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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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