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Model Circuits
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Last Updated: October 18, 2017 05:04 AM


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

1 IC 2 Tones Siren Double Tone Police Sound Single Tone Old AM bulance Sound -  This circuit is intended for children fun, and is suitable to be installed on bicycles, battery powered cars and motorcycles, but also in models and other games.  With SW1 positioned as shown in the circuit diagram it reproduces the typical dual tone sound of Police __ Contact: Flavio Dellepiane, fladello @ tin.it

1 Wire Barometer -  By using a dual voltage supply, instrument precision and/or instrument range can be improved without adding significantly to the parts count.   __ Designed by A.G. Miller

1.5 Volt 1970's Style Caboose Marker Flashing Red LED Light -  A circuit that drives a red LED from a 1.5 volt battery and simulates an incandescent light.  Duty cycle can be changed by selecting resistor values __ Designed by Dick Cappels

10A DCC Booster for Model Railways -  Most DCC base stations have puny current capabilities which are exposed if you want to run more than a few locos and peripherals on your model railway layout.  Problem is, DCC boosters are expensive, with a well-known 5A booster costing over $200.  Problem no longer; build this 10A beauty at a fraction of the cost.__ SiliconChip

12C508 IR Obstruction Detector -  Several Projects, scroll down.  This project is inspired by the DPRG IRPROX project.  They have a pretty good PCB layout and idea.  I would like to thank them for posting their project for all of us to see and learn from, I wouldn't have started PIC programming without them, or at least not nearly as quickly come up to speed! The pinout on my board allows either a five-wire or a four-wire connection to be made the former uses a disable line if desired.   __ Designed by dlc @ verinet.com

1-Chip Builds Tiny Aircraft Receiver -  09/25/97 EDN-Design Ideas - It's easy to become bored spending time in airports.  After all, you can do only so much work on a notebook computer with no reference material around.  So, relax and have some fun at the airport--build the tiny, single-chip, aircraft-band radio in __ Circuit Design by Steve Hageman, Hewlett-Packard, Santa Rosa, CA

2 Tone Siren -  This circuit is intended for children fun, and is suitable to be installed on bicycles, battery powered cars and motorcycles, but also in models and other games.  With SW1 positioned as shown in the circuit diagram it reproduces the typical dual tone sound of Police __ Contact: Flavio Dellepiane, fladello @ tin.it

2 Tone Train Horn -  With this circuit you can electronically simulate the noise of a diesel-train horn.  The sound is triggered automatically as the train reaches a desired place on the track so you can produce the sound as the train approaches stations, level crossings, etc.  The circuit can be built simply by using one 556 or two 555 timers __ Designed by Tony van Roon  VA3AVR

2 Watt Switching Power Supply -  In this small switching power supply, a Schmitt trigger oscillator is used to drive a switching transistor that supplies current to a small inductor.  Energy is stored in the inductor while the transistor is on, and released into the load circuit when the transistor switches off.  The output voltage is dependent on the load resistance and is limited by a zener diode that stops the oscillator when the voltage reaches about 14 volts.  Higher or lower voltages can be obtained by adjusting the voltage divider that feeds the zener diode.  The efficiency is about 80% using a high Q inductor.   __ Designed by Bill Bowden

250-Amp Speed Controller for RC Cars -  Radio Controlled cars have increased in popularity from the time when they were first introduced.  Initially, they were little more than toys.  Now they have matured to an international sport.   __ Designed by Collin Mitchell

27MHz superregenerative receiver -  for RC model remote control.   __ Designed by Peter Jakab

27MHz toy car receiver -  RF circuits are not easy to build.  The purpose of this page is to make the circuit diagrams available for educational purposes.  I won't be able to help you contructing them or give more info than what is written on this page.   __ Designed by Peter Jakab

27MHz toy car receiver L4=9 turns, .15mm wire on 4.5mm diameter tunable ferrite coil former -  Schematic only __ Designed by Peter Jakab

27MHz toy car Transmitter -  schematic only, L1=same as L4, L2=15 turns, .5mm wire, 5mm diameter, L3=3.5 turns, .5mm wire, 5mm diameter] __ Designed by Peter Jakab

35kHz Magnetic-Radiation Remote-Control -  Short-range 35KHz operation, single-channel units; Simple circuitry, no outer antennas required __ Contact: Flavio Dellepiane, fladello @ tin.it

50 Amp Model Motor Speed Controller-with Brake -  It fits in a tiny plastic case, can handle motor currents up to 50A and is compatible with existing radio control gear.__ SiliconChip

555 Based Switch for R/C receivers can be used without loss of R/C channels -  That's my hand drawn attempt at a schematic, note that R12 and LED1 are for testing and an be ignored    (unless you want an LED, also the two R12 values are for 12V/6V operation) .  Click on the image for the full size version    (don't worry, it's only 27Kb) .  Or if you still can't tell it from an ink blot, here's an image of the schematic I did in LTspice. __ Designed by Kevin Koster

9V Backup Power for R/C Aircraft -  For Large Aircraft __ Designed by Tony van Roon  VA3AVR

A Dual Alternating Flashing Light -  This project is best for mounting on a layout to light a crossing or ring a bell.   __ Designed by ML Rollins

A Dual Tandem Flashing Light-Powered by a 9 Volt Battery -  This circuit is powered by a 9 volt battery, suitable for warning lights on a tall structure.     (Personally, I can't recommend you buy anything but the Rollins Railroad Designs kit; for $4.00 you can't go wrong.  The 555 IC is about $1.50 by itself at Radio Shack) .  If you choose to buy all the parts yourself, realize you need ONLY two LEDs, not two of each; you should be able to mix and match colors.   __ Designed by ML Rollins

A Futuristic Twist on Model Trains -  24-May-11 -Design News:   For those who love model trains, here's a peek at the future - a solar-augmented monorail.  Joe Kopacz and his brother Justin created the monorail from scratch.  Joe, a mechanical engineer at Colorado State University, created the gadget for a school contest.  The monorail includes break regeneration __ Gadget Freak-Case #187

A 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

A Low Cost Thermal Peak Detection NiCd 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 to handle 36 cell packs __ Designed by Stefan Vorketter

A Miniature 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

A Receive Signal Decoder -  The signal output byradio control receiver is a form of PWM.  This may be useful for driving servos, but is inconvenient for general electronic applications.  Therefore, several of circuits on this site convert this signal into a voltage first.  This is performed by this circuit.  It is not a project in its own right, just a building block used by or projects __ Designed by Paul Hill

A selection of robotICs projects -  I volunteered to turn a friend of mine's Warhammer 40K Imperial Rhino personel carrier into a remote controlled item.  Little did I understand the undertaking that I had agreed on! My requirements for this project were that the transmitter and receiver had to be a single chip design, done all in software.  I succeeded.  The receiver chip uses a Panasonic 4602 38KHz receiver and that's it for external components.  It has the serial input    (GP3) , two RC hobby servo outputs    (GP0/GP1) and three digital outputs    (GP2,4,5) .   __ Designed by dlc @ verinet.com

A Spiffy Face-Lift for an Old-Time Toy -  January 05, 2009 - Luis Fernando Espinal Ceballos of Colombia wanted to give his cousin's son the slot track racing set he loved as a child.  But the toy seemed unbearably old-fashioned.  So Luis jazzed it up with a new electronic control system.  He dumped the old battery box and replaced it with a used PC power supply and rewired the entire system for tighter control.  He also added a lap counter to the circuit and upgraded the cars from old Lotus models to new Porsche and BMW models. __ Gadget Freak-Case #132

Acceleration Sensing-gesture controllers for robotic musical instruments -  This project describes a simple application of the two dimensional accelerometer chips ADXL202, produced by Analog Devices, in combination with an ARM microprocessor    (LPC2103) to produce a midi data stream.     (1)  __ Designed by Dr.Godfried-Willem Raes

Alternating Flashing Light -  This project is best for mounting on a layout to light a crossing or ring a bell.   __ Designed by ML Rollins

An IR Encoder/Decoder paIR made with PIC12C508's for each of thE - M -  Scroll down for this project.      I volunteered to turn a friend of mine's Warhammer 40K Imperial Rhino personel carrier into a remote controlled item.  Little did I understand the undertaking that I had agreed on! My requirements for this project were that the transmitter and receiver had to be a single chip design, done all in software.  I succeeded.  The receiver chip uses a Panasonic 4602 38KHz receiver and that's it for external components.  It has the serial input  (GP3) , two RC hobby servo outputs  (GP0/GP1) and three digital outputs  (GP2,4,5) .  Here is the code for the receiver chip.  It is a bit of a specialty in that the digital outputs are actually "momentary contact" type outputs because I only needed a pulse to go out to trigger a cheap sound board I got from a $6 toy! I don't even use the GP2 output in this design.  The receiver uses 4 NiCd 115MAH cells, the largest set I could fit into the Rhino! __ Designed by Dennis Clark

Analog Bar Graph Expanded Scale Voltmeter -  An expanded scale voltmeter    (ESV) can save your plane.  That may be a strong statement, but it's true.  The crucial radio link that lets you control your plane relies on nickel-cadmium    (NiCd) batteries in the transmitter and receiver __ Designed by Stefan Vorketter

Angelfire rocket GPS payloA - D -  Angelfire now carries a GPS radio downlink system in the nosecone.    It transmits GPS    (Global Positioning System) coordinates to a base station for use in recovering the rocket, as well as providing detailed flight information like altitude, velocity and range.    My particular implementation __ Designed by Vern Knowles

Autopilot: Do it Yourself UAV -  This board has actually flown the helicopter on its own! You can see flight details in kahn.20020922.  Joe Easly made movies of it hovering under software control.  

BattMan II: a Computer Controlled Battery Manager -  BattMan II is a computer controlled battery manager, intended for typical rechargeable batteries used by R/C and electronics hobbyists, as well as various consumer product batteries.   __ Designed by Stefan Vorketter

Bit-Switch -  This micro sized servo signal On-Off decoder can be used in any application where size and weight are critical. __ Designed by T. Black

Build a 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 Vorkoetter

Build a Miniature High-Rate Speed Control with Battery Eliminator (BEC) -  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

Build a Roomba Bluetooth Adapter -  [originally published 15 Feb 2006 in Makezine blog and edited by Phil Torrone.  If you liked the serial port cable/board Roomba how to, you’ll really like this one – controlling a Roomba via Bluetooth! Roomba’s have a serial port that let you entirely control them.  Adding a Bluetooth serial adapter to wirelessly control the Roomba isn’t that hard to do.  It looks just like a serial port to the OS, so the software from the previous how to works with it too. __ Designed by Tod E. Kurt

Build an RC Plane Finder -  The lost plane finder introduced here is a little on board beacon, also known as lost model alarm/crashed aircraft beacon, which helps you find a crashed or downed radio-controlled plane.__ Electronics Projects for You

Building a robot arn using Nitino muscle wire -  A demonstration robot arm can be made with a short length of Nitinol and a few extra components as shown in the animation above.  Nitinol is called Flexinol and possibly vise versa by the layman, but the two are not the same in performance.  This website describes the two materials as equal but you should go to Dynalloy website to see the differences.   __ Designed by Collin Mitchell

Building an RF Remote Control SystE - M -  With a handful of inexpensive components, a little creativity, and the power of PicBasic, you can build some pretty outstanding robotics creations as Rob Arnold proves with his Ruf-Bot project.   __ Designed by Rob Arnold


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

 


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