Adding External Meters to DC Throttles

  Typical analog meters must be added before the reversing switch. 'Centre zero' meters can be connected after the reversing switch.

  Digital meters could easily be added to the output of a DC throttle so that they indicate, volts, current and polarity of the output.

  Many digital multimeters are less expensive than analog meters and often easier to find locallys.

  Each digital meter must have its own battery or short circuits/sneak current paths will be created between the meters wich could dammage the meters or give false readings.

  The battery for the digital multimeters could also be switched by an optoisolator powered from the pack's auxiliary output so that the meters are turned off when the thottle is off.

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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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22 January, 2009.