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Circuits designed by David Johnson, P.E.
Last Updated on: Monday, July 11, 2016 01:59 PM

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Train Model Circuits

  • HO Train Model Lighthouse Flasher
    HO train sets often have authentic looking scale model homes and buildings.  The hobby circuit below can be mounted inside a model lighthouse.  The electronic circuit drives a single LED lamp in such a way that it produces light which simulates the rotating light from a lighthouse beacon.  It uses a dual low power op Amp IC.
  • Miniature Lighthouse Light Simulator -  The circuit I came up with is shown below.  It uses two dual low power op Amps.  The first two devices form a classic oscillator circuit whose output is a triangle waveform signal.  That signal is routed to a current regulator circuit, which converts the triangle voltage signal to a triangle current signal through the lighthouse LED.  A third op Amp generates pulses timed so they occur at the peak of the triangle waveform.  The result is a LED, which gradually grows brighter, then flashes even brighter before dimming again.  This should produce a light, which simulates a rotating lighthouse light...

  • Visible Light Blocking Filter -  This isnít an electronic circuit but the drawing below shows the curve for an optical filter made from exposed color film. The material blocks most visible light but is very transparent to 880nM infrared light. Kodak 100ASA is exposed to "cool white" fluorescent light for about 5 seconds.Ö.

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The circuits on this site are designed by David A Johnson - unless otherwise noted.  David A. Johnson & Associates.  All Rights reserved. 
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