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Radio Control Circuits
#'s - Q        R - Z


Last Updated: October 24, 2017 02:55 PM

Capacitance Proximity Switch
Draws very low power - Ideal for battery-powered applications
6 Models Available - Call 806-368-7747


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

 

1-transistor FM Transmitter - A truly minimalist circuit.  Performance is relatively poor and stability is a problem.  Q1 modulates the signal and acts as an oscillator.  L1 and C5 determine the frequency.  Decrease C5 for a higher frequency and vice-versa. __ 

2 Transistor FM Transmitters - While there are a plethora of similar 2-transistor schematics available, this one is above average.  A major improvement over little 1-transistor circuit that we've discussed previously, this transmitter consist of two stages.  first transistor is used to amplify audio, __ 

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

0.14V RC Oscillator with Separate Logic Output Buffer - Circuit ideas for Designers App Note__ Advanced Linear Devices, Inc

2-Transistor FM Transmitter - While there are a plethora of similar 2-transistor schematics available, this one is above average.  A major improvement over the little 1-transistor circuit that we've discussed previously this transmitter__ copy of geocities.com/tomzi.geo page

4-Watt AF Amplifer - I have recently included a page about AF amplifiers for use with Homebrew rigs.  in this I mentioned that I may include a practical one-watt circuit, complete with PCB foil and layout.  Here it is, but I have taken the liberty of engineering it to provide 4-watts of AF output and with a frequency response almost suitable for Hi-Fi applications __ Designed by Harry Lythall-SM0VPO

68HC11 stepper Motor control - Simple circuit with 16-pin Nitron chip 68HC908, easy analog setting, source code with IC C08.  New s-record for 8-pin 68HC908QT2! __ Designed by Ludwig Orgler-Fachingenieur Elektrotechnik

A 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

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 NIC d 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 (IC s) 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 by radio 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

Add phases to Simple Circuit RC oscillator - 08/25/14  EDN Design Ideas:  Demonstrates a simple way to generate a multiphase clock signal, the frequency of which can be varied with minimal change in phase shift (s).  The phase shift of the second output can be tuned from near zero to 180 without affecting the frequency.  The basic circuit uses a minimum of parts: one cap, two resistors, plus two Schmitt triggers. __ Circuit Design by Einar Abell

An On/Off Motor Control with Brake - The circuit for the controller begins with a buffer, consisting of R1, R2, R3, and Z1A, which isolates the receiver from the rest of the circuit and makes operation of the circuit independent of the exact signal levels from the receiver. __ Designed by Stefan Vorketter

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 (NIC d) batteries in the transmitter and receiver __ Designed by Stefan Vorketter

Another Simple Circuit FM Transmitter - Here is the schematic, PC board pattern, and parts placement for a low powered FM transmitter.  The range of the transmitter when running at 9V is about 300 feet.  Running it from 12V increases the range to about 400 feet.  This
transmitter should not be used as a room or telephone bug. __ Designed by Kamran Ahmed-UK

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

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 Brake - Many designs for high-rate speed controls have been published.  Most require two 8-pin integrated circuits (IC s) 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 an On/Off Motor Controller with Brake - The circuit for the controller begins with a buffer, consisting of R1, R2, R3, and Z1A, which isolates the receiver from the rest of the circuit and makes operation of the circuit independent of the exact signal levels from the receiver. __ Designed by Stefan Vorketter

DTMF Radio Remote Control - Here is a circuit of a remote control unit which makes use of the radio frequency signals to control various electrical appliances.  This remote control unit has 4 channels which can be easily extended to 12.  This circuit differs from similar circuits in view of its simplicity and a totally different concept of generating the control signals __ Designed by Radioland.net

FM Transmitter - While there are a plethora of similar 2-transistor schematics available, this one is above average.  A major improvement over little 1-transistor circuit that we've discussed previously, this transmitter consist of two stages.  first transistor is used to amplify audio, __ 

FM Transmitter Circuit - Schematic only, no circuit description is included __ Designed by Kamran Ahmed-UK

Four-Watt AF Amplifer - I have recently included a page about AF amplifiers for use with Homebrew rigs.  in this I mentioned that I may include a practical one-watt circuit, complete with PCB foil and layout.  Here it is, but I have taken the liberty of engineering it to provide 4-watts of AF output and with a frequency response almost suitable for Hi-Fi applications __ Designed by Harry Lythall-SM0VPO

Getting the Most from Your Radio Control System - About a year after the maiden flight, I wanted to get into electrics, so I bought a Great Planes Spectra.  I figured I'd just buy another receiver and three servos.  WRONG!  I found out that it would be cheaper to buy another transmitter, receiver, and three servos __ Designed by Stefan Vorketter

HC11 Controls the Stepper - Simple circuit with 16-pin Nitron chip 68HC908, easy analog setting, source code with IC C08.  New s-record for 8-pin 68HC908QT2! __ Designed by Ludwig Orgler-Fachingenieur Elektrotechnik

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 (IC s) 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

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

Low Cost Thermal Peak Detection Charger - The electric model aircraft and car industries have produced a bewildering array of field chargers for NIC d 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 Vorkoettert

Miniature High-Rate Speed Control with BEC - My first Speed 400 powered plane was the Sydney's Special, an 80% scaled down version of Vernon Williams' Fred's Special, as published in the November 1991 issue of Model Airplane News.  I chose this project because I was really happy with my original-size 46" Speed 600 powered Fred's Special.  The scaled down version has a 37" __ Designed by Stefan Vorkoettert

Miniature High-Rate Speed Control with Brake - Many designs for high-rate speed controls have been published.  Most require two 8-pin integrated circuits (IC s) 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__ 

On/Off Motor Controller with Brake - The circuit for the controller begins with a buffer, consisting of R1, R2, R3, and Z1A, which isolates the receiver from the rest of the circuit and makes operation of the circuit independent of the exact signal levels from the receiver. __ Designed by Stefan Vorketter

One-transistor FM Transmitter - A truly minimalist circuit.  Performance is relatively poor and stability is a problem.  Q1 modulates the signal and acts as an oscillator.  L1 and C5 determine the frequency.  Decrease C5 for a higher frequency and vice-versa. __ 

Plane Motor Controller with High-Rate ESC, 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

Pulse Width-to-Voltage Converter - This is the circuitry that we evolved (and discarded!) for the interface.  it is in two parts because of the mechanical design of the caddy.  The first half is a speed interface which simply translates the standard radio control pulse width to an analogue voltage which is fed to one of 4QDs motor speed controllers.  I know - the circuit looks too complicated for such a simple task, but it is in fact doing a few other tasks that the customer required. __ Designed by Richard Torrens


Radio Control:  #'s - Q        R - Z

 


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