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Detailed entries for one subject from the INDEX TO HOW TO DO IT INFORMATION.
Click on a see also (sa) or tracing (xx) to view detailed entries about a related subject.
The entries are in alphabetical order by magazine name and then in chronological sequence.
To obtain a copy of any magazine article contact your local public library or the publisher.

sa   RELAY
xx   RELAY

Tips on interfacing microcomputers to servo mechanisms by means of radio control devices like those used in model airplanes.
BYTE Mar 1977 (v.2#3) pg. 9

Controlling the real world. How to use a microcomputer to control electronic devices that are not TTL compatible. Several circuits are illustrated.
BYTE Mar 1978 (v.3#3) pg. 174

Tune in and turn on. A computerized wireless AC control system. Used to control TV, stereo, lamps and vacuum cleaner. Part 1. The transmitter.
BYTE Apr 1978 (v.3#4) pg. 114

Tune in and turn on. Part 2. Receiver and relays.
BYTE May 1978 (v.3#5) pg. 97

A classroom demonstration: Controlling a system with a microcomputer. A simple airflow control system illustrates the concept of computer control of a physical system.
BYTE Nov 1978 (v.3#11) pg. 112

How to wire several optically isolated solid state relays to a parallel output port of your computer. Use them to control electric devices up to 10 amps (110 volts) by turning them on and off at programmed times. Est. cost: $20 per controller.
BYTE May 1979 (v.4#5) pg. 6

Add some control to your computer. An output port tutorial. How to control from 1 to 16 external devices by means of a single output port using time multiplexing techniques.
BYTE Sep 1979 (v.4#9) pg. 196

Handheld remote control for your computerized home (see also Jan 1980 pg 28).
BYTE Jul 1980 (v.5#7) pg. 22

Modifying Milton-Bradleys' Big Trak motorized toy tank so that it can be radio controlled by a microcomputer.
BYTE Feb 1981 (v.6#2) pg. 44

Audio delay circuit that originally appeared in Popular Electronics is modified for control by an 8-bit parallel port. Demonstrates how to attach a computer to any circuit that normally uses mechanical switches.
BYTE Nov 1981 (v.6#11) pg. 364

Build a touch tone decoder for remote control of various devices via a computer connected to a telephone.
BYTE Dec 1981 (v.6#12) pg. 42

AC motor control. Simple algorithms and hardware. Two experiments illustrate how to connect a microcomputer to an external device.
BYTE Jan 1982 (v.7#1) pg. 118

A versatile low-cost microprocessor controller module. Suitable for a large number of controller applications. Est. cost: $30.
BYTE Dec 1982 (v.7#12) pg. 486

Circuit for driving a small motor or relay from a TTL-level output port.
BYTE Mar 1983 (v.8#3) pg. 487

Control your environment with the Atari 400 or 800 computer. Devices to sense the presence of people and control AC-powered devices.
BYTE Jul 1983 (v.8#7) pg. 428

Build the power I/O system. Controlling ac/dc power in the real world with your computer.
BYTE Dec 1984 (v.9#13) pg. 105

Robotics, control and monitoring with an embedded controller. Using the 8031 eight-bit microcomputer system on a chip and your personal computer as a platform for a wide variety of real-world control applications in robotics, data-acquisitions, and control.
COMPUTERCRAFT Aug 1992 (v.2#8) pg. 10

CYDAT. A universal data collector/controller. Extremely flexible project lets you add inputs and outputs to just about any microcontroller engine to implement virtually any application. Support up to 80 digital inputs and outputs, 80 channels of eight-bit A/D, control up to 80 relay outputs, sense up to 40 5-to-220-volt AC or DC inputs, and control up to 40 24-to-220-volt AC triac outputs. Accommodates a wide range of microcontroller engines. Est. cost: $300. Part 1.
COMPUTERCRAFT Nov 1992 (v.2#11) pg. 49

CYDAT. A universal data collector/controller. Part 2. Circuit construction details and theory behind a practical controller card utilizing the Motorola MC68HC805C8 microcontroller.
COMPUTERCRAFT Dec 1992 (v.2#12) pg. 48

CYDAT. A universal data collector/controller. Part 3. Add a parallel processor arrangement to increase power and flexibility. This upgrade allows you to add modem, nonvolatile memory, real-time clock, speech processor, digital signal processor, math coprocessor, etc.
COMPUTERCRAFT Jan 1993 (v.3#1) pg. 58

CYDAT. A universal data collector/controller. Part 4. Build a hardware card that interfaces the CYDAT system directly to the bus of a PC using any available eight-bit slot.
COMPUTERCRAFT Feb 1993 (v.3#2) pg. 56

Cyber Link. An expandable controller network. Accommodates from 1 to 255 remotely located and independently-oriented controllers. Nodes are linked with three-line RS-232 cable and each node as 32 programmable I/O lines.
COMPUTERCRAFT Jul 1993 (v.3#7) pg. 48

Optically isolated remote control interface uses the presence (or absence) of a spot on your CRT screen to turn on (or off) an output of 5 to 15 volts. Up to 16 outputs can be handled (one at a time).
COMPUTERS & PROGRAMMING Jul-Aug 1981 (v.21#4) pg. 55

How to interface RS-232 signals from computers to the outside world. Includes an interface for driving reed relays, an opto-coupler, an integrator circuit to drive a load, etc.
CQ. THE RADIO AMATEUR'S JOURNAL Apr 1985 (v.41#4) pg. 116

RS-232 monitor/control system incorporates an addressable asychronous receiver/transmitter IC that is well-suited for remote data collection and control. The complete system is composed of a PC, control software, combination RS-232 interface and power-distribution center, and one or more control nodes connected in parallel over a four-conductor bus. The conductors carry power, ground, and the transmit and receive signals. Est. cost: $50.

Wireless controller turns things on and off.
ELECTRONICS ILLUSTRATED Nov 1963 (v.6#6) pg. 99

Automatic impulse switch does not have control power on continuously. Used to remote control electrical devices.
ELECTRONICS ILLUSTRATED Jan 1965 (v.8#1) pg. 73

Wireless tape-recording system uses an FM radio, an FM wireless mike, a tape recorder and the control described in this article. Controller turns recorder on when mike is on and off when mike is off.
ELECTRONICS ILLUSTRATED Nov 1970 (v.13#6) pg. 84

Tip on adding the 50-ohm control-line termination needed by a PC controller card that operates motors, relays, etc.
ELECTRONICS NOW Dec 1992 (v.63#12) pg. 12
Added Info ELECTRONICS NOW May 1993 (v.64#5) pg. 14

The Experimenter. Build a link between your PC and the outside world. Features 8 inputs capable of voltage measurement, 4 timer/counter inputs, 24 digital input/output lines, 8 high-voltage, high-current outputs, and a power relay. Use it to control motors, solenoids, alarms, etc. Connects to the computer via a serial port. Est. cost: $150 (kit). Part 1. Operating theory and commands.
ELECTRONICS NOW Jul 1993 (v.64#7) pg. 31

The Experimenter. Part 2. Construction.
ELECTRONICS NOW Aug 1993 (v.64#8) pg. 64

AGC operated power control turns 120 volts AC on and off with the presence or absence of a signal in the bandpass of a radio receiver.
ELECTRONICS WORLD Dec 1966 (v.76#6) pg. 81

Nomogram chart aids design of remote control circuits to produce timing and triggering spikes.
ELECTRONICS WORLD Jul 1968 (v.80#1) pg. 30

Multiple-function remote-control relay circuits can sense and control high-power circuits.
ELECTRONICS WORLD Aug 1969 (v.82#2) pg. 36

Circuits illustrate how diodes and transistors can be employed for radio receiver channel and band-switching.
ELECTRONICS WORLD Jun 1971 (v.85#6) pg. 34

How computers communicate with the real-world. Includes typical circuit using an opto-isolator to connect a computer to an external load.
ELEMENTARY ELECTRONICS Mar-Apr 1979 (v.19#2) pg. 77

Let electronic slaves do your bidding. What is available in remote control devices for your home.
FAMILY HANDYMAN #226 Feb 1982 (v.32#2) pg. 86

Remote doorbell signal lamp controller. This lamp controller will turn on any kind of conventional 117-volt AC lamp each time the doorbell is pushed.
HANDS-ON ELECTRONICS Mar-Apr 1986 (v.3#2) pg. 66

3-channel appliance controller is designed for use with the Commodore 64 computer. Positive signals from the output port turn electrical appliances on-or-off. Includes a listing of the control program run by the computer.
HANDS-ON ELECTRONICS Jul-Aug 1986 (v.3#4) pg. 81

Computer control of the entire world. Two circuits study the problems involved in trying to interface computers to control a household appliance.
HANDS-ON ELECTRONICS Jan 1987 (v.4#1) pg. 25

Remote control circuits. (1) DC-load controller uses a rotary switch and two-wire cable to control 2 or 3 functions. AC-load verson also shown. (2) 16-function controller operates over a 5-conductor cable. (2) 10-function control requires only a two-wire cable.
HANDS-ON ELECTRONICS Jul 1988 (v.5#7) pg. 86

Remote possibilities. Introduction to operating blinds, ceiling fans, fireplaces and other household conveniences with wireless pushbutton controls.
HOME MECHANIX #751 Dec 1990-Jan 1991 (v.86) pg. 58

Temperature sensing. How a simple and accurate temperature sensor can be built. How to interface and control it with a computer. Includes software for controlling, calibrating and running the thermometer. Software is for the SWTP 6800 microcomputer, but can be adapted.

A review of the construction and use of the PAIA 8700 single-board computer available from PAIA Electronics, Inc. This computer uses the 6503 microprocessor and is intended for use in controller applications, and not as a general purpose computer.

Build the output buffer/driver. A six-channel interface that permits computer-controlled, independent, dc-current switching of multiple external devices via a TTL-compatible I/O port.

Kilobaud klassroom. Part 19. Build an inexpensive, dedicated control computer. Uses a Motorola 6802 CPU, 2716 EPROM, 6820 peripheral interface adapter, and miscellaneous parts. Estimated cost: $50.

The intelligent toaster. Experiments in computer control. Series on experiments in computer control and robots begins.
MICROCOMPUTING Nov 1982 (v.6#11) pg. 46

The intelligent toaster. Experiments in computer control. A look at voice input and output systems.
MICROCOMPUTING Dec 1982 (v.6#12) pg. 52

The intelligent toaster. Experiments in computer control. Design and construct your own video touch keypad.
MICROCOMPUTING #73 Jan 1983 (v.7#1) pg. 42

The intelligent toaster. Experiments in computer control. Continued discussion on designing and constructing touch circuits to input information.
MICROCOMPUTING #74 Feb 1983 (v.7#2) pg. 72

The intelligent toaster. Experiments in computer control. Before you build computer-controlled devices, you need to understand single-chip intelligence. EPROMs.
MICROCOMPUTING #75 Mar 1983 (v.7#3) pg. 92

The intelligent toaster. Experiments in computer control. Single-chip intelligence. How to program the 8748 EPROM.
MICROCOMPUTING #77 May 1983 (v.7#5) pg. 48

The intelligent toaster. Experiments in computer control. Single-chip intelligence. Programming and use of the Intel 8748 "computer-on-a-chip".
MICROCOMPUTING #79 Jul 1983 (v.7#7) pg. 90

How to construct your own simple and inexpensive output line that doesn't require any electrical connection to the computer itself. Use it to control small electrical appliances. Est. cost: $30.
MICROCOMPUTING #82 Oct 1983 (v.7#10) pg. 82

The intelligent toaster. Experiments in computer control. How to construct the "command communicator" portion of the UNIMEM home control system.
MICROCOMPUTING #83 Nov 1983 (v.7#11) pg. 100

The intelligent toaster. Experiments in computer control. Subroutines to support the "command communicator".
MICROCOMPUTING #84 Dec 1983 (v.7#12) pg. 76

Circuit for controlling an external electric device with a signal from your computer.
MODERN ELECTRONICS [1] Mar 1978 (v.1#2) pg. 6

Octal output circuit (port driver circuit) is suited for medium-power loads (up to 0.5 ampere each). Loads may be lamps, relays, valves, small steppers, etc.
MODERN ELECTRONICS [2] Feb 1985 (v.1#5) pg. 72

Experimenter's interface device. Simple add-on device lets you explore electronic control with your home computer. Designed to connect to the 24-pin user port of a Commodore 64 computer, but can be adapted to other computers. Part 1.
MODERN ELECTRONICS [2] Apr 1985 (v.1#7) pg. 48

Experimenter's interface device. Part 2.
MODERN ELECTRONICS [2] May 1985 (v.1#8) pg. 56

Experimenter's interface device. Part 3. Experimenting with input and output lines on a Commodore-64 computer. Projects include a sequential binary counter, alarm clock, power control, and alarm system.
MODERN ELECTRONICS [2] Sep 1985 (v.2#3) pg. 64

How to control AC power with a personal computer. Some ideas and examples.
MODERN ELECTRONICS [2] Sep 1986 (v.3#9) pg. 69

Programmable digital sequencers and controllers. Use them to activate LEDs, motors, solenoids, etc. Part 1. Construction of a 16-step, 4-bit programmable digital sequencer is shown which uses a "punched card" and simple card reader to enter the programs.
MODERN ELECTRONICS [2] May 1988 (v.5#5) pg. 62

Programmable digital sequencers and controllers. Part 2. Construction of a 256-step, programmable digital sequencer is shown.
MODERN ELECTRONICS [2] Jun 1988 (v.5#6) pg. 70

Easy computerized control and monitoring. An economical way to monitor sensors and actuate electrically operated devices using a computer, external controller and a BASIC language interpreter.
MODERN ELECTRONICS [2] Jul 1989 (v.6#7) pg. 14

"Multi-Trol" can control almost any device with nearly any signal.
POPULAR ELECTRONICS [1] May 1964 (v.20#5) pg. 40

Master control SCR switching center so you can control equipment from a remote or local position with automatic or manual go-no-go type switch, photocell or sensor.
POPULAR ELECTRONICS [1] Mar 1965 (v.22#3) pg. 53

Control circuit uses ability of diode to rectify AC and to block DC of reverse polarity. Thus a 2-wire control line is used to operate any of three relays.
POPULAR ELECTRONICS [1] Apr 1966 (v.24#4) pg. 76

Switching device turns on outside lights when a car pulls into your driveway or when the doorbell is pushed. Est. cost: $25.
POPULAR ELECTRONICS [1] Jun 1969 (v.30#6) pg. 51

Low-voltage remote power control can remotely handle switching of 600 watts at 120 volts AC.
POPULAR ELECTRONICS [1] Jul 1971 (v.35#1) pg. 69

Selective call receiver monitor turns on the CB audio only when a special signal is received. Using an agreed-upon channel, the caller and receiver have electronic devices to send and receive the special signal. Est. cost: $50.
POPULAR ELECTRONICS [1] Nov 1976 (v.10#5) pg. 41

Tips on using the wireless audio system described in the January 1976 issue as the basis for a computer-based remote control system for your house.
POPULAR ELECTRONICS [1] Aug 1977 (v.12#2) pg. 88

How to interface microprocessors to external devices.
POPULAR ELECTRONICS [1] Dec 1977 (v.12#6) pg. 66

Control your model railroad with audio tape. Signals from a cassette tape serve as a storage system for timed "stop and go" commands. Schematic and construction details for a pulse generator which is used to store control pulse on tape and then to decode it for controlling the train.
POPULAR ELECTRONICS [1] Nov 1978 (v.14#5) pg. 83

Make your computer work as a control center. Simple circuits enable small computers to perform a variety of external operations.
POPULAR ELECTRONICS [1] Sep 1979 (v.16#3) pg. 80

Circuit connects to the audio output jack of a volunteer fire department monitor and turns on a lamp by means of a relay that is activated when the alarm sounds.
POPULAR ELECTRONICS [1] Oct 1980 (v.18#4) pg. 84

Build a remote-control interface for your computer. Use any TV or VCR infrared remote to control a multimedia presentation or a software demo that requires only a reasonable number of commands.
POPULAR ELECTRONICS [2] Feb 1997 (v.14#2) pg. 49
Correction POPULAR ELECTRONICS [2] May 1997 (v.14#5) pg. 6

The PC parallel-port relay. Circuit consist of eight relays that can switch loads of up to 117-volts AC (at 10 amps each) under the control of almost any computer running MS-DOS or Windows. Est. cost: $50 (kit).
POPULAR ELECTRONICS [2] Sep 1997 (v.14#9) pg. 45
Added Info POPULAR ELECTRONICS [2] Dec 1997 (v.14#12) pg. 6

House Watcher. Electric control box turns on lights and radio at intervals around the clock to give home a lived-in look.
POPULAR MECHANICS Jun 1971 (v.135#6) pg. 120

Low-voltage remote control allows operating your hi-fi from any room in the house.
POPULAR MECHANICS Oct 1971 (v.136#4) pg. 132

Special electrical controller operates up to six 110-volt outlets, each one on a different timing sequence. The varying light patterns of people-at-home can be simulated by installing one of these controlled outlets in every normally used room for use when no one is home.
POPULAR SCIENCE Jun 1971 (v.198#6) pg. 98

LED bar-graph display. Eight simple electronic gadgets include a position indicator for remote selector.
RADIO-ELECTRONICS Oct 1979 (v.50#10) pg. 93

A 555-timer-based signaling and control circuit that can be used in a variety of applications.
RADIO-ELECTRONICS Jun 1980 (v.51#6) pg. 80

Computer control board uses eight optoisolator-driven triacs to provide computer control of 8 AC operated devices. Control 117 volt devices up to 2 amps each. Estimated cost: $115.
RADIO-ELECTRONICS Nov 1980 (v.51#11) pg. 65

Lower or raise the volume on your TV set, or anything else, by means of remote control.
RADIO-ELECTRONICS Apr 1981 (v.52#4) pg. 82

Remote volume attenuator (control) can be operated by either analog or digital means.
RADIO-ELECTRONICS Feb 1982 (v.53#2) pg. 50

How to interface several types of popular 8-bit microprocessor IC's to provide TTL inputs and outputs, or to control relays or high voltage devices.
RADIO-ELECTRONICS Jan 1983 (v.54#1) pg. 59
Added Info RADIO-ELECTRONICS Jun 1983 (v.54#6) pg. 24

Home control computer. Part 1. Build this controller for your home computer to control external appliances or systems. Connects to an RS-232 output port. Can service several external devices. Est. cost: $170.
RADIO-ELECTRONICS Apr 1984 (v.55#4) pg. 47

Home control computer. Part 2.
RADIO-ELECTRONICS May 1984 (v.55#5) pg. 64

Home control computer. Part 3.
RADIO-ELECTRONICS Jun 1984 (v.55#6) pg. 78

Interfacing the Timex Sinclair 1000 or ZX81 computer to the real world. Part 1. Interfacing to a clock/calendar IC, a temperature indicator, a light controller, and a heater controller.
RADIO-ELECTRONICS Jul 1984 (v.55#7) pg. 57
Correction RADIO-ELECTRONICS Dec 1984 (v.55#12) pg. 25

Interfacing the Timex Sinclair 1000 or ZX81 computer to the real world. Part 2. Some general software principles and a look at machine-language programming.
RADIO-ELECTRONICS Aug 1984 (v.55#8) pg. 53

Interfacing the Timex Sinclair 1000 or ZX81 computer to the real world. Part 3. How to measure temperature, create a security system, and control high-power devices.
RADIO-ELECTRONICS Sep 1984 (v.55#9) pg. 71

Interfacing the Timex Sinclair 1000 or ZX81 computer to the real world. Part 4. Add speech capabilities and how to free up the computer's port for other uses.
RADIO-ELECTRONICS Nov 1984 (v.55#11) pg. 70

A versatile remote controller. Part 1. Adding remote control to any circuit is not as hard as you might think. This article shows how its done using the Motorola MC14457 remote control transmitter and MC14458 remote control receiver IC's.
RADIO-ELECTRONICS Oct 1985 (v.56#10) pg. 65

A versatile remote controller. Part 2.
RADIO-ELECTRONICS Nov 1985 (v.56#11) pg. 64

Remote-control system. Part 1. Beginning a discussion of the systematic approach needed to design remote control systems.
RADIO-ELECTRONICS Dec 1986 (v.57#12) pg. 86

Remote-control system. Part 2. Remote-control transmitter uses DTMF (dual tone multi-frequency) signals
RADIO-ELECTRONICS Jan 1987 (v.58#1) pg. 82

Remote-control system. Part 3. DTMF receiver.
RADIO-ELECTRONICS Mar 1987 (v.58#3) pg. 82

Remote-control system. Part 4. An output decoder for the DTMF transmitter-receiver.
RADIO-ELECTRONICS Apr 1987 (v.58#4) pg. 76

REACTS 7000 (Radio-Electronics Advanced Control System). Part 1. Introduction to building a control/robotics computer based upon the DataBlocks, Inc. "Altair II" system (a complete line of modular control elements). Use this sophisticated control computer to operate almost every appliance or system in your home.
RADIO-ELECTRONICS Feb 1988 (v.59#2) pg. 47

REACTS 7000 (Radio-Electronics Advanced Control System). Part 2. An in-depth look at the CPU board's circuitry which is built around the Z80 microprocessor.
RADIO-ELECTRONICS Mar 1988 (v.59#3) pg. 49

REACTS 7000 (Radio-Electronics Advanced Control System). Part 3. Build the CPU module.
RADIO-ELECTRONICS Apr 1988 (v.59#4) pg. 52, 70

REACTS 7000 (Radio-Electronics Advanced Control System). Part 4. High-speed semiconductor-disk system.
RADIO-ELECTRONICS May 1988 (v.59#5) pg. 50

REACTS 7000 (Radio-Electronics Advanced Control System). Part 5. How REACTS can perform useful tasks in the home.
RADIO-ELECTRONICS Jun 1988 (v.59#6) pg. 51, 63

REACTS 7000 (Radio-Electronics Advanced Control System). Part 6. Build a digital door lock, an appliance controller, a security system, and a sprinkler controller for your garden.
RADIO-ELECTRONICS Jul 1988 (v.59#7) pg. 46, 66, 67

REACTS 7000 (Radio-Electronics Advanced Control System). Part 7. Adding a CRT controller and printer port.
RADIO-ELECTRONICS Aug 1988 (v.59#8) pg. 45

RS-232 monitor/control system. Hardware and software of an I/O control system that interfaces to your personal computer through an RS-232 port, is modular, and has full duplex operation for both input and output. Est. cost: $50.
RADIO-ELECTRONICS Aug 1988 (v.59#8) pg. 83, 68
Correction RADIO-ELECTRONICS Sep 1988 (v.59#9) pg. 16

REACTS 7000 (Radio-Electronics Advanced Control System). Part 8. Data registers and building the CRT controller/keyboard interface.
RADIO-ELECTRONICS Sep 1988 (v.59#9) pg. 45

REACTS 7000 (Radio-Electronics Advanced Control System). Part 9. Wireless home automation. Using the REACTS system to control X-10 remote control modules.
RADIO-ELECTRONICS Oct 1988 (v.59#10) pg. 65

REACTS 7000 (Radio-Electronics Advanced Control System). Part 10. Wireless home automation. Using the REACTS system to control X-10 remote control modules (continued).
RADIO-ELECTRONICS Nov 1988 (v.59#11) pg. 65, 71, 72

REACTS 7000 (Radio-Electronics Advanced Control System). Part 11. A battery-backup power supply.
RADIO-ELECTRONICS Jan 1989 (v.60#1) pg. 65

Overview of techniques for controlling large 120-volt AC light bulbs directly from a personal computer.
RADIO-ELECTRONICS Mar 1989 (v.60#3) pg. 26