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0-10V Control for RC Servos - In this circuit NE555 is configured as astable
multivibrator. main timing capacitor (220 nF) is always changed to voltage level
which is determined by voltage on NE555 pin 5 (in this circuit that voltage is aroun
1.6V). When timing capacitor is....(added 08/08/08) |
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2 Tone Train Horn - (Tony van Roon's schematic / circuit added 11/06) |
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2 Watt Switching Power Supply - In this small switching power supply, a Schmitt
trigger oscillator is used to drive a switching transistor that supplies current to a
small inductor. Energy is stored in the inductor while the transistor is on, and
released into the load circuit when the transistor switches off. The output voltage is
dependent on the load resistance and is limited by a zener diode that stops the
oscillator when the voltage reaches about 14 volts. Higher or lower voltages can be
obtained by adjusting the voltage divider that feeds the zener diode. The efficiency
is about 80% using a high Q inductor...(added 6/06) |
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250-Amp Speed Controller for RC Cars - (electronic circuit added 4/05) |
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27MHz superregenerative receiver - for RC model remote control….(circuit design
added 04/09) |
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27MHz toy car receiver - (circuit / schematic design added 05/06/07) |
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27MHz toy car Transmitter - (circuit / schematic design added 05/06/07) |
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A Digital speed control with BEC - A digital speed control with BEC (electronic
design added (11/06) |
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A Dual Alternating Flashing Light Circuit - This project is best for mounting on a
layout to light a crossing or ring a bell. (circuit diagram added 05/06/07) |
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A Dual Tandem Flashing Light Circuit Powered by a 9 Volt Battery - (circuit added
05/06/07) |
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A Low Cost Thermal Peak Detection Charger - The electric model aircraft and car
industries have produced a bewildering array of field chargers for NiCd motor battery
packs. These range from simple 6 or 7 cell chargers consisting of a resistor and
mechanical timer, to more complex chargers with peak detection, cycling, and the
ability to handle 36 cell packs. The resistor/timer type of charger is cheap, but it
is has two drawbacks: it might not fully charge the pack in the allotted time, or it
might overcharge the pack. The more complex chargers have none of these drawbacks, but
they are very expensive.... (diagram added 6/07) |
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A maxi speed control with brake - A "maxi" speed control with brake (circuit added
11/06) |
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A miniature high-rate speed control - A miniature high-rate speed control
published in newsletter published by Electric Model Flyers' of Southwestern Ontario
(diagram add |
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A miniature low-rate speed control - A miniature low-rate speed control published
in newsletter published by Electric Model Flyers' of Southwestern Ontario (diagram
added 11/06) |
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A simple miniature speed control with brake - A simple miniature speed control
with brake (circuit added 11/06) |
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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 comparator chip and can use a wide assortment of matched infrared, emitter /
detector pairs….(diagram added 05/06/07) |
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AN-673: 2-Way Multiplexed LCD Drive & Low Cost A/D-Converter using V/F Techniques with
COP8 MicroControllers - National Semiconductor Application Note (app note added
6/06) |
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AN847: RC Model Aircraft Motor Control - Microchip Application Note Published
18-Jul-02 (app note added 2/06) |
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Analog Bargraph Expanded Scale Voltmeter - (electronic design added 11/06) |
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Angelfire rocket GPS payload - (schematic / circuit added 05/06/07) |
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Animatronic Snake Throat Muscle Controller - (circuit diagram added 05/06/07) |
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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…(circuit
added 05/06/07) |
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Automatic-Railway Grade Crossing - The Grade Crossing circuit uses six, visible
and infrared light sensitive phototransistors to control the operation of the
flashers. The protected section of track can be as long or as short as desired and
does….(circuit added 04/05/06) |
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Autopilot: Do it Yourself UAV - (diagram added 05/06/07) |
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Building a robot arn using Nitino muscle wire - (diagram added 05/06/07) |
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Building an RF Remote Control System -
(diagram added 05/06/07) |
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Capacitor Discharge Power Supplies For Twin Coil Switch Machines - The schematics
on this page have sections that have heavier lines. These lines represent the portions
of the circuit that are subjected to large current surges when the switch machines are
operated. Careful attention to good wiring and soldering techniques should be used for
these sections to ensure good results....(circuit added 08/08/08) |
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Computer Controlled Model Train Set - (electronic circuit added 4/05) |
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Crystal radio circuits including diode performance comparison - The calculators on
this page can be used to find current limiting resistors and currents for Light
Emitting Diodes. The first calculator determines the resistance for a desired LED
current while the second calculates the current for a given resistance. |
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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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DCC Ammeter (ZXCT1009) - 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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DCC-Zero Stretching Simulator LM555 - (schematic / circuit added 05/06/07) |
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Digital Speed Control for RC Car - DC motor PWM controller that takes the1ms to2ms
pulse from the RC receiver and converts it into a PWM train at1Khz (added 6/06) |
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Digital speed control with BEC - A digital speed control with BEC (electronic
design added (11/06) |
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Downed Model Locator - The circuit draws
1mA (!) when idle and 4 mA when buzzing. I've been using large peizo buzzers (see part
numbers below) because they are light and loud, and the 6 volt electromagnetic buzzer
where weight is not so much of a concern..(circuit design added 08/08) |
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Downed Model Locator II - Here is
another device to help you locate your downed R/C sailplane in the bushes and weeds.
Similar to the other design, this circuit plugs into a spare servo socket on your
receiver, and it is a pulse omission detector. The alarm sounds when pulses
originating from your transmitter are no longer being received--turn off your
transmitter to turn on the ….(design added 08/08) |
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Dual Alternating Flashing Light Circuit - (circuit diagram added 05/06/07) |
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Dual Tandem Flashing Light Circuit Powered by a 9 Volt Battery - This circuit is
powered by a 9 volt battery, suitable for warning lights on a tall structure.
(Personally, I can't recommend you buy anything but the Rollins Railroad Designs kit;
for $4.00 you can't go wrong. The 555 IC is about $1.50 by itself at Radio Shack). If
you choose to buy all the parts yourself, realize you need ONLY two LEDs, not two of
each; you should be able to mix and match colors.....(circuit added 05/06/07) |
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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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Electronic NiCad Glow Plug Driver - (circuit / schematic design added 6/06) |
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Electronic Speed Controller for R/C Models - Here's how you can make an electronic
speed controler (ESC) for your remote control car, boat or even an airplane using an
old servo and some MOSFETS…. (electronic design added 11/06) |
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Fast Acting Electronic Circuit Breakers - The circuit breakers on this page make
use of the Zetex, ZXCT1009 "High Side Current Monitor' integrated circuit. The
circuits have variable trip current settings and are designed for low current
applications…(circuit design added 04/05/06) |
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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 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 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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Glowplug Driver a - (Tony van Roon's circuit / schematic design added 6/06) |
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Glowplug Panel b - (Tony van Roon's circuit / schematic design added 6/06) |
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Grouped DCC Block Occupancy Detectors - (diagram added 05/06/07) |
