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Last Updated On:  Wednesday June 02, 2021

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Miniature Lighthouse Light Simulator (5/7/06)


Design a circuit for HO trains models, which flashes a LED in a manner that duplicates the light from a lighthouse.


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.




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