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3 Zone Duress Alarm - This is a 3 zone alarm for use in high
risk areas or possible duress situations. Typical examples being banking
or betting booths. The alarm consists of 3 normally open push button
switches which can be hidden or in plain view. Once pressed the alarm will
latch and a LED will light showing which zone has pressed the alarm....
[Circuit by Andy Collison] |
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4 Digit Keypad - (Circuit design added 8/03) |
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4 in 1 Burglar Alarm - In this circuit, the alarm will be
switched on under the following four different conditions: 1. When light
falls on LDR1 (at the entry to the premises). 2. When light falling on
LDR2 is obstructed. 3. When door switches are opened or a wire is broken.
4. When a handle is touched. The light dependent resistor LDR1 should be
placed in darkness near the door lock or handle etc. If an intruder
flashes his torch.... [Radioland.nt.au] |
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5 Zone Alarm Circuit - (design circuit added 8/02) |
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6 Zone Alarm with 7 Segment Display - This alarm system has 6 independent
zones, 1 timed entry/exit zone, a 7 segment LED display and a test or walkthrough
facility. Suitable for a small office or home environment, it can also be adapted to
use a combination lock or keypad to set and reset the alarm.... [Andy Collison,
designer] |
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A CMOS 4060 Burglar Alarm - This is a single zone alarm, with automatic
exit, entry and siren cut-off timers. It will accommodate all the usual types of
normally-closed input devices, such as magnetic reed contacts, foil tape, PIRs etc.
But it's easy to add a normally-open trigger.... [Design by Ron J.] |
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A CMOS Based Motorcycle Alarm - This circuit features an
intermittent siren output and automatic reset. It can be operated manually
using a key-switch or a hidden switch; but it can also be wired to set
itself automatically when you turn-off the ignition.… [Design by Ron J.] |
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A CMOS Based Single Zone Alarm - This circuit features automatic
Exit and Entry delays, timed bell cut-off, and system reset. It has
provision for normally-open and normally-closed switches, and will suit all
of the usual input devices (Pressure Mats, Magnetic Reed contacts, Foil
Tape, PIRs and Inertia-Sensors, see.... [Design by Ron J.] |
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A One-Time-Only Burglar Alarm - This alarm is designed to sound
its Siren only once. That is - when the alarm is activated - the Siren will
sound for a preset length of time. Then it will switch off and remain off.
The alarm will not re-activate. [Circuit designer is Ron J.] |
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A Shed / Garage Alarm -
This is a basic single-zone burglar alarm circuit. Its features include automatic Exit
and Entry delays. It has an extremely small standby current. This makes it ideal
for battery-powered operation. Use it in your caravan, mobile home, lock-up, or
anywhere mains power is not available.... [Circuit by Ron J.] |
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A Simple Fire-Door Alarm -
This circuit will let you know when something that should be kept closed, has in fact
been left open. Attach it to a Fire-Door. It will allow you to pass through the door
as usual. However, if it's left open for more than 30-seconds or so, the buzzer will
sound.... [Circuit by Ron J.] |
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A Simple Shop-Door Alarm - Attach this circuit to the door of an unattended
shop, or reception area, and the sound of the buzzer will tell you when you have a
customer. Add a siren, and it becomes a simple intruder alarm…. [Design by Ron J.] |
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A Simple Transistor Based Motorcycle Alarm - This is an even simpler
transistor based motorcycle alarm. The 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".... [Design by Ron J.] |
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A Simpler CMOS Single Zone Alarm - This circuit features automatic
Exit/Entry delays, timed Bell Cut-off and System Reset. It will accommodate the usual
normally-closed input devices (Magnetic Reed contacts, Micro Switches, Foil Tape and
PIRs). And, with a simple modification, a normally-open trigger may be added....
[Design by Ron J.] |
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A Transistor Based Single Zone 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".... [Circuit Designed by Ron
J.] |
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Alarm control keypad - The IC is a quad 2 input "AND" gate, a CMOS 4081.
These gates only produce a HIGH output, when BOTH the inputs are HIGH. When the key
wired to 'E' is pressed, current through R1 and D1 switchs Q5 on.The relay energises;
and Q5 is 'latched on' by R8. Thus, the Alarm is set by pressing a single key,say one
of the two non-numeric symbols.... [Ron J.'s circuit |
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An Enhanced Shed / Garage Alarm - This is an enhanced version of the simple
Garage/Shed Alarm. The Entry and Exit delays have been increased to about 30-seconds,
and I've added a timed Siren cut-off and automatic Reset. I've also replaced the LED
with an entry Buzzer. These enhancements mean that the new version will have a much
wider application.... [Circuit by Ron J.] |
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An Expandable Multi-Zone Modular Burglar Alarm - This circuit features
automatic Exit and Entry delays and a timed Bell Cut-off. It has provision for both
normally-closed and normally-open contacts, and a 24-hour Personal Attack/Tamper zone.
By using the Expansion Modules, you can add as many zones as you require; some or all
of which may be the inertia (shock) sensor type. (Circuit design added 04/05/06)
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An Expandable SCR Based Burglar Alarm - This is a simple SCR based burglar
alarm circuit. Its features include automatic Exit and Entry delays, together with a
timed Bell Cut-off and Reset. The basic alarm has a single zone. This will be
adequate in many situations. However, the modular design means that you can add as
many zones as you like to the system. Details of a Four-Zone expansion module are
provided.... [Ron J.'s circuit] |
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An Expandable Transistor Based Burglar Alarm - This transistor based alarm
features automatic Exit and Entry delays, together with a timed Bell Cut-off and
system Reset. Along with the Exit/Entry zone, the basic alarm board has one Instant
Zone. This will be adequate in many situations. However, the modular design
means that it's easy to add as many zones as you like to the system. Details of a
Four-Zone expansion module are provided.... [Ron J.'s circuit] |
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An SCR Based Burglar Alarm - (electronic design added 6/07) |
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Analog Video Router - Intersil Application Block Diagram....[App Note]
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Anti Theft Motorcycle Alarm - (electronic design added 9/02) |
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Anti-Bag-Snatching Alarm - .... |
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Anti-Theft Alarm for Bikes - .... |
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Anti-Theft Security for Car Audios - .... |
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Auto Burglar Alarm (Randy Linscott) - This alarm circuit is based on two 555
timers. The alarm will sound your car horn if anyone opens the car door while the
circuit is armed. The timers will allow you to leave the car without sounding the
horn. To turn the circuit on S1 must be closed.…. |
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Automatic Door Opener with PIC12c508 - This circuit can be used to operate
an electric strike or an electromagnetic lock on a door. It is not door being
opened/closed, but a small electromagnetic strike which unlocks door…. [Peter
Jakab, Electrical Engineer, Engineer of Informatics] |
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Automatic Intruder Alarm - Circuit designed by Ron J (electronic design
added 6/07) |
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Automatic Room Lights - An ordinary automatic room power control circuit has
only one light sensor. So when a person enters room it gets one pulse and
lights come ‘on.’ When person goes out it gets anor pulse and lights go
‘off.’ But what happens when two persons enter room, one after or? It gets
two pulses and lights remain in ‘off’(added 10/05) |
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Battery-Powered One-Time-Only Burglar Alarm - This is a single zone alarm,
with independently adjustable Exit, Entry and Siren Cut-Off timers. When the alarm is
activated its Siren will sound once, for up to 20-minutes. Then it will switch off and
remain off. If you wish, you can use a mains power supply. But the extremely low
standby current makes battery power a realistic option. (Circuit design added
08/08/08) |
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Build yourself a Witness Camera - The Witness Camera is an automated,
self-recording surveillance camera, that uses a gigabyte-class flash card as recording
media. I designed the Witnesscam because available surveillance solutions were too
expensive or impractical for home use. I built the system from a VGA CMOS colour
camera, a passive-infrared (PIR) movement sensor, an ATmega32 processor, and a 1GB
SD-card....(design added 06/05) |
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