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DiscoverCircuits.com
-- Hobby Corner
Last Updated on:
03/19/2008 06:54:11 AM |
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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. 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. |
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Click on Drawing to view PDF |
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