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.

Power-line failure indicator uses three LED's to indicate if a power outage has occured and of what duration.
BYTE Nov 1980 (v.5#11) pg. 86

Add a power-failure sensor to any ac digital clock. After a power failure, the circuit will "beep" until you reset the clock.
COMPUTERS & ELECTRONICS Sep 1983 (v.21#9) pg. 79

Electronic circuit will signal with LEDs just how long a power failure has lasted. Unit is reset via a push button. Battery powered.
CQ. THE RADIO AMATEUR'S JOURNAL Feb 1979 (v.35#2) pg. 99

Power failure alarm will sound a battery-operated buzzer and turn on a signal light if power to some device fails. Est. cost: $10.
ELEMENTARY ELECTRONICS Mar-Apr 1974 (v.14#2) pg. 65

Alarm circuit will indicate if a power supply has failed.
HANDS-ON ELECTRONICS Jul 1987 (v.4#7) pg. 93

Tip: Use a night light to signal when important electric outlets are inoperative.
HOMEOWNER Dec 1989 (v.14#10) pg. 75

Warning light to indicate if electric power to food freezer has been cut off.
MECHANIX ILLUSTRATED #477 Feb 1968 (v.64) pg. 96

Circuit for a power failure detector. When power fails, an alarm will sound and from one to four LEDs will light, depending on the length of outage.
MODERN ELECTRONICS [1] Mar 1978 (v.1#2) pg. 67

Blackout/brownout alarm. Sounds a buzzer when AC line power drops below a certain level.
MODERN ELECTRONICS [2] Aug 1989 (v.6#8) pg. 39

Power-failure alarm sounds a buzzer if the AC power fails.
MOTHER EARTH NEWS #84 Nov-Dec 1983 pg. 137

Power failure alarm does not use an auxiliary power source (such as battery) to sound alarm when electric power fails.
POPULAR ELECTRONICS [1] Feb 1968 (v.28#2) pg. 43

Build an AC power line monitor which will sound an alarm if power goes off. Est. cost: $8.
POPULAR ELECTRONICS [1] Oct 1974 (v.6#4) pg. 36

Power-failure alarm. NiCd powered unit with built-in trickle charger, sounds an alarm if the power goes off. Alarm continues to sound until reset. Thus, you know that a failure occured even if you were not home.
POPULAR ELECTRONICS [1] Jun 1976 (v.9#6) pg. 55

Power-failure alarm circuit resets itself when power returns.
POPULAR ELECTRONICS [2] Jul 1991 (v.8#7) pg. 22

AC line monitor will let you know if the power failed.
POPULAR ELECTRONICS [2] Jul 1992 (v.9#7) pg. 72

Voltage monitor and detector circuits. (1) Glitch detector monitors a DC-voltage for a change (glitch) which can cause problems in a computer. (2) AC noise detector. (3) AC power-failure monitor checks for voltage glitches or failures.
POPULAR ELECTRONICS [2] Oct 1994 (v.11#10) pg. 82

Battery operated power failure alarm. Buzzer sounds if power fails. Unit resets itself when power is restored. Est. cost: $4.
POPULAR MECHANICS Oct 1966 (v.126#4) pg. 200

Alarm rings if temperature inside a food freezer exceeds a preset limit or if electrical power fails.
POPULAR SCIENCE Mar 1972 (v.200#3) pg. 112

Table lamp has a power fail alarm built into its base. Powered by a six-volt battery, the alarm rings a bell and can also turn on a 6-volt light bulb.
POPULAR SCIENCE May 1975 (v.206#5) pg. 138

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