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Model Circuits
Model Airplane Circuits     Model Train Circuits
Models:  #'s - B        C - G      H - L      M - Q      R - S      T - Z

Last Updated: October 24, 2017 02:55 PM

Circuits Designed by Dave Johnson, P.E. :

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.-July, 2006

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.    Im still not 100% pleased but the revised circuit below seems to operate a bit better than the older circuit.  [ . . . Hobby Circuit designed by Dave Johnson P.  E.  , May 2012] . . . Hobby Circuit designed by Dave Johnson P.E.-December, 2012

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.-July, 2006

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.-July, 2006


Links to electronic circuits, electronic schematics, designs for engineers, hobbyists, students & inventors:

Hack-Toy Car -  This car measures just 5 1/2 inches in length.  It was sold as a remote control car for $19.95 at Fry's Electronics here in Phoenix.  Powered by 4 AAA batteries, it has a small dc motor and a very interesting steering mechanism.   (08/08/08)  __ Designed by Luhan Monat - Mesa Arizona

High Speed NiCd Charger for Electric R/C -  A few years back, I published a design for a Low Cost Thermal Peak Detection Charger.  Since then, I've designed several other chargers, in my ongoing quest to avoid having to spend money.  Of course, in building all these designs, I've probably spent more than a really good commercial charger would have cost me.  But designing and building is half the fun __ Designed by Stefan Vorketter

High-Rate Electronic Speed Control with BEC & Brake -  This electronic speed control  (ESC) for brushed motors combines the features of two of my earlier designs.  One was a high-rate 30A ESC with a brake, and the other a high-rate 12A ESC with a BEC  (receiver battery eliminator circuit) .   __ Designed by Stefan Vorketter

High-Rate Speed Control with Brake -  Many designs for high-rate speed controls have been published.  Most require two 8-pin integrated circuits    (ICs) or one 14-pin IC.  Many designs suitable for home construction are fairly large    (some as large as 2" square) .  Many do not include a brake __ Designed by Stefan Vorketter

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.-July, 2006

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.    Im still not 100% pleased but the revised circuit below seems to operate a bit better than the older circuit.  [ . . . Hobby Circuit designed by Dave Johnson P.  E.  , May 2012] . . . Hobby Circuit designed by Dave Johnson P.E.-December, 2012

Homemade stuff RC related -  Planes, Cars, Boats, electronics, radiocontrol, wireless video, on screen display __ Designed by Thomas Scherrer OZ2CPU

Hot Wire Foam Cutter -  Here is a homebuilt foam turning lathe!!This is made from a window motor adapted and appropriately painted for the application.  The pillow blocks that the rotating shaft bear in were made from foam patterns and cast using the above mentioned techniques.  The two dials on the electrical box are light dimmers with simple  __ Designed by Damon Kohler

Hot-Wire Foam Cutter -  Hot wire foam cutters are a must when working with polystyrene foam because they make neat, straight and smooth cuts that simply cannot be duplicated with any other type of saw.  Most cutters are hand-held devices looking much like a cheese cutter without the roller and operate a bit like a jig saw.  The foam cutter described  __ Contact: Charles Wenzel of Wenzel Associates, Inc.

Hot-Wire-Foam Cutter -  Transformer T1 rectifies the 18 to 22 Volts AC via the bridge rectifier  (BR1) to about 26 or 32 Volts DC.  T1 is a regular type without "CT" or center-tap.  If your transformer is above 22VAC, you need to modify the circuit to protect the LM350K from over-voltage  (33V max) .  Check the datasheet for more info __ Designed by Tony van Roon  VA3AVR

Infra Red Switch -  ASCII Drawing __ Contact: IQ Technologies

Infra Red Switch -  This is a single channel  (on / off) universal switch that may be used with any Infra Red remote control using 36-38kHz.   (This is a very common remote handset frequency) .  In place of IR1 a TSOP1738 receiver may be used.     __ Designed by Andy Collison

Infrared Remote Control -  This circuit will allow you to turn on any piece of equipment that operates on 115 volts ac.  The receiver circuit is based on the Radio Shack infrared receiver module  (MOD) , part number 276-137.  It is also.   __ Designed by Randy Linscott

Infrared Toy Car Motor Controller -  This add-on circuit enables remote switching on/off of battery-operated toy cars with the help of a TV/ video remote control handset operating at 3040 kHz.  When the circuit is energised from a...__ Electronics Projects for You

Javabot -  I have designed it just for fun.  First I want to know how the line sensor work.  I used comparator IC using LM339, two H-bridge sensor using eight transistors, FCS9013, and four transistors, FSC 9012.  For the sensor you can use LED and LDR as the light receiver.  I changed the LDR sensor to IR sensor.  I built this robot using only the analog comparator and IR sensor, no microcontroller.  This is smart idea and very cheap approach __ Designed by Wichit Sirichote

Knightrider lights for Model cars -  This simple circuit drives 6 LEDs in 'Knightrider scanner mode'.  Power consumption depends mainly on the type of LEDs used if you use a 7555  (555 CMOS version) . __ Contact: IQ Technologies

LED Bargraph Optical Tachometer -  For the electric R/C enthusiast, a tachometer can be a very useful piece of equipment.  When I first built this tach back in 1995, it was essential, as there were very few off-the-shelf electric R/C power systems that just worked.   __ Designed by Stefan Vorketter

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.-July, 2006

LED Strobe Light -  Schematic + Info + pictures __ Designed by Lennie Zink

LED Traffic Lights -  The LED traffic Light circuit controls 6 LEDs  (red, yellow and green) for both north/south directions and east/west directions.  The timing sequence is generated using a CMOS 4017 decade counter and a 555 timer.  Counter outputs 1 through 4 are wire ORed using 4 diodes so that the  (Red, North/South) and  (Green, East/West) LEDs will be on during __ Designed by Bill Bowden

Lego compatible, compact rotation sensor -  This rotation sensor is based on a Bourns 3315 mechanical quadrature encoder.  The small size of this encoder makes possible to cram the entire rotation sensor in a hollowed 2x3 brick  (Bourns makes an even smaller device, referenced 3375 - see the Acrobat datasheet- but I couln't get one) .  It is also cheap, about $2. __ Designed by Philippe "Philo"Hurbain

Lego Mindstorms RCX IRPD Interface -  Several Projects, scroll down.  Long have I wanted to get a better proximity detector for my Mindstorms robots, now I have one.  When I found the Lite-On IR modules and the new Sharp IS1U60's it looked like a match made in heaven.  However, these newer, smaller units are more sensitive and far more picky.  I had to re-write my code to get them to work well and try to cut down on their sensitivity.  The PIC program I used for this project has the exact same code as that in my IRPD project above, it just requires more "hits" to go over the sense threshhold because this IR demodulator is so much more sensitive____ Designed by Dennis Clark

Level Crossing Lights -  Every model railway has a place where road and rail meet, and when it does, some form of warning is needed.  Flashing lights work well, but something is needed to drive them.  And that is where this circuit comes in.  All it does is flash lights and it is so simple anyone could build it! __ Contact: Collin Mitchell

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.-July, 2006

Lights Control for Model Cars -  NOTE : Must register on this site __ Designed by Published in Elecktor July/Aug, 2010

L'il Pulser Train Controller -  Here's a pulse-power train controller that's cheap and easy to build.  It works from any standard 12V model train supply.__ SiliconChip

Locomotive signal braking Module -  Brake modules are electronic circuits that let locos with digital decoder brake smoothly on a section of track.  The brake module generates a brake voltage to be fed to the track that is interpreted by suitable loco decoders, which then smoothly brake the loco.  The brake voltage is basically just negative dc, but on the bogobit brake modules  (except for the standard brake module) combined with a tailored current limit protection to avoid critical short circuits. __ Designed by Manfred Boehmel

Low Cost Thermal Peak Detection Charger -  The electric model aircraft and car industries have produced a bewildering array of field chargers for NiCd motor battery packs.  These range from simple 6 or 7 cell chargers consisting of a resistor and mechanical timer, to more complex chargers with peak detection, cycling, and the ability __ Designed by Stefan Vorketter


Models:  #'s - B        C - G      H - L      M - Q      R - S      T - Z

 


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