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D - 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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Day & Night 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] |
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DC Motor Pulse Width Modulation Speed Control - This is a circuit
for controlling the speed of small DC motors, it works nicely as a speed
controller for an HO or N gauge model railroad. (electronic diagram added
11/06) |
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DCC Ammeter (ZXCT1009) - The circuit shown on this page allows
inexpensive digital multimeters to measure currents in DCC systems. The 2010
circuit is designed to use a 20 milliamp DC milliammeter to monitor the
current but other types of meters could also be used with this circuit.
[from Rob Paisley's Model Train web site] |
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DCC Booster - The DCC booster shown on this page uses the LMD18200
motor driver H-bridge IC. The booster's designed output rating is 3 amps at
15 volts. [from Rob Paisley's Model Train web site] |
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DCC To DC - Accessory Power Supplies - Circuit for model railroad trains….
[from Rob Paisley's Model Train web site] |
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DCC To DC Power Supplies For Accessory Circuits - Circuit for model railroad
trains…. [from Rob Paisley's Model Train web site] |
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DCC Waveforms and Voltage - This page attempts to show the voltage waveforms
associated with model railroad DCC systems as they would be seen with an oscilloscope.
Also methods of measuring DCC system voltages and currents are shown. [from Rob
Paisley's Model Train web site] |
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DCC Zero Stretching Simulator (LM555) - This circuit is designed to simulate
the 'Zero Stretching' function of Digital Command Control systems used by model
railroads. This circuit was used drive the booster while testing the operation of
block occupancy detectors and DCC signal failure circuits while in the zero stretching
mode....[from Rob Paisley's Model Train web site] |
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Delayed Re-Triggering - 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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Detection for Day & Night - 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] |
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Diagrams And Schematics For My MiniDCC© System - This page shows schematics
and diagrams for a MiniDCC© system that was built for my personal use. [from Rob
Paisley's Model Train web site] |
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Diode Matrix Systems for Stall Motor Switch Machines - 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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Diode Type Constant Lighting Circuits - Circuit for model railroad trains….
[from Rob Paisley's Model Train web site] |
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Discrete Version Of The LM3909 Oscillator IC - 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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Driving Loads Of Greater Than 15 Volts - 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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Dual-Transformer Type Block Occupancy Detector-VT-5 - This block occupancy
detection circuit uses a current sense transformer to isolate the detector circuit
from the track power circuit. The output section of the circuit takes its power from
an external power supply and uses a LM555 timer to provide the release time delay and
both an Open Collector and Bipolar output each detector. [from Rob Paisley's Model
Train web site] |
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Electronic Circuit Breakers - The circuit breakers on this page make use of
the Zetex ZXCT-1009 "High Side Current Monitor' integrated circuit. The circuits have
variable trip current settings and are designed for low current applications. Two
circuit breaker designs are shown; The first has its power isolation device on the Low
or common side of the circuit while the second has it isolation device on the High or
supply side of the circuit. Both designs use MOSFET isolation devices. [from Rob
Paisley's Model Train web site] |
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Electronic Time Constant Control - 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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Experimental and Test Throttles - This page will show a number of variations
on transistor type throttles. The throttles range from 'tried and true' types to
'experimental' designs. Scroll to this one…. [from Rob Paisley's Model Train web
site] |
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