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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] |
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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). |
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RC Servo Motor Test Circuit (LM555) - Circuit for model railroad
trains…. [from Rob Paisley's Model Train web site] |
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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] |
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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] |
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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] |
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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] |
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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] |
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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] |
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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] |
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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] |
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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] |
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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] |
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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] |
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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] |
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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] |
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Signal Breaking module - (electronic circuit added 4/05) |
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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) |
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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] |
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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] |
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Simple Flashing Light Circuit 2 - This project uses parts from Digi-Key…
[Designed by ML Rollins] |
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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] |
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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] |
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Simple train detector using ambient light & a photocell - (electronic
circuit added 4/05) |
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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] |
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Single Traffic Light Driver Circuit - Circuit for model railroad trains….
[from Rob Paisley's Model Train web site] |
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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] |
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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] |
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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] |
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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] |
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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] |
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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] |
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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] |
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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] |
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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] |
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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] |
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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] |
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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] |
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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] |
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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] |
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