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Control Circuits

 
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Last Updated: October 24, 2017 02:54 PM

Circuits Designed by Dave Johnson, P.E.

Reduced Power Sequential LED FlasherThe 74HC4017 is a neat decade counter which has 10 decoded outputs.  When supplied with a low frequency clock and with a LED attached to each of the outputs, an interesting ten step sequential flasher effect can be produced.  The LEDs can be configured in . . . Hobby Circuit designed by David A. Johnson P.E.-November, 2008


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

RC Speed Controller -  fed up of paying £20 for controllers? This 10amp pic version has braking and calibration features.   __ Contact: P. Townshend EduTek Ltd

RCFS -  Our original R/C Fail-Safe project. It has been replaced by RCFS-V2 (see above). __ Designed by T. Black

RCFS-V2 -  Add R/C Fail-Safe features to any servo. A microcontroller continuously monitors the servo's pulse signal and it takes over if the transmitted R/C signal is bad. For use with PPM (AM/FM) Rx's. __ Designed by T. Black

RCM710 Electronic Scale -  RCM710 ELECTRONIC SCALETechnical Design Manual__ Airborn Electronics, Australia

RC-Mon -  Build your own low cost R/C frequency monitor. You can use this to check for interference from other transmitters and glitch inducing noise sources at your flying site. __ Designed by T. Black

RCST -  R/C Servo Tester. This pocket sized device is perfect for checking and testing your servos. It features digital accuracy and convenient features, including a servo exercise mode. __ Designed by T. Black

RC-Timed Shutoff Function Uses Op Amp & Momentary Switch -  02/16/12  EDN-Design Ideas Battery-operated instrument benefited from auto-power shutdown.  A handheld, battery-operated “fiber finder” measures the light escaping from an optical fiber when clamped in a V-shaped block under slight pressure.  A pair of photodiodes on each side of the resulting bend compares analog levels to indicate the presence and direction of light travel, and PLL tone decoders indicate the presence of as many as three optical-modulation tones.  The idea is to “tag” a fiber with a central-office signal __ Circuit Design by Glen Chenier, Teeter Totter Tree Stuff, Allen, TX

RD68HC908IRC : MC68HC908QT2 Based Simple Circuit Infrared Remote Control Reference Design -  Motorola has developed a simple, single dedicated device, infrared remote control designed to control a DVD player.  This reference design demonstrates how to time and create modulated infrared signals used to control six basic functions of the DVD player.   __ Designed by Freescale

RD68HC908LHID : LIN-bus HID Lamp Levelling Stepper Motor Control using the Motorola 908E625 -  This reference design describes a car High Intensity Discharge (HID) lamp leveling system with a LIN-bus interface.  An essential part of the system is a stepper motor controller operating as a LIN-bus slave (LIN Stepper Controller).  All functionality __ Designed by Freescale

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

Reduce relay coil current with a reset controller IC -  EDN-Design Ideas 12/22/2015    A new twist on reducing power when driving relays and solenoids __ Circuit Design by Peter Baxter

Reduced Power Sequential LED Flasher -  The 74HC4017 is a neat decade counter which has 10 decoded outputs.  When supplied with a low frequency clock and with a LED attached to each of the outputs, an interesting ten step sequential flasher effect can be produced.  The LEDs can be configured in . . . Hobby Circuit designed by David A. Johnson P.E.-November, 2008

Redundant power-supply diode features fanless passive cooling -  A Schottky diode is an excellent way to connect multiple batteries or dc power supplies to a load.  With a forward-biased or diode between each supply and the load, faults are __ Designed by Circuit Daniel Gomez-Ibanez Woods Hole Oceanographic Institution

Reference Design for an 802.11b/g RF Front-End Module using the MAX2830 -  App Note 4156  -- 3/27/2008 --  (add 5/08) __ Maxim Integrated

Relatively Simple Circuit thermostat -  A basic circuit using Diodes to detect temperature differences __ Designed by G.L. Chemelec

Relay for relay control via an RS232 port -  Circuit diagram 

Remote Access to Raspberry Pi -  Raspberry Pi is an excellent platform to learn programming and interfacing of a computer with the real world.  But it is always annoying to move to a completely different setup to...__ Electronics Projects for You

Remote Audio Level Indicator -  The normal level-indicator circuits which are available in the market require connections to be made to the output of the player, which may not be easily accessible.  The audio level indicator circuit described here removes this restriction as it may be placed close to the player’s speakers and yet the desired effect can be __ Designed by Popescu Marian

Remote Charging uses Three Wire Sensing -  05/25/95 EDN-Design Ideas Remote voltage sensing usually uses a four wire sensing System, this System works with three Wires.    __ Circuit Design by D Hayden, Tempo Research, Vista, CA

Remote Control -  This is a simple wireless remote control unit, which was originally designed for a model hovercraft which I was developing with the help of my friend Uday Arya.  The project has been discontinued for technical reasons, but this remote control unit survives.  The method used seems to be quite popular among many remote control units.  

Remote Control -  In the article ‘RGB LED Mood Lighting’ (Elektor, February 2008) we mentioned that a remote control could be added to the unit.  Here we describe how it is done, connecting an eZ430-RF2500 to the MSP430 microcontroller.  The ideas presented can be adapted to a wide range of other applications --- must register on this site __ Designed by Published in Elecktor July/Aug, 2010

Remote Control based on PIC -  Control up to 8 devices by this easy constructable remote control.  It can work as a radio or infrared remote control, depending on the components.  Each device output can be configured to be momentary (turned on while you press the button) or latched.  Latched outputs can be toggled on/off by one button per channel, or turned on and off by two buttons per channel __ Designed by Peter Jakab

Remote Control Beeper -  uses rf tx/rx modules with a range of about 30m.   __ Contact: P. Townshend EduTek Ltd

Remote Control Dog Door Opener -  Gadget Freak: Remote Control Dog Door Opener.    Sometimes you can't teach an old dog new tricks.  Tired of trudging down the stairs to let his dog out of his cage in the middle of the night, Les designed a remote control door opener.  The system.   __ Designed by Gadget Freak

Remote Control Encoder/Decoder with PIC16C620 & PIC12C508 -  Control up to 8 devices by this easy constructable remote control.  It can work as a radio or infrared remote control, depending on the components.  Each device output can be configured to be momentary (turned on while you press the button) or latched.  Latched outputs can be toggled on/off by one button per channel, or turned on and off by two buttons per channel.   __ Designed by Peter Jakab

Remote Control Extender Mk 4 -  An Infra Red wired Repeater circuit to control appliances from a remote location. __ Designed by Andy Collison

Remote Control for Home Appliances -  The influx of the Internet of things (IoT) devices has created a huge demand for connecting everything to everything.  In the same race, this remote control for home appliances lets you...__ Electronics Projects for You

Remote Control for Raymarine ST4000 Autopilot -  Schematic Only  -uses raytheon's seatalk®communications protocol. (16f628)  __ Designed by Jon Fick

Remote Control for Sony a/  Volt Equipment -  PIC based remote controller for Infrared and wired Control-S bus __ Designed by Eric Smith

Remote Control for Toy Car -  Make any battery-operated toy car remote-controlled using this circuit.  The circuit, consisting of an infrared transmitter-receiver pair, uses IR beam transmission to switch the toy car 'on' or 'off '.  To...__ Electronics Projects for You

Remote Control Jammer -  Collection of Gag circuits, scroll to find this one.  Do you have an incessant channel hopper that is driving you crazy? Or perhaps you simply want to enforce your own selections.  The TV Remote Control Jammer will do the trick. 

This circuit is a redo of an older design which is not effective on modern remotes.  Modern remote controls are hard to jam but with a little care this circuit will do the job.  The circuit is just a flasher operating at 40 kHz which is the carrier frequency used by common remote controls.  The strong 40 kHz infrared flashing interferes with the signal from the remote.   __ Contact: Charles Wenzel of Wenzel Associates, Inc.

Remote Control Of Webcam through Internet -  Necessity is the mother of invention, and that’s how I could find a smart solution for controlling my webcam from a remote location where distance is no limit.  This article describes...__ Electronics Projects for You

Remote Control Transmitter -  Although ready-made remote controls are easy to get, with this project we show how to build on at home.  Features are impressive, with 6 radio channels and long battery life.  Complete with PCB layout.   __ Designed by Projects & Ideas from Nutchip.com

Remote control transmitter-control Devices from the PC -  Control all your devices from the PC.  This infrared remote control transmitter can be controlled from a computer.  It speaks many different remote control formats, like the Philips RC-5 standard and can be tailored to other specific types.   __ Designed by Peter Jakab

Remote control turns battery on & off -  09/12/97 EDN-Design Ideas The circuit in Figure 1 acts as a latching solid-state relay.  A short application of a magnetic field in the vicinity of S1 toggles the relay on and off.  The relay switches power from a 3V battery at load currents as high as 10 mA.  This remote switch is ideal for battery-powered applications.  In the off state, the circuit draws no current; in the on state, the circuit draws only 100 µA.  All the parts are inexpensive and readily available.    __ Circuit Design by Allen Harstine,Integrated Measurement Systems Inc, Beaverton, OR

Remote control uses an IR Receiver chip to receive the IR signal from the remote -  The circuit uses an IR receiver chip to receive the IR signal from the remote. The chip includes a bandpass filter and a demodulator, so the output is a logic signal.   The signal is then processed by an Atmel 89C2051 chip that decodes the remote signal and controls the volume pot and relays. __ Contact: mcs @ post5 . Tele . dk

Remote control using telephone -  Here is a tele-remote circuit which enables switching "on" and "off" of appliances through Telephone lines.  The circuit described here can be used to switch up to nine appliances (corresponding to the digits1 through 9 of DTMF the Telephone key-pad).  The Telephone can be used to switch

Remote control using VHF Modules -  A few designs for remote control switches, using VG40T and VG40R remote control pair, are shown here.  The miniature transmitter module shown in Fig.1, which just measures 34 mm x 29 mm x 10 mm, can be used to operate all remote control receiver-cum-switch combinations described in this project __ Designed by Radioland.net

Remote Control using Wireless Doorbell -  This circuit lets you wirelessly control an appliance from a remote place by using a wireless doorbell.  The appliance is triggered by the signal from the transmitter of the wireless doorbell...__ Electronics Projects for You

Remote Control Your Computer -  The circuit shown above is a simple Infrared receiver.   Heart of the circuit is TSOP-1738 infrared detector chip.  TSOP-1738 detects infrared signals generated by your remote and generates electrical pulses on its out pin.  These electrical pulses finally goes into your computer via serial port's DCD pin. __ ` Sigmatone

Remote control-build your own -  Latched outputs can be toggled on/off by one button per channel, or turned on and off by two buttons per channel.   __ Designed by Peter Jakab

Remote Controlled Alarm -  A very interesting remote controlled alarm circuit using TSOP1736.  Routing of an electric cable to attach a calling bell switch near the bed of an old age/patient is not a good idea.  Here is an ultra simple battery operated remote controlled alarm to help old age members/patients in bed, especially at home/hospital.  Any __ Designed by T.K. Hareendran

Remote Controlled Digital Audio Processor -  These days most audio systems come with remote controllers.  However, no such facility is provided for normal audio amplifiers.  Such audio controllers are not available even in kit form.  This article...__ Electronics Projects for You

Remote Controlled Lighting -  This remote controlled switch circuit can control AC loads such as lights, fans etc through the remote handset of TV.  It uses the 555 timer in the bistable mode.  In the bistable mode output IC555 keeps two states, either low or high.  When a negative pulse is applied to the trigger pin 2 of 555, the output turns high and __ Designed by D Mohankumar

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Control Circuits:   #'s - A       B - C       D - G        H - L       M - P        Q - S        T - U        V - Z

 


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