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Model Circuits     Page 2
Model Airplane Circuits     Model Train Circuits
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Last Updated on: Thursday, October 30, 2014 09:22 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.

Links to electronic circuits, electronic schematics, designs for engineers, hobbyists, students & inventors:
A 3 Amp, Three Terminal Regulator Type Throttle (E+F) -  The schematic above is of a Three Terminal Regulator (TTR) design based on a LM350K regulator which has a 3 Amp current rating as opposed to the LM317K with a 1.5 Amp rating. [from Rob Paisley's Model Train web site]
A Digital speed control with BEC  -  A digital speed control with BEC (electronic design added (11/06)
A Dual Alternating Flashing Light Circuit -  This project is best for mounting on a layout to light a crossing or ring a bell. (circuit diagram added 05/06/07)
A Dual Tandem Flashing Light Circuit Powered by a 9 Volt Battery -  (circuit added 05/06/07)
A High Speed NiCd Charger for Electric R/C -  A few years back, I published a design for a Low Cost Thermal Peak Detection Charger. Since then, I've designed several other chargers, in my ongoing quest to avoid having to spend money. Of course, in building all these designs, I've probably spent more than a really good commercial charger would have cost me. But designing and building is half the fun....[Stefan Vorketter]

A Low Cost Thermal Peak Detection NiCd Charger -  The electric model aircraft and car industries have produced a bewildering array of field chargers for NiCd motor battery packs. These range from simple 6 or 7 cell chargers consisting of a resistor and mechanical timer, to more complex chargers with peak detection, cycling, and the ability to handle 36 cell packs....[Stefan Vorketter]
A maxi speed control with brake -  A "maxi" speed control with brake (circuit added 11/06)
A miniature high-rate speed control -  A miniature high-rate speed control published in  newsletter published by Electric Model Flyers' of Southwestern Ontario (diagram add
A miniature low-rate speed control -  A miniature low-rate speed control published in  newsletter published by Electric Model Flyers' of Southwestern Ontario (diagram added 11/06)
A Modernized Toy Throttle -  This throttle is an upgrade of the type of throttle that is supplied with many of the HO train sets that are popular at Christmas time. These throttles do not have a reversing switch but instead have a center OFF position on the speed control knob…..several circuits shown be sure to scroll down to see all of them....[from Rob Paisley's Model Train web site]
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A simple miniature speed control with brake -  A simple miniature speed control with brake (circuit added 11/06)
A Three Terminal Regulator Type Throttle -  The schematic above is of a Three Terminal Regulator (TTR) design based on a LM350K regulator which has a 3 Amp current rating as opposed to the LM317K with a 1.5 Amp rating. [from Rob Paisley's Model Train web site]
Across The Track Infrared Detectors -  This page presents information on infrared 'Across The Track' train detection circuits. The circuits are designed around the LM339 comparator chip and can use a wide assortment of matched infrared emitter / detector pairs. [from Rob Paisley's Model Train web site]
Adding External Meters to DC Throttles -  Typical analog meters must be added before the reversing switch. 'Centre zero' meters can be connected after the reversing switch.   Digital meters could easily be added to the output of a DC throttle so that they indicate, volts, current and polarity of the output.….Circuit for model railroad trains…. [from Rob Paisley's Model Train web site]
Advanced Circuits For The LM555 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]
An Ammeter Made From A Voltmeter -  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]
AN-673: 2-Way Multiplexed LCD Drive & Low Cost A/D-Converter using V/F Techniques with COP8 MicroControllers -  National Semiconductor Application Note....[App Note]
AN847: RC Model Aircraft Motor Control -  Microchip Application Note Published 18-Jul-02  (app note added 2/06)
Analog Bar Graph Expanded Scale Voltmeter -  An expanded scale voltmeter (ESV) can save your plane. That may be a strong statement, but it's true. The crucial radio link that lets you control your plane relies on nickel-cadmium (NiCd) batteries in the transmitter and receiver… [Stefan Vorketter]
Angelfire rocket GPS payload -  (schematic / circuit added 05/06/07)
Animatronic Snake Throat Muscle Controller -  (circuit diagram added 05/06/07)
AT Power Supplies -  "AT" type computer power supplies are often used by model railroaders to provide accessory power for their layouts. These supplies are reasonably inexpensive due to their age and have been removed from old personal computers. [from Rob Paisley's Model Train web site]
Audible Train Approach Warning Circuit -  This is a circuit that will give an audible warning that a train is entering a particular section of track. The detector also has a LED that indicates when a train is entering or leaving the block. [from Rob Paisley's Model Train web site]
Automatic Grade Crossing Flasher Circuit -  The circuit is upgraded version of the 2004 Railway Grade Crossing Circuit shown on this site. The upgrade allows the circuit to automatically control crossing signals and gates in a prototypical manner. [from Rob Paisley's Model Train web site]
Automatic Grade Crossing Flashers -  The circuit is upgraded version of the 2004 - Railway Grade Crossing Circuit shown on this site. The upgrade allows the circuit to automatically control crossing signals and gates in a prototypical manner. The circuit uses a bidirectional time delay that staggers the gates and lights so that they operate as would be seen at a typical crossing. [from Rob Paisley's Model Train web site]
Automatic 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]
Automatic Reversing Circuit Mk IV -  This page is for an automatic direction reversing circuit that will control the point to point operation of a "shuttle" such as an RDC car or a short train. The shuttle will travel from one end of the track to the other wait for a preset time and then return to its start point, wait and then repeat the cycle. [from Rob Paisley's Model Train web site]
Automatic Reversing Circuit Mk VII -  This page is for an automatic direction reversing circuit that will control the point to point operation of a "shuttle" such as an RDC car or a short train. The shuttle will travel from one end of the track to the other wait for a preset time and then return to its start point, wait and then repeat the cycle. The circuit is also capable of being controlled by one or more automatic station stops as the SHUTTLE travels along the track. [from Rob Paisley's Model Train web site]
Automatic Reversing Circuits Inexpensive -  This page presents a low tech, low cost and reasonably simple automatic reversing circuits. They uses toy train set power packs to control the top speed of the shuttle while diodes in the track circuit provide a method of stopping the shuttle at the ends of the track as well as crude control of the trains acceleration and deceleration. [from Rob Paisley's Model Train web site]
Automatic Reversing Loop -  This page is about automatic reversing loop control circuits. The first switch machine controller is very basic. More complicated circuits will be added as they can be thought up and tested out. [from Rob Paisley's Model Train web site]
Automatic Reversing Loop Control Circuit -  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]
Automatic 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]
Automatic-Railway Grade Crossing -  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). [from Rob Paisley's Model Train web site]
Autopilot: Do it Yourself UAV -  (diagram added 05/06/07)
Auxiliary Throttle Controls -  A variation on the walkaround throttle is in the next circuit. If extra wires are added to the control cable they can be put to use for operating accessories on the layout.  For every extra wire 2 such loads can be controlled. Electromagnetic uncoupling ramps could be turned on and off, train whistles could be blown or a reverse loop switch can be thrown after the train has passed....[from Rob Paisley's Model Train web site]
Average 51.5 % Output Duty Cycle Using A 555 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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