Alf: The Robotic Matchbox car: 

Capacitor Discharge  Switch Machine Power Supplies (E+F): 

CLONEPAC memory module for Futaba 8UAF/8UAP:  The Futaba 8UAF or 8UAP radio control transmitter has an optional memory module, the DP-16K CAMPac module, that doubles the model storage capacity (to 16 models from 8) and allows you to save programs or transfer programs to another transmitter.  The module can be purchased for about $90-$100 from Tutorials suppliers.

Computer Controlled Model Train Set: 

Deluxe Charge Rate Limiter for Small Capacity NiCad Batteries: 

Downed Model Locator:

Downed Model Locator II: 

Engine code tester: 

Furby reverse-engineered circuit: 

Glow Plug Driver for Model Engines: 

H Bridge Direct Current Motor Control Circuits: 

High Current Crossing Light Flasher (LM556): 

Incline Railway Control Circuit: 

Infra Red Switch: 

Infrared gate (door entry alarm): 

Infrared Remote Control: 

Infrared Switch using any infrared remote Control: 

Infrared Toy Car Motor Controller: 

Infrared Transmitter for Locomotives: 

Joy Stick Controlled   Modernized Toy Throttle: 

Laser Pointer Train Detector:

Launch Controller for multiple rockets: 

LED traffic lights: 

Low Power Crossing Light Flashers (LM556) (E+F):

Low Tech DCC Meters: 

Low-cost IR data link Controls model train:  03/22/99 Electronic Design - Ideas for Design / For low-speed local data transfer, it’s tough to beat the simplicity of an IR link, which is so common in TV remote controls. This circuit idea combines a transmitter/receiver pair with low-cost. . .

Model rocket launch Controller: 

Model Rocket With Video Camera: 

Model Train Diesel & Horn Sound Module: 

Multi Launcher for Model Rockets: 

Multi Rocket Launcher: 

Not As Simple Signals: 

One IC 2 Tones Siren Double Tone Police Sound Single Tone Old Ambulance Sound:  This circuit is intended for children fun, and is suitable to be installed on bicycles, battery powered cars and motorcycles, but also in models and other games. With SW1 positioned as shown in the circuit diagram it reproduces the typical dual tone sound of Police or Fire-brigade cars, by the oscillation of IC1A and IC1B gates.

One ounce rocket ejection timer: 

One-IC two-tones Siren:  This circuit is intended for children fun, and is suitable to be installed on bicycles, battery powered cars and motorcycles, but also in models and other games. With SW1 positioned as shown in the circuit diagram it reproduces the typical dual tone sound of Police or Fire-brigade cars, by the oscillation of IC1A and IC1B gates.

Optoisolator Block Occupancy Detector: 

Pad launch Controller for model rockets: 

Phase Shift Radio Direction Finder: 

PIC Based rocket altimeter: 

Pine Racecar Victory Judge: 

Pinewood Derby logic: 

Plane Locator Beeper: 

Plane Locator Beeper #2:  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 alarm and help you find your plane.  This circuit is simpler than the other design, is much easier to build, but is not quite as specific.  While the other design tests for a specific frequency of pulses, this design is less picky, and may not work quite as well in areas with more radio frequency background noise..

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 connected together with any physical layer, e.g. wired, wireless, infrared. If you want to build a standalone altimeter/variometer just for hiking or mountaineering, this setup can obviously be simplified by omitting the wireless components..

Signal Breaking module: 

Traffic Light Control Circuit (74145): 

Traffic Light Controller:  controls on3 LED traffic light sequence

Train Electrical system 1:  H0 and N

Train Electrical system 2:  for three coaches, H0 and N.

Train Electrical system 3:  Railcar Electrical system