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