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Model Trains Circuits   Page 9
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Last Updated on: Wednesday, July 16, 2014 06:35 AM


Links to electronic circuits, electronic schematics, designs for engineers, hobbyists, students & inventors:
Rail Crossing Diamond Protection -  The Crossing Diamond Protection circuit is designed to prevent collisions where one rail line crosses another. Using phototransistor sensors to detect a train the circuit will disconnect the track power from the line that crosses the occupied line. [from Rob Paisley's Model Train web site]
Railway Grade Crossing Flashers information -  The circuit on this page provides realistic operation of the flashing signals at a level grade crossing. The circuit uses six photo transistors to control the operation of the flashers and can easily supply up to four sets of LED flashers ( 8 LEDs).
RC Servo Motor Test Circuit (LM555) -  Circuit for model railroad trains…. [from Rob Paisley's Model Train web site]
Regulated Current Pulse Throttle -  The next throttle is more than a little different, it's very different but in its own unique way it works just fine. It is however posted here for interest sake only and should not be viewed as a major discovery or some sort of magic trick….. [from Rob Paisley's Model Train web site]
Regulated Power Supply Circuits -  The circuits on this page are for various type of voltage regulated power supplies…. [from Rob Paisley's Model Train web site]
Replacement For The LM3909 LED Flasher/ Oscillator -  This page features a replacement circuit for the LM3909 LED Flasher / Oscillator. The replacement circuit uses discrete components and is essentially the same as the internal circuit of the LM3909. [from Rob Paisley's Model Train web site]

RESET And CONTROL Input Terminal Notes -  Uses the LM555 timer or its cousins with other letter prefixes. There can be minor differences between 555 timer IC's from different manufacturers but they all should be useable for any circuit.   Designed for Model Trains…. [from Rob Paisley's Model Train web site]
RESET Terminal - Currents And Voltages -  Uses the LM555 timer or its cousins with other letter prefixes. There can be minor differences between 555 timer IC's from different manufacturers but they all should be useable for any circuit.   Designed for Model Trains…. [from Rob Paisley's Model Train web site]
Route Control For Stall-Motor Switch Machines -  This page shows some methods of track routing control for Stall-Motor type switch machines. The principle method uses a 2 Pole Multi Position rotary switch while an alternate uses optoisolators and transistors to select the routes. [from Rob Paisley's Model Train web site]
RS - Flip-Flop Made With A LM556 Timer -  Uses the LM555 timer or its cousins with other letter prefixes. There can be minor differences between 555 timer IC's from different manufacturers but they all should be useable for any circuit.   Designed for Model Trains…. [from Rob Paisley's Model Train web site]

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School Bus Signals Circuit -  The second circuit was designed to simulate school bus flashers that are to be found in the state of Oregon. The Loading/Unloading lights flash alternately RED or YELLOW depending on whether the bus is slowing down or has stopped and the door is open. [from Rob Paisley's Model Train web site]
SCR Throttle Circuits -  The following is a schematic drawing of a Silicon Controlled Rectifier type throttle for use on larger scale model railroads. Three versions of this throttle are shown on this page. They are not sophisticated designs but work well and are tough and reliable. [from Rob Paisley's Model Train web site]
Search Light Signals -  This page presents a Search Light type signal control circuit for model railroads. The circuit is an adaptation of the PNP 3 Light Model Railroad Signal Circuit shown on this site. [from Rob Paisley's Model Train web site]
Sequencing Circuit for Traffic Light Control -  This page features a circuit that has twenty open collector outputs that turn on one at a time in a continuous sequential manner. The circuit make use of the 74LSxx family of TTL integrated logic devices. The circuits are designed to drive light emitting diodes or low current, low voltage incandescent lights but can also drive other loads of up to 80 milliamps. [from Rob Paisley's Model Train web site]
Servo Motor Test Circuit (LM555) -  This circuit while crude is an inexpensive way to drive or test servo motor systems without the need for a compete system….Circuit for model railroad trains…. [from Rob Paisley's Model Train web site]
Shunt Ammeter Circuit -  The Circuit is for a 'Shunt' type ammeter that allows a meter movement with a small current rating to be used to measure a much larger current. In this example 1 milliamp through the meter coil will represent 1.5 amps by shunting most of the current through the 0.1 Ohm resistor. [from Rob Paisley's Model Train web site]
Shunting Lights for DCC Locomotives -  Digital decoders in model locomotives usually have two outputs for lighting functions. One switches the front lights for forward travel, and the other for reverse travel. If the locomotive has red rear lights, they are also connected to the two outputs. Many digital decoders include function mapping capability, which allows the switch functions to be assigned as desired. For example, with function mapping you can control the lighting not only for normal running, but also for shunting yard operations with the lights lit at both ends of the locomotive.….must register on this site....[Published in Elecktor July/August 2010]
Signal Breaking module -  (electronic circuit added 4/05)
Signals  (train signals) -  Signals that ACTUALLY operate add a high degree of realism to any model railway as well as being something additional for viewers to watch. Unfortunately they are sometimes omitted due to the complexity of controlling them realistically.  This article describes a module than can be readily fitted into an existing layout and used to control either two-aspect or three-aspect signalling systems....(circuit added 5/08)
Silicon Controlled Rectifier Model Railroad Throttles & London Model Railroad Group SCR Throttle -  The following is a schematic drawing of a Silicon Controlled Rectifier type throttle for use on larger scale model railroads. Three versions of this throttle are shown on this page. They are not sophisticated designs but work well and are tough and reliable. [from Rob Paisley's Model Train web site]
Simple Flashing Light Circuit 1 -  This project uses a 3909 IC and a few other parts; power is 1.5 volts DC…. [Designed by ML Rollins]
Simple Flashing Light Circuit 2 -  This project uses parts from Digi-Key… [Designed by ML Rollins]
Simple Flashing Light Circuit 3B -  The simplest flashing light circuit in the world! This is the simplest flashing circuit, suitable for tops of tall buildings, smokestacks and water towers… [Designed by ML Rollins]
Simple Signals Circuits -  This page presents signal driver circuits that are simple, efficient and inexpensive to build. These circuits provide only the most basic of signaling functions…. [from Rob Paisley's Model Train web site]
Simple train detector using ambient light & a photocell -  (electronic circuit added 4/05)
Single Traffic Light Driver -  The circuit on this page is designed to control a Single Three Light (Green Yellow Red) traffic light assembly. The the length of time that each light is lit is independently adjustable between 4 and 40 seconds for the parts values specified. [from Rob Paisley's Model Train web site]
Single Traffic Light Driver Circuit -  Circuit for model railroad trains…. [from Rob Paisley's Model Train web site]
Solid State Relays (E+F) -  These Relays would be ideal for applications where many relays are needed and the load current requirements are low. Due to their small size a large number of relays could be mounted on a single printed circuit board.  The relays are based on a 4N33 Optoisolator package.  This device has a Darlington....[from Rob Paisley's Model Train web site]
Special Function Timer Circuits (LM555) -  The following are LM555 timer circuits that have unusual functions….Circuit for model railroad trains…. [from Rob Paisley's Model Train web site]
Stall Motor Switch Machine Circuits information -  The circuits on this page are basic designs for "Diode Matrix" switch machine control systems that can be used to operate "Stall-Motor" switch machines in 'Ladder' type storage yards or other multiple turnout areas.  The driver circuits themselves use LM556 dual timer chips to reverse the polarity of the voltage to the switch machine motors. [from Rob Paisley's Model Train web site]
Stall-Motor - Switch Machine Drivers (LM556) -  The circuits on this page are Switch Machine drivers that can be used to operate slow motion Stall-Motor type switch machine motors. The circuits use LM556 dual timer chips to provide a PUSH-PULL output to reverse the polarity of the voltage to the switch machine motors. The output of the drivers is equivalent to a DPDT toggle switch....[from Rob Paisley's Model Train web site]
Stall-Motor Automatic Reversing Loop information -  This page shows an automatic Reversing Loop Switch Machine control circuit for Stall-Motor type switch machines. The switch machine used to develop this circuit is the Circuitron, Tortoise™ (Model number 800-6000) slow motion type switch machine motor….. [from Rob Paisley's Model Train web site]
Stall-Motor Switch Machine Drivers Circuitboards and parts -  This page shows an automatic Reversing Loop Switch Machine control circuit for stall motor or twin coil type switch machines. [from Rob Paisley's Model Train web site]
Station Stop Circuit -   The "Automatic Station Stop Circuit" brings a train to a station stop in two braking steps and then sends the train on it's way after a set period of time.    The first braking step slows the train gradually until it is at the station. The second brake step then stops the train just quickly enough to allow the first or second coach to stop in front of the station....[from Rob Paisley's Model Train web site]
Stepper Motor Driver-BIPOLAR -  This page features a Bipolar stepper motor driver using three ICs. The circuit can be used to drive relatively low speed applications at currents up to 0.6 amperes per phase. The circuit uses parts that are available from a variety of sources. [from Rob Paisley's Model Train web site]
Stepper Motor Driver-UNIPOLAR -  This page features a Bipolar stepper motor driver using three ICs. The circuit can be used to drive relatively low speed applications at currents up to 0.6 amperes per phase. The circuit uses parts that are available from a variety of sources. [from Rob Paisley's Model Train web site]
Stop / Start Motor Control Circuits -  The circuits on this page are for motor controls using Push buttons and would typically be found in commercial and industrial installations. The circuits do not show the wiring of the motors themselves as this depends on the particular motor type. The type of motor also governs the number of contacts needed for the motor side of these circuits....Circuit for model railroad trains…. [from Rob Paisley's Model Train web site]
Substitution Box -  This is an inexpensive way to make a stepped resistance box using a Single Pole Twelve Position rotary switch and eleven resistors for each switch. [from Rob Paisley's Model Train web site]
Sweeping Output Siren -  Uses the LM555 timer or its cousins with other letter prefixes. There can be minor differences between 555 timer IC's from different manufacturers but they all should be useable for any circuit.   Designed for Model Trains…. [from Rob Paisley's Model Train web site]
Switch Machine Drivers -  The circuits on this page are switch machine drivers that can be used to operate Stall-Motor type switch machine motors. The circuits use LM324 Quad or 358 Dual operational Amplifier chips to provide a PUSH-PULL output to reverse the polarity of the supply to the switch machine motors. [from Rob Paisley's Model Train web site]
Synchronous Crossing Light Flashers -  In the synchronous flasher control the oscillator is running at all times and the power to each set of flashers is turned on or off by the control circuit for that crossing. This allows any number of flasher sets at different crossings to controlled individually and yet flash in unison…..scroll down for this circuit....[from Rob Paisley's Model Train web site]

Model Trains:  #'s       A       B - C       D - E       F - G       H - K      L - M      N - Q        R - S       T        U - Z

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