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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] |
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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 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] |
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Across The Track Infrared Detectors - This page presents
information on infrared - 'Across The Track' train detection circuits. The
circuits are designed around the LM339 quad comparator chip and can use a
wide assortment of matched infrared - emitter / detector pairs..…be sure to
scroll down to view all the circuits....[from Rob Paisley's Model Train web
site] |
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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] |
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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] |
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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] |
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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] |
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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] |
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Automatic Grade Crossing Flasher Circuit - 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] |
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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] |
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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] |
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Automatic Railway 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.
[from Rob Paisley's Model Train web site] |
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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] |
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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] |
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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] |
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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] |
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Automatic Reversing Loop Circuits - 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] |
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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] |
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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] |
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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] |
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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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