This circuit acts exactly like 3-way wall switches. Toggling either switch will change the position of the turnout from where it was. I can’t see any reason that you couldn’t extend this to as many DPDT switches as you might desire.

How do I wire up a bi color LED to a dpdt switch to use it as indicator of the switch condition? (This is for a stompbox mini switch). I have a 2-lead bi color LED, basically a red LED and a green LED in the same bulb, one north and one south.

Here is a simple schematic in jpeg form. Not my idea of the best user interface, but there you go. The one big disadvantage for this approach is that you can’t tell how the turnout is thrown from the position of either switch. So if you can’t see the turnout position, you would need some kind of indicator. – Mike Baynes • or to post comments. I use exactly the setup you desire.

Use Radio Shack part Number 275-709 ( DPDT CTR OFF spring ). I connected pwr source to center lugs. Tortoise connects to outside lugs ( either end, NOT both ends! You need the cross connection, in X fashion, to enable the polarity to reverse when switch is engaged. I actually have one turnout I control from three different places, works like a charm.

If you can't see the actual turnout, just throw the switch in the desired direction for 3 count. I use 9 volts from a battery pack, and it takes 3 seconds for Tortoise to go full over. I you are using PECO turnouts, and don't want to remove 'over center' snap spring, use a.032' music wire instead of stock Centronics wire. Just wire up all your switches the same. Good luck, • or to post comments.

Dear Rico, In basic terms, yes, Tortoises need constant power while changing position. However, once at the desired position, power can be removed and they will stay essentially where they were left. With 'centre off' toggles, just 'flicking' the toggle won't completely throw the Tortoise, you're absolutely on the ball there. However, if the user presses and holds the toggle, the Tortoise will make the desired movement. Using such centre-off/momentary toggles has the benefit of only powering any given Tortoise when it's in-motion. The power supply is not being loaded down by Tortoises 'at stall'. However, I forsee a potential issue is 2 or more operators all try to throw the same turnout (and thus are holding down their respective momentary toggles) at the same time.

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It's concievable that this could present a short circuit condition, with possible bad results. Personally, I'd opt to deploy a stall-motor 555-based circuit a la the Rob Paisley 'Electronics for model RRs' website. Multiple press-button (or momentary centre-off toggle) switches can be simply parallel connected, and are only switching 12V low-current logic lines. The 555-chip does not care if multiple operators try to throw the turnout at the same time, and will work out what to do if near-simultanous contradictory commands are recieved. (No risk of short circuiting the comparatively high-current Tortoise PSU either!) As always with Model RRing, there are umpteen different ways to peel a feline.

Happy Modelling, Aim to Improve, Prof Klyzlr • or to post comments.

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