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Pad launch Controller for model rockets - (electronic circuit added 4/05) |
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Phase Shift Radio Direction Finder - (electronic circuit added 4/05) |
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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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PIC Based rocket altimeter - (electronic circuit added 4/05) |
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Pine Racecar Victory Judge (Aaron Cake) - (electronic circuit added 4/05) |
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Precision Digital Altimeter - The current concept incorporates a wireless
transmitter and receiver and is thought to be used for remote controlled airplanes or
appliances with two seperate parts. In other words, we have one dedicated transmitter
(acquisition, filtering) and one dedicated receiver part (user-interface, look-up
table, calibration, storage), capable of being .... (added 4/05) |
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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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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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RC Model Aircraft Motor Control - Microchip Application Note Published 18-Jul-02
(app note added 2/06) |
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RC model receivers - ….(circuit design added 04/09) |
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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 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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School Bus Signals Circuit - (electronic circuit added 05/06/07) |
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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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Servo Wiring Chart - After 1991 or so (I can't remember), most of the major brands
of servos became compatible with each other. You can use any of these brands of servos
with any brand of receiver. Some brands of servos are really great for a particular
use in a particular plane, and there are other companies that sell their servos with
each different manufacturer's.... (added 2/06) |
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Signal Breaking module - (electronic circuit added 4/05) |
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Signal Circuits - (electronic circuit added 7/03) |
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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 Flashing Light Circuit 1 - (electronic circuit added 4/05) |
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Simple Flashing Light Circuit 2 - (electronic circuit added 4/05) |
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Simple Flashing Light Circuit 3B - (electronic circuit added 4/05) |
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Simple miniature speed control with brake - A simple miniature speed control with
brake (circuit added 11/06) |
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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 throttle control ideal for railway shutting yards or a second main track line
- (schematic / circuit added 05/06/07) |
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Single Chip Builds Tiny Aircraft Receiver - 09/25/97 EDN-Design Ideas: (design
idea added 6/06) |
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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 ....(added
06/07/08) |
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Speed control based on the ZN409 - Speed control based on the ZN409 |
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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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Stall Motor Switch Machine Circuits information - Some power supply and control
options for Stall-Motor switch machines |
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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. |
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Three Terminal Regulator Type Throttle LM350K - (diagram added 08/08/08) |
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Timed DC Throttle - (electronic circuit added 08/08/08) |
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Timed Uncoupling Ramp Driver LM555 - (schematic / circuit added 08/08/08) |
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Toggle Switch Control information - These circuits allow an ON-ON type DPDT toggle
switch to control a twin coil switch machine motor. The handle of switch can then be
used to indicate the route selected. The circuits are also able to control LEDs that
could be used to indicate the selected route....(electronic circuit added 7/03) |
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toy car receiver - ….(design added 04/09) |
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toy car transmitter - ….(electronic schematic added 04/09) |
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Traffic Light Control Circuit (20 Output Sequencing Circuit) - 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…(added 7/03) |
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Traffic Light Controller - controls on3 LED traffic light sequence (added 4/05) |
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Traffic light Controller with 20-output sequencing - (diagram added 08/08/08) |
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Traffic Light Timer - The 555 timer IC is connected for Astable Operation, the
clock pulses are fed to the 4017 IC via the 10K resistor. The 4017 is a 10 stage
counter, therefore the sequence of the traffic lights is spread over 10 clock pulses,
4on red, 1 on red & amber, 4 on green and 1 on amber...(added 6/07) |
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Train Detector using Ambient Light & a Photocell - (electronic circuit added 4/05) |
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Transformer Type-DCC Block Occupancy Detectors - In these circuits a transformer
is used to isolate the detector circuitry from the track power circuit. The circuits
have been designed to use a minimum of parts and to take their operating power from an
external power source supply….(added 05/08) |
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Turnout Anti-Derail Protection - The circuits presented here will prevent turnouts
from being thrown while a train is on a switch, ideal where the switch cannot be seen
by the operator. They use phototransistor sensors to detect the train and have a short
time delay to compensate for gaps between cars. The circuit can also be used to
protect crossovers and ladder tracks with the addition of more sensors....(added
06/07/08) |
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Twin Coil Switch Machine-Automatic Reversing Loop Circuits - This page is about
automatic reversing loop switch machine control circuits for twin coil type switch
motors. The first switch machine controller is very basic. More complicated circuits
follow…(circuit added 06/07/08) |
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Two-Tone Train Horn - With this circuit you can electronically simulate the noise
of a diesel-train horn. The sound is triggered automatically as the train reaches a
desired place on the track so you can produce the sound as the train approaches
stations, level crossings, etc. The circuit can be built simply by using one 556 or
two 555 timers. The rest of the parts are readily available and not critical. The
output...(Tony van Roon's schematic / circuit added 2/07) |
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Versatile Miniature High-Rate ESC with BEC & Brake - electronic diagram added
11/06) |
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Voltage Recorder information - 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…(electronic design added 06/07/08) |
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Wire Coat Hanger Cable Guides (E+F) - Here is a way to use old wire coat hangers
to make simple and efficient wiring harness guides that can help keep your layout
wiring neat and tangle free…(design idea added 05/08) |
