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.

How to build an automobile back-up alarm. Sounds a beep whenever you are backing up your car.
CQ. THE RADIO AMATEUR'S JOURNAL Jun 1981 (v.37#6) pg. 54

Back-up beeper sounds a loud audible beep whenever your put your car in reverse.
HANDS-ON ELECTRONICS Jun 1987 (v.4#6) pg. 97

Automotive back-up alarm sounds an audible warning to pedestrians and other motorists when you put your vehicle in reverse.
MODERN ELECTRONICS [2] Sep 1988 (v.5#9) pg. 40
Correction MODERN ELECTRONICS [2] Nov 1988 (v.5#11) pg. 4

Car back-up alarm. Sounds an audible alert to warn pedestrians and other drivers when you move your car in reverse gear.
MODERN ELECTRONICS [2] Oct 1989 (v.6#10) pg. 33
Correction MODERN ELECTRONICS [2] Jan 1990 (v.7#1) pg. 7

Circuit for a turn and back-up alarm uses the car's horn as a loudspeaker to sound the warning.
POPULAR ELECTRONICS [2] Jan 1990 (v.7#1) pg. 25

Backing-up alarm uses the brake lights to trigger the alarm on and off.
POPULAR ELECTRONICS [2] Nov 1990 (v.7#11) pg. 24

Backing-up warning beeper for an automobile.
POPULAR ELECTRONICS [2] Feb 1991 (v.8#2) pg. 27

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