Contacts Whats good and whats bad about this method of installing? PROS 556 Circuit is accessible inside the control panel not under the layout Multiple circuits can be ganged together Single board Single power connection with Positive and Negative 12 VDC buses Only 2 wires going from main panel to Tortoise CONS Takes up real estate inside the control panel Depending on other items may be difficult to get to connectors Large number of wires going between each panel Hard to add another tortoise once complete

12 15 November 2008 Controlling Tortoise Machines With Momentary Contacts Heres a ganged set of 556 circuits in a control panel.

13 15 November 2008 Tortoise Controlling Tortoise Machines With Momentary Contacts Lets look at a general setup using a master panel. Tortoise MasterSlave 12 VDC 2-Wire (+ & -) 12 VDC 2-Wire from Master Panel (1 & 8) for Tortoise movement 16-Wire from Slave to Master (S & R) for control of each circuit (1 & 8) for LED indicators for each circuit 556 Tortoise 556

14 15 November 2008 Control Panel BControl Panel A Controlling Tortoise Machines With Momentary Contacts Another method is to mount individual circuits near each Tortoise Machine S8R1 +

15 15 November 2008 Controlling Tortoise Machines With Momentary Contacts PROS Frees up space inside the control panel Multiple circuits can be ganged together if tortoises are close together (i.e. a yard ladder) No massive bundle of wires between panels Simple to add another circuit between panels CONS Takes 4 wires from each panel to the tortoise Takes 2 wires to supply power to each circuit Set up as a bus and daisy chained Why use this method of installation?

16 15 November 2008 Controlling Tortoise Machines With Momentary Contacts Heres an individual circuit mounted near the Tortoise Machine

17 15 November 2008 Controlling Tortoise Machines With Momentary Contacts Lets look at a general setup using the individual 556 circuits mounted at the tortoises 556 MasterSlave 12 VDC 2-Wire (+ & -) power bus 4-Wire from Master (S & R) for control (1 & 8) for LED indicators 4-Wire from Slave (S & R) for control (1 & 8) for LED indicators

18 15 November 2008 Controlling Tortoise Machines With Momentary Contacts Now lets take this a step further and implement a Diode-Matrix to control several turnouts with a single button. Otherwise known as route control. A B C D E MAINLINE Track D Track C Track B Track A

19 15 November 2008 Controlling Tortoise Machines With Momentary Contacts To implement a Diode-Matrix you simply wire each button to an input on the matrix and the outputs of the matrix to the S & R connections on each 556 circuit A B C D E Well start by numbering each turnout Then we need to determine which direction is Set S or the default position S S S S The unmarked direction is then the R or Reset position If we push button A then 1=R, 2=S, 3=S, 4=S If we push button E then 1=S & we dont care about the others Mainline

20 15 November 2008 Controlling Tortoise Machines With Momentary Contacts Lets take a few minutes and set up our Diode-Matrix A B C D E S S S S R R R R SR 4 A B C D E SR 3 SR 2 SR 1 Remember, if we push Button A 1 goes to R 2 goes to S 3 goes to S 4 goes to S if we push Button B 1 goes to R 2 goes to S 3 goes to S 4 goes to R if we push Button C 1 goes to R 2 goes to S 3 goes to R 4 we dont care if we push Button D 1 goes to R 2 goes to R 3 we dont care 4 we dont care if we push Button E 1 goes to S 2 we dont care 3 we dont care 4 we dont care

21 15 November 2008 Controlling Tortoise Machines With Momentary Contacts So lets wire up the Diode-Matrix with the 556 Circuits A B C D E SR 4 A B C D E SR 3 SR 2 SR #1 - S8R #2 - S8R #3 - S8R #4 - S8R VDC Connect the buttons to the matrix inputs Connect matrix outputs to the 556 circuits Connect the buttons and the 556 circuits to ground Connect the 556 circuits to + 12VDC And last connect the 1 & 8 outputs on the 556s to the tortoise machines

22 15 November 2008 Controlling Tortoise Machines With Momentary Contacts OK, now that youve seen all the wonderful things a 556 circuit can do for you, what does it consist of and what does it cost? Parts List PartNominclaturePrice 2 x circuit board $ pin solder IC socket $ 0.20 C110uf Electrolitic Capacitor $ 0.16 D1"Set" Red LED $ 0.17 D2"Reset" Red LED $ 0.17 IC1LM556 $ 0.89 R12.2K Resistor $ 0.12 R2"Set" 10K Resistor $ 0.12 R3"Reset" 10K Resistor $ 0.12 S13-Socket Connector "+", "1", "R" $ 0.39 S23-Socket Connector "8", "S", "-" $ 0.39 $ 3.32

23 15 November 2008 Controlling Tortoise Machines With Momentary Contacts Here is what individual 556 circuits for mounting near the Tortoises looks like

24 15 November 2008 Controlling Tortoise Machines With Momentary Contacts The 556 circuit used in this presentation was developed by Rob Paisley Rob has published a lot of model railroad circuits, for example: Stall motor turnout controls like this one (several variations exist) Automatic grade crossing controls Traffic light control Infrared detectors Block occupancy detectors His web site: If you are interested in building this circuit and trying it out there are handouts available that include: Electrical diagram Parts list Parts layout diagrams Detailed step by step instructions on building the circuit

25 15 November 2008 Controlling Tortoise Machines With Momentary Contacts

26 15 November 2008 Controlling Tortoise Machines With Momentary Contacts R8S-+1R8S- 556


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