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Matrix Systems For Stall-Motor Switch Machines information - The driver circuits
themselves use LM556 dual timer chips to reverse the polarity of the voltage to the
switch machine motors. |
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Miniature Lighthouse Light Simulator - The circuit I came up with is shown below.
It uses two dual low power op amps. The first two devices form a classic oscillator
circuit whose output is a triangle waveform signal. That signal is routed to a
current regulator circuit, which converts the triangle voltage signal to a triangle
current signal through the lighthouse LED. A third op amp generates pulses timed so
they occur at the peak of the triangle waveform. The result is a LED, which gradually
grows brighter, then flashes even brighter before dimming again. This should produce a
light, which simulates a rotating lighthouse light. ….(designed by David A. Johnson) |
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MiniDCC© System - This page shows schematics and diagrams for a MiniDCC© system
that was built for my personal use…..(added 07/07/07) |
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MiniDCC© System information - This page features schematics and diagrams that are
for use with the MiniDCC© system., A DCC ( Digital Command Control) do-it-yourself
project.... |
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Miscellaneous Signals information - Some simple signals circuits that do not have
pages of their own. |
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Model Railroad Odometer Car (1994 M.R. Magazine article) - This page features a
photo and schematic from an article that was published in the August 1994 issue of
Model Railroader Magazine. The article was titled "Build a model railroad odometer
car". The Car shows the distance a train travels on a 5 digit LCD display. The
distance is indicated down to 1/100th of a mile (about the length of a 50 foot car)
with an accuracy of approximately plus 2 percent using a standard 33 inch freight car
wheel....(schematic added 06/07/08) |
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Model Railway Level Crossing Lights - The level crossing warning lights are
switched on automatically as a train approaches. First an amber light shows, then two
red lights flash until the train has passed the crossing.....Designed by John Hewes
(circuit added 06/07/08) |
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Model Railway Signal - This signal is controlled automatically by a passing train
fitted with a magnet. It can also be manually set to red or green by pressing the
switches. Trains will automatically stop at the red signal.....Designed by John Hewes
(circuit added 06/07/08) |
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Model Train Diesel & Horn Sound Module - TIL 112 opto isolator, 741, LM566 VCO,
CD4017 CMOS counter, LM386 power amplifier, LM556 dual timer (circuit added 9/04) |
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My MiniDCC© System information - This page shows schematics and diagrams for a
MiniDCC© system that was built for my personal use. |
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Not as Simple Signals - (electronic circuit added 7/03) |
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Occupancy Detector Information - In these circuits a transformer is used to
isolate the detector circuitry from the track power circuit. |
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Optoisolator Block Occupancy Detector - (electronic circuit added 7/03) |
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Optoisolator Block Occupancy Detector information - This page is about a block
occupancy detector that uses an optoisolator to electrically separate the track from
the detector output. Four variations of the detector are shown. |
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Photo Detector Circuits (E+F) - This page features basic, visible light
photo-detector circuits that can be used to detect trains. These methods would
normally be used with the photo sensor mounted between the rails. The sensors used
are silicon phototransistors and Cadmium Sulfide (CdS) photocells. Both of these
sensors ..(schematic added 06/07/08) |
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Push-In Terminals information - This page shows a less expensive alternative to
screw type terminal blocks for use on printed circuit boards. These are described as
"Push-In Terminals for 0.042" Dia. Holes" and require soldering of external
connections. |
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Quadruple & Octuple Infrared-Proximity Detectors - (schematic added 05/08) |
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Rail Crossing Diamond Protection - (electronic circuit added 7/03) |
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Rail Crossing Diamond Protection Circuits - The Crossing Diamond Protection
circuits are designed to prevent collisions where one rail line crosses another. Using
transformer type BODs or phototransistor sensors to detect a train, the circuits will
disconnect the track power from the line that crosses the occupied line....(circuit
design added 05/08) |
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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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Regulated Power Supply Circuits - The circuits on this page are for various type
of voltage regulated power supplies. |
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Replacement For The LM3909 LED Flasher/ Oscillator - This page features a
replacement circuit for the LM3909 LED Flasher / Oscillator using discrete components.
The circuit is functionally the same as the integrated LM3909 but has a minor
variations in values of the components used.....(electronic design 08/08/08) |
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Route Control for Stall Motor Switch Machines - (electronic circuit added 7/03) |
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Route Control information - 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 transistors to select the routes. |
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Sequencing Circuit Information - 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. |
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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. (added 2/05) |
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Simple Signal Circuits - (electronic circuit added 7/03) |
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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. |
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Simple train detector using ambient light & a photocell - (electronic circuit
added 4/05) |
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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 output
t....(added 06/07/08) |
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Stall Motor Switch Machine Circuits - (electronic circuit added 7/03) |
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Stall Motor Switch Machine Circuits information - Some power supply and control
options for Stall-Motor switch machines |
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Stall Motor Switch Machine Drivers LM556 - (electronic circuit added 7/03) |
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Stall Motor Switch Machine Automatic Reversing Loop Circuit - (electronic
circuit added 7/03) |
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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. (electronic design added
06/07/08) |
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Substitution Box information - 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. |
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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. |
