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Last Updated
03/31/2019
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Detailed entries for one subject from the INDEX TO HOW TO DO IT INFORMATION. |
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ELECTRIC POWER CONTROLLER sa ELECTRIC LIGHTING CONTROLLER sa ELECTRIC MOTOR CONTROL & WIRING sa PHOTOELECTRIC LIGHT CONTROL x CONTROLLER (ELECTRIC POWER) x POWER CONTROLLER (ELECTRIC) xx ELECTRIC xx REMOTE CONTROL xx SWITCH xx VOLTAGE MONITOR xx VOLTAGE REGULATOR 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). 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. Using solid-state relays to control supplemental plug boxes to provide safe power control of audio equipment. 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. 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 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). Build a keyboard function decoder to turn your computer peripherals on and off from your keyboard. 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. Lightning storm monitor with automatic computer disconnect. Part 2. Telephone monitor accessory lets you turn on a computer from any telephone. 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. 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). 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. 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. Power semiconductors. Part 3. Synchronous power control. Learn about zero-voltage or synchronous AC-line power switching and control. 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. 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. 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. 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. 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. Circuit for a time-delay relay driver to sequentially power-up separate circuits 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. 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. 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. 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. A "smart" AC outlet box. Turning on one device automatically powers up two others when all three are plugged into this outlet box. 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. 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. Computer-controlled AC interface. Simple interface circuit and BASIC program let you control lights and other appliances from the keyboard of your computer. 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. Circuit which maintains power-line contact during short power outages, but will disconnect the electrical equipment if failure exceeds a preset limit. 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. Controlling AC power. A look at different methods of power control from simple on/off switching through digital and computer operation. Universal power controller (really a discarded furnace controller) can be adapted to many projects that require a local sensor input. 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. 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. Circuit for controlling power to lamps and soldering irons. Triac AC circuit senses current flow and activates another AC device. AC power controller circuit to turn off a stereo system whenever the TV is turned on and vice versa. 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. Lamp-driver circuit allows an incandescent lamp to be controlled by CMOS logic gates which aren't designed to handle that much current. 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. 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. Remote power switch uses a 12-volt step relay to control 115-volt line. 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. 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. 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. 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). 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. 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. | |||||||||
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