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ELECTRIC POWER CONTROLLER entries in Index to How To Do It Information
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Detailed entries for one subject from the INDEX TO HOW TO DO IT INFORMATION.
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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.


An audio activated power switch. A device to switch on the "mains" (electric power) to an audio power amplifier whenever an audio signal appears on the input of the amplifier. When the audio signal is removed the device switches the mains off again after a predetermined time (2-6 minutes).
AUDIO AMATEUR 3/1978 [Sep 1978] (v.9#3) pg. 16
Added Info AUDIO AMATEUR 3/1980 [Jun 1980] (v.11#3) pg. 54

Bulb buffer. Simple circuit uses a 60-watt light bulb and a relay to "slow start" an audio amplifier or any other 120-VAC powered device.
AUDIO AMATEUR 4/1981 [Sep 1981] (v.12#4) pg. 37

Using solid-state relays to control supplemental plug boxes to provide safe power control of audio equipment.
AUDIO AMATEUR 2/1986 [May 1986] (v.17#2) pg. 14
Correction AUDIO AMATEUR 3/1986 [Aug 1986] (v.17#3) pg. 49
Added Info AUDIO AMATEUR 4/1986 [Oct 1986] (v.17#4) pg. 48
Correction AUDIO AMATEUR 2/1987 [Mar 1987] (v.18#2) pg. 50

A sequenced power on/off switch. Designed to switch on an audio preamplifier and, after a set delay, switch on a power amplifier. Allows you to add two solid-state relays to control up to four AC items in sequence.
AUDIO AMATEUR 2/1988 [May 1988] (v.19#2) pg. 34
Added Info AUDIO AMATEUR 1/1989 [Feb 1989] (v.20#1) pg. 57
Added Info AUDIO AMATEUR 2/1991 [Apr 1991] (v.22#2) pg. 68

AC sensing control. Switched outlets will be turned on (or off) depending on whether an electrical device connected to a third "hot" outlet is (or is not) drawing electricity. Ideal for controlling separate components in an audio/video system.
AUDIO AMATEUR 2/1989 [Apr 1989] (v.20#2) pg. 32
Added Info AUDIO AMATEUR 4/1989 [Oct 1989] (v.20#4) pg. 56
Correction AUDIO AMATEUR 1/1990 [Feb 1990] (v.21#1) pg. 4

Audio system power controller applies and removes 110-VAC power to a pre-amp and two main amps to avoid turn-on or turn-off artifacts (audible thumps).
AUDIOXPRESS Aug 2003 (v.34#8) pg. 46

Build a keyboard function decoder to turn your computer peripherals on and off from your keyboard.
BYTE Jul 1978 (v.3#7) pg. 98

Lightning storm monitor with automatic computer disconnect. Alerts you to nearby electrical-storm activity, then automatically closes files, saves whatever is in RAM to disk, and powers down your computer. Can be expanded to also disconnect your modem from the phone line. Est. cost: $100. Part 1.
COMPUTERCRAFT Jun 1991 (v.1#3) pg. 18

Lightning storm monitor with automatic computer disconnect. Part 2. Telephone monitor accessory lets you turn on a computer from any telephone.
COMPUTERCRAFT Jul 1991 (v.1#4) pg. 42

Power controller. Vary the power delivered to a 120-volt AC load under software control. Control eight channels of 120-volt AC with a 68705 microcontroller. Can be adapted to let an audio source control the power-controller output.

Power controller. Use a 68705 microcontroller to control eight discrete power Triacs. Eight independent channels of 120-volt AC power can be varied in 32 smooth steps from 0% to 97% of full power. Use to control lights, motors, heaters, etc.
ELECTRONICS NOW Jan 1995 (v.66#1) pg. 68
Correction ELECTRONICS NOW Mar 1995 (v.66#3) pg. 14 (Author's address)

The power pincher. This device will monitor keyboard activity on an IBM-compatible personal computer. If no keys are pressed within a certain time limit, then the video display will be turned off. Est. cost: $45 (kit).
ELECTRONICS NOW May 1995 (v.66#5) pg. 43

Power semiconductors. Part 1. An overview of transistors, thyristors, solid-state relays, and integrated circuits which have been designed to switch high currents and voltages.
ELECTRONICS NOW May 1995 (v.66#5) pg. 57

Power semiconductors. Part 2. Power control circuits. Learn to apply power semiconductors in practical power control circuits. Use them to control appliances, motors, and relays.
ELECTRONICS NOW Jun 1995 (v.66#6) pg. 59
Correction ELECTRONICS NOW Oct 1995 (v.66#10) pg. 14

Power semiconductors. Part 3. Synchronous power control. Learn about zero-voltage or synchronous AC-line power switching and control.
ELECTRONICS NOW Jul 1995 (v.66#7) pg. 63

AC and DC control circuits. Circuits based on the triac or silicone controlled rectifier as the power switching device. (1) AC light-dimming circuits. (2) Universal motor control. (3) DC power control. (4) DC power switching.
ELECTRONICS NOW Aug 1995 (v.66#8) pg. 69

An LED bargraph-driver IC is used as the heart of a circuit to turn audio equipment on and off in sequence to prevent loud transients in the speakers.
ELECTRONICS NOW Feb 1998 (v.69#2) pg. 5

An AC proportional voltage controller for your PC. Use it to control the voltage level of an appliance that uses 110-volt AC service. Connects to the parallel port of a PC. Applications can include light dimming, motor-speed control, heater control, etc.
ELECTRONICS NOW Feb 1999 (v.70#2) pg. 44

EZ start power controller. A stand-alone soft start power controller for audio amplifiers (or other electronic equipment) slowly ramps up the line voltage from 0% to 97% in 25 seconds and then goes to 100%. A good way to extend the life of vacuum tube equipment.
GLASS AUDIO 3/1996 (v.8#3) pg. 54
Correction GLASS AUDIO 5/1996 (v.8#5) pg. 62

Compressor protector. Timer prevents an air conditioning compressor (or a refrigerator or freezer compressor) from re-starting within 5 minutes of a power failure or brownout. This helps protect the compressor motor from burning out. Est. cost: $22.
HANDS-ON ELECTRONICS Jul-Aug 1986 (v.3#4) pg. 89

Circuit for a time-delay relay driver to sequentially power-up separate circuits
HANDS-ON ELECTRONICS Dec 1986 (v.3#7) pg. 24

Switched outlet strip features individual switches for each receptical, MOV surge protection, indicator lamps for each receptical, a master switch and a master "reset" switch.
HANDS-ON ELECTRONICS Jan 1987 (v.4#1) pg. 28

A computer system power controller which includes surge-spike protection. Lets you individually turn on/off your computer and peripherals from one central location. Est. cost: $62.
MODERN ELECTRONICS [2] Nov 1985 (v.2#5) pg. 42

Air-conditioner protection circuit. Prevents motor burnout resulting from momentary power interruption. Designed for 115-volt window units requiring 12 to 20 amperes of current.
MODERN ELECTRONICS [2] Jun 1986 (v.3#6) pg. 20

Automatic printer power controller. Switches on a printer and external printer buffer automatically when you power up any computer sharing them in a multi-computer setup. Requires a +5-volt signal from each computer attached to the printer.
MODERN ELECTRONICS [2] Dec 1987 (v.4#12) pg. 60

A "smart" AC outlet box. Turning on one device automatically powers up two others when all three are plugged into this outlet box.
MODERN ELECTRONICS [2] Sep 1988 (v.5#9) pg. 52

Smart car relay provides automatic operation sensing and switching for equipment used in an automotive electrical environment. Turning on one item can cause another item to be activated.
MODERN ELECTRONICS [2] May 1989 (v.6#5) pg. 50

Substitute current shunt. Shuts off power when excessive current is drawn and restores power when safe to do so. Works automatically without the need for fuses or circuit breakers.
MODERN ELECTRONICS [2] Jun 1989 (v.6#6) pg. 51

Computer-controlled AC interface. Simple interface circuit and BASIC program let you control lights and other appliances from the keyboard of your computer.
MODERN ELECTRONICS [2] Nov 1990 (v.7#11) pg. 40
Correction MODERN ELECTRONICS [2] Jan 1991 (v.8#1) pg. 6
Added Info COMPUTERCRAFT Apr 1991 (v.1#1) pg. 7
Added Info COMPUTERCRAFT Aug 1991 (v.1#5) pg. 6

Smart power strip (plug strip) lets you turn on up to three other devices by just turning on one device.

Remote control switch turns your audio amplifier on and off each time one of your components (tape player, record player, tuner) is turned on or off. Can be adjusted to other uses. Est. cost: $7.
POPULAR ELECTRONICS [1] Jan 1973 (v.3#1) pg. 52

Circuit which maintains power-line contact during short power outages, but will disconnect the electrical equipment if failure exceeds a preset limit.
POPULAR ELECTRONICS [1] Jul 1977 (v.12#1) pg. 80

Compressor guard device. Protect air conditioner, refrigerator and freezer motors from damage during power blackouts or brownouts. This timing device will not allow the electric motors in compressors to restart until 4.5 minutes have elapsed. This gives the system pressures time to equalize.
POPULAR ELECTRONICS [1] Jun 1978 (v.13#6) pg. 41

Controlling AC power. A look at different methods of power control from simple on/off switching through digital and computer operation.
POPULAR ELECTRONICS [1] Mar 1982 (v.20#3) pg. 78

Universal power controller (really a discarded furnace controller) can be adapted to many projects that require a local sensor input.
POPULAR ELECTRONICS [2] Aug 1990 (v.7#8) pg. 22

Controlling power using optoisolators. (1) Circuit uses a 4017 decade divider to contral an AC load, such a Christmas lights. (2) Modifying the circuit to control an inductive load.
POPULAR ELECTRONICS [2] Sep 1991 (v.8#9) pg. 18

Build the socket sentinel. A surge-protected outlet box has one "hot" master and three "dead" slave outlets. Whenever the device connected to the master is turned on, power is supplied to the three slave outlets.
POPULAR ELECTRONICS [2] Sep 1991 (v.8#9) pg. 63

Circuit for controlling power to lamps and soldering irons.
POPULAR ELECTRONICS [2] Dec 1991 (v.8#12) pg. 22

Triac AC circuit senses current flow and activates another AC device.
POPULAR ELECTRONICS [2] Dec 1991 (v.8#12) pg. 22

AC power controller circuit to turn off a stereo system whenever the TV is turned on and vice versa.
POPULAR ELECTRONICS [2] Apr 1993 (v.10#4) pg. 90

Build a computer-controlled AC switch which can turn off a computer and a peripheral after handling a FAX or modem communication, printing a document, or allowing a lengthy program to complete. It also enables you to control other AC devices via your computer's parallel port.
POPULAR ELECTRONICS [2] Jul 1993 (v.10#7) pg. 41

Lamp-driver circuit allows an incandescent lamp to be controlled by CMOS logic gates which aren't designed to handle that much current.
POPULAR ELECTRONICS [2] Nov 1993 (v.10#11) pg. 90

Build the smart strip. An electrical outlet strip features a load-sensing circuit. When one electrical device is turned on, the strip automatically turns on up to three other devices.
POPULAR ELECTRONICS [2] Mar 1996 (v.13#3) pg. 59

Circuit activates a relay when a video signal is detected. Used to turn on a manually-operated TV receiver when a VCR does not have a switched AC receptacle.
POPULAR ELECTRONICS [2] May 1996 (v.13#5) pg. 74

Remote power switch uses a 12-volt step relay to control 115-volt line.
POPULAR MECHANICS Oct 1966 (v.126#4) pg. 202

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

Build this automatic power switcher for your computer or stereo system. This current operated switch turns several outlets on whenever current flow through one of them is detected.
RADIO-ELECTRONICS May 1982 (v.53#5) pg. 54

Multiple-outlet control circuit is used to turn on several components of an audio or video system at the same time. By simply turning on the primary device (such as your amplifier) you cause power to be supplied to all of the other devices.
RADIO-ELECTRONICS Jan 1985 (v.56#1) pg. 33

Circuit built around a 555 timer IC and a 4017 IC are used to trigger up to ten relays that in turn control AC power. The circuit shown is designed to operate a decorative traffic light (or similar device).
RADIO-ELECTRONICS Feb 1991 (v.62#2) pg. 16

Workbench control box. Allows power tools to be constantly connected so they can simply be picked up and used. Power is delivered to appropriate tool by flipping a switch on the control box. Neon lamps glow to tell which tool has power.
WORKBENCH Sep-Oct 1967 (v.23#5) pg. 8

Tip: Build this outlet box for office equipment. Two of the four outlets may be turned on/off with a switch mounted near the outlets.
WORKBENCH Jan-Feb 1983 (v.39#1) pg. 9