This circuit uses the MiniDCC Booster Page as an automatic reversing circuit. Phototransistors Q1 and Q2 are located at both ends of the shuttle's run.
The circuit does not have any braking action it just reverses the direction of the shuttle. Most DCC decoders have a built in slowing feature when the direction changes.
So that the locomotive does not jerk to as stop and take off in the other direction. This could be fixed by adding a braking feature to the booster's controls.
The throttle switches and keypad still have their normal functions. Although if the accelerate and brake buttons at the same time it will activate the emergency brake. This was an accidental feature but comes in handy when using a MiniDCC walkaround controller.
The Booster circuit has a SPST switch to select either the #3 or #4 inputs for the remote hand held unit.
The explanations for the circuits on these pages cannot hope to cover every situation on every layout. For this reason be prepared to do some experimenting to get the results you want. This is especially true of circuits such as the "Across Track Infrared Detection" circuits and any other circuit that relies on other than direct electronic inputs, such as switches.
If you use any of these circuit ideas, ask your parts supplier for a copy of the manufacturers data sheets for any components that you have not used before. These sheets contain a wealth of data and circuit design information that no electronic or print article could approach and will save time and perhaps damage to the components themselves. These data sheets can often be found on the web site of the device manufacturers.
Although the circuits are functional the pages are not meant to be full descriptions of each circuit but rather as guides for adapting them for use by others. If you have any questions or comments please send them to the email address on the Circuit Index page.
08 December, 2020