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Day & Night Infrared Detection - (circuit design added 8/03) |
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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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DC/AC inverter (rpaisley) - The circuit shown on this page is a reasonably Low
Cost, Hi-Tech ammeter that can be used with DCC systems. The circuit's meter output is
always has the same polarity regardless of the input polarity. This allows a low cost
DC voltmeter or milliammeter to be used to monitor a DCC current....(added 04/05/06) |
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Diode Matrix Systems for Stall Motor Switch Machines - (electronic circuit added
7/03) |
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Diode Type Constant Lighting Circuits - (diagram added 2/07) |
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Dual-Transformer Type Block Occupancy Detector-VT-5 - Each circuit board has 2
complete detectors, each using one-half of a 556 timer IC to provide the release time
delay and outputs. Each detector has an Open Collector and a Bipolar output…(added
04/05/06) |
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Electronic Circuit Breakers Information - 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. |
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Files For The Original MiniDCC© System - The home page for the MiniDCC© system can
be found at the following link. Questions about the operation of the MiniDCC©
controller should be sent to the site in the following link…(added 04/05/06) |
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Flashing Rear End Devicefor DCC Systems - (electronic circuit added 7/03) |
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Flashing Rear-End Device information - This circuit is for a "F.R.E.D." that is
designed to be used with DCC control systems. The circuit is based on the LM555 timer
chip. Two versions of the circuit are shown. The first uses a full wave supply
while the second uses a half wave supply. Both should work equally well. (added
07/07/07) |
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General Purpose Block Occupancy Detector - Block occupancy detector designed for
general purpose use on systems where the polarity of the power to the model train
track is reversible. (added 7/03) |
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General Purpose Block Occupancy Detector information - This page presents block
occupancy detector designed for general purpose use on systems where the polarity of
the power to the track is reversible….(added 07/07/07) |
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H Bridge Motor Control Circuits - This page features H-Bridge circuits used for
controlling direct current motors. Several designs are shown using both CMOS and
Bi-Polar power devices….(added 04/05/06) |
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H-Bridge Direct Current Motor Control Circuits - (electronic circuit added 7/03) |
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H-Bridge information - This page features H-Bridge circuits used for controlling
direct current motors. Several designs are shown…..(electronic design added 02/03/04) |
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High Current Crossing Light Flasher LM556 - (electronic circuit added 7/03) |
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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. ….(designed by David A. Johnson) |
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Incline Railway Control Circuit - (electronic circuit added 4/05) |
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Infrared Transmitter for Locomotives -
(electronic circuit added 4/05) |
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IR Proximity Detector Information - The circuits on this page are for an Infrared,
Proximity Detector using the Vishay Electronics, TSOP4830 "IR Receiver Modules for
Remote Control Systems".(circuit design added 04/05/06) |
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Joy Stick Controlled Throttle information - This version was specifically design
to be used by a handicapped person and is controlled by a single axis joy stick that
operates microswitches at each end of its arc of travel….(08/08/08) |
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Knightrider lights for model cars - This simple circuit drives 6 LEDs in 'Knightrider
scanner mode'. Power consumption depends mainly on the type of LEDs used if you use a
7555 (555 CMOS version). (electronic circuit added 11/06) |
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L.M.R.G. Incline Railway System - 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…(08/08/08) |
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Laser Pointer Train Detector - This train detector makes use of hand held laser
pointer devices that are widely available to detect trains over long
distances.(electronic circuit added 7/03) |
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LED Traffic Lights - The LED traffic Light circuit controls 6 LEDs (red, yellow
and green) for both north/south directions and east/west directions. The timing
sequence is generated using a CMOS 4017 decade counter and a 555 timer. Counter
outputs 1 through 4 are wire ORed using 4 diodes so that the (Red, North/South) and
(Green, East/West) LEDs will be on during(electronic circuit added 4/05) |
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LED-Current Limiting Resistor Calculator - The calculators on this page can be
used to find current limiting resistors and currents for Light Emitting Diodes.
(04/05/06 |
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LEGO® RCX Brick Rechargeable Battery Tester - The ciruit on this page is for a
rechargeable battery tester using a LEGO® RCX Brick to gather voltage verses time data
and then upload the data to a PC using the ROBOLAB Software….(added 05/05/05) |
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LEGO® RCX Brick Voltage Recorder - The images shown on this page show circuits
that can used to measure and record with a LEGO® RCX Brick that comes with the LEGO®
MINDSTORMS and LEGO® ROBOLAB robotics sets…(added 05/05/05) |
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Level Crossing Lights - Every model railway has a place where road and rail meet,
and when it does, some form of warning is needed. Flashing lights work well, but
something is needed to drive them. And that is where this circuit comes in. All it
does is flash lights and it is so simple anyone could build it!...(design added 10/06) |
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LM3909 replacement information
- 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.….(electronic design added 02/03/04) |
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LM555 Timer information - Also on this page are calculators that will give the
output times of LM555 timers for a given set of component values. (electronic diagram
added 06/07/08) |
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Low Power Crossing Light Flashers LM556 E+F - (electronic circuit added 7/03) |
