SPDX 2018 Speedometer Circuit

  This page has information on speedometer circuit that can be used with scales HO and larger. The circuit could also be used for other short range telemetry purposes.

Objectives For The Speedometer Circuit

  1. The average hobbyist can build the circuit with little difficulty and no special equipment or tools.

  2. Components that can be used for their original design use when not on the layout.

  3. Components that are widely availble and easy to find.

Major component Assemblies

  To make the Speedometer as practical as possible, the two major components are items that can be purchased at sports shops and consumer electronics dealers or online.

  1. A bicycle Speedometer/Odometer* to provide a display of the speed and distance traveled.

  2. A ? ? radio transmitter and reciever to send the information to the readout device.

  * - Any bicycle speedometer that uses a magnet and reed switch to sense rotation of the wheel can be used with this circuit.

  When not on the layout, the bicycle speedometer can be used on a bicycle. The magnet and reed switch can be left on the bike if a plug and jack are used to disconnect them. Also, the display's mounting hardware can be left on the bike if not needed for the train's speedometer circuit.

  When not on the layout, the reciever and transmitter can be used for their design use of transmitting music wirelessly.

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Please Read Before Using These Circuit Ideas

  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.

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18 July, 2018