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Circuits designed by David Johnson, P.E.
Last Updated on: Thursday, April 07, 2016 02:04 PM

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Model Circuits

HO Model Train 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 rotation . . . [Hobby Circuit designed by David A. Johnson P.E.,  07/11/06]


HO Train Lighthouse Flasher Revisited  -  HO train sets often have authentic looking scale model homes and buildings.  A while back someone asked me to design a flashing LED light, which he could mount inside a model lighthouse and have it operate so it would appear to rotate and flash.  I designed a working circuit but I was never pleased with the results.  Iím still not 100% pleased but the revised circuit below seems to operate a bit better than the older circuit.Ö [Hobby Circuit designed by Dave Johnson P.E., May 2012] . . . [Hobby Circuit designed by Dave Johnson P.E.,  12/20/12]
 

LED Lighthouse Flasher for HO Model Train   -  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 rotation . . . [Hobby Circuit designed by David Johnson P.E.,  07/11/06]


Lighthouse LED Flasher  -  This was originally designed for a model in a HO train set.  It simulates the behavior of the light from a lighthouse.  The LED intensity gradually increases, then flashes with a bright light and finally decreases slowly in intensity . . . [Circuit by Dave Johnson P.E.,  07/11/06]


Miniature Lighthouse Light Simulator  -  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 . . . [Circuit Solution by David Johnson P.E.,  05/07/06]


Model Train Lighthouse Flasher  -  HO train sets often have authentic looking scale model homes and buildings.  A while back someone asked me to design a flashing LED light, which he could mount inside a model lighthouse and have it operate so it would appear to rotate and flash.  I designed a working circuit but I was never pleased with the results.  Iím still not 100% pleased but the revised circuit below seems to operate a bit better than the older circuit.Ö [Hobby Circuit designed by Dave Johnson P.E., May 2012] . . . [Hobby Circuit designed by David Johnson P.E.,  12/20/12]


Model Train Lighthouse Flasher Revisited  -  This was originally designed for a model in a HO train set.  It simulates the behavior of the light from a lighthouse.  The LED intensity gradually increases, then flashes with a bright light and finally decreases slowly in intensity . . . [Hobby Circuit designed by David Johnson P.E.,  07/12/06]


Revisited-Model Train Lighthouse Flasher  -  This was originally designed for a model in a HO train set.  It simulates the behavior of the light from a lighthouse.  The LED intensity gradually increases, then flashes with a bright light and finally decreases slowly in intensity . . . [Hobby Circuit designed by David A. Johnson P.E.,  07/12/06]

 


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