ELECTRIC POWER-FAILURE ALARM
sa VOLTAGE MONITOR
x POWER-FAILURE ALARM (ELECTRIC)
xx ALARM & SIREN
xx ELECTRIC
xx VOLTAGE MONITOR
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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