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DiscoverCircuits.com -- Hobby Corner
"Hobby Circuits for
your Hobby Projects"
Last Updated on:
03/22/2010 03:33:55 AM
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HO Train Model 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. |
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Click on Schematic below to view PDF
version of this Circuit |
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