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DiscoverCircuits.com -- Hobby Corner
Last Updated on:
Tuesday, June 01, 2021 03:06 PM
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Model Circuits
Model Train Circuits |
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HO Model Train Lighthouse Flasher
designed
by David Johnson, P.E. (July 7, 2005) |
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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. |
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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 Circuit Below to view PDF of Schematic |
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eMail David A.
Johnson, P.E. about this circuit |
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