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Model Trains Circuits   Page 6
Model Trains:  #'s       A       B - C       D - E       F - G       H - K     
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Last Updated on: Tuesday, April 01, 2014 04:33 AM

Circuits Designed by Dave Johnson, P.E. :
  • HO Train Model Lighthouse Flasher
    HO train sets often have authentic looking scale model homes and buildings.  The hobby circuit below can be mounted inside a model lighthouse.  The electronic circuit drives a single LED lamp in such a way that it produces light which simulates the rotating light from a lighthouse beacon.  It uses a dual low power op amp IC.
  • HO Train Lighthouse Flasher Revisited
    HO train sets often have authentic looking scale model homes and buildings.  A while back someone asked me to design a flashing LED light, which he could mount inside a model lighthouse and have it operate so it would appear to rotate and flash.  I designed a working circuit but I was never pleased with the results.  I’m still not 100% pleased but the revised circuit below seems to operate a bit better than the older circuit....

Links to electronic circuits, electronic schematics, designs for engineers, hobbyists, students & inventors:

H-Bridge Direct Current Motor Control Circuits -  This page features H-Bridge circuits used for controlling direct current motors. Several designs are shown using both CMOS and Bi-Polar power devices….scroll to view all of the circuits…. [from Rob Paisley's Model Train web site]
Hendeca (11 Step) Resistance 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]
High Current - Crossing Light Flasher (LM556) -  This following circuit shows a simple grade crossing flasher with enough current capacity to drive 12 Volt lamps with 2 Amps current draw. The circuit could be used for open house displays, etc.  The flasher is driven by an LM556 dual time configured in a Push-Pull arrangement…..scroll down for this circuit....[from Rob Paisley's Model Train web site]
High Current Switch Machine Motor Driver -  Circuit for model railroad trains…. [from Rob Paisley's Model Train web site]
High Impedance Voltmeter -  This circuit is designed to provide an inexpensive way to to create a High Impedance Voltmeter while making use of an inexpensive analog or digital multimeter.    The circuit is specifically designed for testing phototransistors when they are used in the circuits shown at this site. It has a very high input impedance that will not "Load Down" the sensor that is being checked....Circuit for model railroad trains…. [from Rob Paisley's Model Train web site]
High Impedance Voltmeter Adapter -  Circuit for model railroad trains…. [from Rob Paisley's Model Train web site]
HIGH or LOW power switch -  Circuit for model railroad trains…. [from Rob Paisley's Model Train web site]
HIGH or LOW Power Switch For Lights or Small Motors -  Circuit could be used to operate lights or small motors in either high or low mode….Circuit for model railroad trains…. [from Rob Paisley's Model Train web site]
High Side Current Monitor Integrated Circuits -  The next circuit uses an integrated circuit that is specifically designed for this application. There are a number of manufactures of these devices and there is also a considerable variety of features that can be had from specific IC's….Scroll down for this design....Circuit for model railroad trains…. [from Rob Paisley's Model Train web site]

HO Train Model Lighthouse Flasher -  HO train sets often have authentic looking scale model homes and buildings.  The hobby circuit below can be mounted inside a model lighthouse.  The electronic circuit drives a single LED lamp in such a way that it produces light which simulates the rotating light from a lighthouse beacon.  It uses a dual low power op amp IC. …. [Hobby Corner Circuit by Dave Johnson]
Incandescent LED Circuit -  This circuit when used with a 555 timer will cause light emitting diodes to turn on and off more slowly.  This will make the LEDs ….Circuit for model railroad trains…. [from Rob Paisley's Model Train web site]
Incline Railway Circuit -  The drawings and photos below are for an operating incline railway that was built by the London Model Railroad Group for its 'O' scale model railway club located at London, Ontario, Canada.  This is a single car model loosely based on a double car incline that operated at Port Stanley, Ontario. [from Rob Paisley's Model Train web site]
Infrared Detection -  The following is a method to allow day and night detection using Infrared/Visible light sensitive phototransistors and a simple LM339 voltage comparator circuit. [from Rob Paisley's Model Train web site]
Infrared Light Photo-Detector Circuit -  In this circuit the light falling on the phototransistor will be from an Infrared Light Emitting Diode (IrLED) but otherwise it is the same as the phototransistor circuit shown above.  When the light falling on the phototransistor (Q1) is blocked, its conductance will decrease and the voltage across Q1 will rise....scroll to find this circuit....[from Rob Paisley's Model Train web site]
Infrared Receiver Module Schematics -  Some Information On Using Ir Receiver Modules…. [from Rob Paisley's Model Train web site]
Infrared Transmitter for Locomotives -  (electronic circuit added 4/05)
Interlocked Monostable Timers -  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]
IR Proximity Detector -  The circuits on this page are for an Infrared Proximity Detector using the Vishay Electronics TSOP4830 "IR Receiver Modules for Remote Control Systems"….Scroll down to view all the circuits…. [from Rob Paisley's Model Train web site]
IR Receiver Modules for 37 to 58KHz -  Some Information On Using Ir Receiver Modules…. [from Rob Paisley's Model Train web site]
Joy Stick Controlled Throttle information -  This page presents a new version of the 'Modernized "Toy" Throttle' circuit that is shown on the 'Various Transistor Throttles' page at this site.  This version was specifically design to be used by a handicapped person and is controlled by a single axis joy stick that operates microswitches at each end of its arc of travel. [from Rob Paisley's Model Train web site]
Knightrider lights for model cars -  This simple circuit drives 6 LEDs in 'Knightrider scanner mode'. Power consumption depends mainly on the type of LEDs used if you use a 7555 (555 CMOS version).  (electronic circuit added 11/06)

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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