Traffic Light Switching Circuit

  This circuit allows a pendant type traffic light to be controlled by a Grade Crossing Signals circuit

  When a train triggers the crossing signals it will also switch the nearby traffic lights from their normal operation to flashing RED in all directions.

  This effectively turns the normal intersection signal into a four-way stop.

  The traffic signals used with this circuit are by SceneMaster. Walthers part numbers 949-4389 and 949-4363. Street corner traffic lights could also be used with this adapter.

  This circuit was developed for a specific layout that has a main track runnng near, and in parallel with, a major road with multiple crossings intersections.

  An 8PDT relay would be the ideal choice for this circuit but these are quite expensive so four - DPDT relays are used.

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Please Read Before Using These Circuit Ideas

  The explanations for the circuits on these pages cannot hope to cover every situation on every layout. For this reason be prepared to do some experimenting to get the results you want. This is especially true of circuits such as the "Across Track Infrared Detection" circuits and any other circuit that relies on other than direct electronic inputs, such as switches.

  If you use any of these circuit ideas, ask your parts supplier for a copy of the manufacturers data sheets for any components that you have not used before. These sheets contain a wealth of data and circuit design information that no electronic or print article could approach and will save time and perhaps damage to the components themselves. These data sheets can often be found on the web site of the device manufacturers.

  Although the circuits are functional the pages are not meant to be full descriptions of each circuit but rather as guides for adapting them for use by others. If you have any questions or comments please send them to the email address on the Circuit Index page.

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06 March, 2016