|
13 Color LED Rainbow |
|
4 Digit Keypad |
|
5 Zone Alarm Circuit |
|
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. |
|
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.. |
|
A CMOS Based Single Zone Alarm - This circuit
features automatic Exit/Entry delays, timed Bell
Cut-off and System Reset. It has provision for
normally-open and normally-closed switches and will
accommodate the usual input devices (Pressure Mats,
Magnetic Reed contacts, Foil Tape, PIRs and Inertia
Sensors) |
|
A CMOS Based Vehicle Anti-Theft Alarm - This car
alarm circuit features Exit and Entry delays, an
instant alarm zone, an intermittent siren output and
automatic Reset. By adding external relays you can
immobilize the vehicle and flash the lights. |
|
A CMOS Single Zone Intruder 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 |
|
A One-Time-Only Burglar Alarm - When this alarm
is activated its Siren will sound once, for up to
20-minutes. Then it will switch off and remain off.
The basic circuit has a single zone with
independently adjustable Exit and Entry delays. This
will be adequate in many situations. However,
there's also range of Expansion Modules. These will
allow you to add any number of Instant Zones, Tamper
Zones and Personal Attack Zones to your system. |
|
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. |
|
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. |
|
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. |
|
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" |
|
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. |
|
A Transistor Based Single Zone Alarm - The
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 the usual input devices
(Pressure Mats, Magnetic Reed contacts, Foil Tape,
PIRs and Inertia Sensors). |
|
Alarm control keypad |
|
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. |
|
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. |
|
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. |
|
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. |
|
An SCR Based Burglar Alarm |
|
Analog Video Router - Intersil Application Block
Diagram |
|
Anti Theft Motorcycle Alarm |
|
Anti-Bag-Snatching Alarm |
|
Anti-Theft Alarm for Bikes |
|
Anti-Theft Security for Car Audios |
|
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. |
|
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… |
|
Automatic Intruder Alarm |
|
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’ |
|
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. |
|
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. |
|
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. |
|
CMOS Based Motorcycle Alarm - This circuit
features automatic Exit/Entry delays, timed Bell
Cut-off and System Reset. It has provision for
normally-open and normally-closed switches and will
accommodate the usual input devices (Pressure Mats,
Magnetic Reed contacts, Foil Tape, PIRs and Inertia
Sensors). |
|
CMOS Based Vehicle Anti-Theft Alarm - This car
alarm circuit features Exit and Entry delays, an
instant alarm zone, an intermittent siren output and
automatic Reset. By adding external relays you can
immobilize the vehicle and flash the lights. |
|
Combination Digital Lock - A multiple input
combination lock using CMOS counter IC's.
Flexibility and code change is allowed by changing
output connections. |
|
Combination Lock PIC16F84 |
| Combination
Lock-Digital |
|
Cut Phone Line Detector (Aaron Cake) - Can be
used to alarm security system |
|
Cut Phone Line Detector (Tony van Roon) |
|
DayLight Alarm - The circuit presented here
wakes you up with a loud alarm at the break of the
daylight. Once again the 555 timer is used here. It
is working as an astable multivibrator at a
frequency of about 1kHz. The circuit's operation
can be explained as follows: When no light falls on
the LDR, the transistor is pulled high by the
variable resistor. |
|
Digital Combination Lock |
|
Digital Electronic Lock (Bill Bowden) - The
digital lock shown below uses 4 common logic ICs to
allow controlling a relay by entering a 4 digit
number on a keypad. The first 4 outputs from the
CD4017 decade counter (pins 3,2,4,7) are gated. |
|
Door/Window Sensor Resists Tampering - EDN-Design
Ideas: The simple, inexpensive circuit in Figure 1
detects a failure (or deliberate tampering) on lines
connected to normally closed switch sensors. For
example, common door interlocks and door/window
sensors consist of normally open or normally closed
magnetic reed switches. Depending on the monitoring
configuration, an open or short on a line may go
undetected, thus preventing alarm activation.
Embedding a resistor in a normally closed sensor and
using bipolar dc power supplies produces the
balanced configuration in Figure 1. A short or open
on a line (or sensor activation) produces a net
positive or negative voltage at the input of the
Q1-Q2 pair. |
