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Last Updated on: Monday, August 18, 2014 04:34 AM

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More  Model Circuits     Model Train Circuits

HO Model Train Lighthouse Flasher
designed by David Johnson, P.E.

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.
The first device forms a classic oscillator circuit whose output is both a triangle waveform signal and a square wave signal.  The triangle signal is routed to a current regulator circuit, which converts the triangle voltage signal to a triangle current signal through the lighthouse LED.  The square wave signal is first sent through a capacitor then to a power FET transistor.  This produces a high current pulse through the LED, with the right timing to produce a strobe effect.  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.

Click on Drawing Below to view PDF version of Schematic

Circuit Lighthouse Flasher Circuit designed by David A. Johnson, P.E. (July 7, 2005)

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