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Third brake light pulser circuit - . . .
Transistor Based Motorcycle Alarm - This circuit features a timed output and automatic reset. It can be operated manually using a
key-switch or a hidden switch. By adding an external relay, it will set itself automatically, and/or immobilize the machine,
every time you turn-off the ignition. It's easily adapted for a 6-volt system, so it will protect your "Classic Bike". . .
[Ron J.'s circuit]
Travel Touch Alarm - The Travel Touch Alarm can be used to provide a audible alarmwhen someone touches the door knob
or handle of your hotel room. The door knob or handle must be made of metal for the circuit to work. The main chip in the
circuit is a 555 timer. . . . [Circuit design by Randy Linscott]
Two CMOS Based Vehicle Anti-Hijack Alarms - The first circuit is designed for the situation where a hijacker forces the driver from the
vehicle. If a door is opened while the ignition is switched on - the circuit will trip. After a few minutes delay - when the
thief is at a safe distance - the alarm will sound and the engine will fail. The second circuit is a modification of the
first - offering enhanced protection in many more situations. . . . [Ron J.'s circuit]
Two Simple Relay Based Motorcycle Alarms - These are two - easy to build - relay-based alarms. You can use them to protect your motorcycle
- but they have many more applications. If you use relays with 6-volt coils - they'll protect your "Classic Bike". Both
alarms are very small. The completed boards occupy about half a cubic-inch - 8 cc. The standby current is zero - so they
won't drain your battery. . . . [Ron J.'s circuit]
Two
Speed Pulse Wiper Control 1 - STMicroelectronics-Application. . .
Two
Speed Pulse Wiper Control 2 - STMicroelectronics-Application. . .
Two-Zone Burglar Alarm - This two-zone alarm has automatic exit, entry and siren cut-off timers. It was developed for
the Beginner's Guide To Cmos Timers. So it has a particularly detailed circuit description. There's an optional One-Time-Only
module. It will force the siren to switch off after the first ten minutes - and prevent the alarm from activating a second
time. . . . [Electronic design by Ron J.]
Ultrasonic Parking Assistant - The basic theory behind the Parking Assistant is the Sound Navigation and Ranging (SONAR)
technique that is used for finding the distance and direction of a remote object underwater by transmitting sound waves and
detecting reflections from it. First, a series of short ultrasonic pulses are transmitted using a transducer that changes
voltage into sound waves. The transmitted pulse is reflected off an object, and the reflected wave is then received by
another transducer that converts sound waves into voltage. The transmitted signal is also known as the ‘ping’ and the
received signal is known as the ‘pong’. By counting the elapsed time between the ping and the pong, the distance between the
device and an object can be easily calculated by multiplying the elapsed time with the speed of sound. . . .
Ultrasonic Parking Sonar - This was one
of my first designs: it is an ultrasonic parking sonar. Based on an ultrasonic amplifier from an article seen on a 1982
magazine, it was once installed on the rear bumper of my Volvo Station Wagon. It served very well for many years. Connecting
it to the reverse gear lights, it switches on automatically and shows you the distance to the nearest obstacle (according to
his beam) on a led scale. When the last led lights, a buzzer is also activated telling you to stop immediately. . . [Alberto
Ricci Bitti's web site]
Ultrasonic parking sonar electronic using transistors and 4000 series CMOS - . . . [Alberto Ricci Bitti]
Ultrasonic ParKontroller - Are you afraid
that your brand new Hummer is going to get scratched while parking it in a tight space?Do you have trouble backing your large
Mercedez S-class into your small garage?Fear no more!Our ultrasonic ParKontroller can sense how far you are away from the
wall. . . [by Chris Chan and Kenneth Liu]
Ultrasonic radar - This is a very
interesting project with many practical applications in security and alarm systems for homes, shops and cars. It consists of
a set of ultrasonic receiver and transmitter which operate at the same frequency. When something moves in the area covered
by. . .
Unbalanced Automotive or Consumer
Application - AS001 Application Note. Isolation transformer box for
unbalanced consumer audio line signals (app note 08/08/08) . . . [Jenson Transformers]
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