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Security Circuits
- including Burglar Alarms, Page 8
Security Burglar Alarms: #'s - B
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Last Updated on:
Thursday, April 19, 2012 06:22 AM
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| Circuits
Designed by Dave Johnson, P.E. : |
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Wire Security Loop Alarm
A wire loop is used to protect valuable objects in this alarm circuit. The
circuit is powered by a 9v battery.
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Links to electronic
circuits, electronic schematics, designs for engineers, hobbyists, students &
inventors:
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Theft preventer alarm - This circuit utilising a 555 timer
IC can be used as an alarm system to prevent the theft of your
luggage, burglars breaking into your house etc. The alarms goes ON
when a thin wire, usually as thin as a hair is broken....(electronic
design added 08/08/08) |
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Timed Burglar Alarm - This is a simple but effective alarm
circuit which can reset its self after a time that you select. it has
normally open and normally closed triggers which make this circuit
very practical. This alarm has normally open and normally closed
triggers. It's on a 555 timer ....(added 11/06) |
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TinyTwo Zone Alarm - (circuit / schematic added 2/03)
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Touch Activated Alarm - Not much to tell here as the circuit
speaks for itself. The 555 can be almost any type, they are all
pin-compatible. Although some CMOS types may not have enough power to
drive.... [Tony van Roon's circuit] |
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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
.... (Circuit design added 08/08/08) |
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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. |
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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. [Ron J.'s desoign] |
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Ultrasonic Remote Control & Alarm - (Circuit design added
8/03) |
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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…. [Circuit Designed by Ron J.] |
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Voltage Protection - Safety devices like fuses provide
protection against excess current, but do nothing for transients and
short duration spikes of high voltage on the power supply lines.
This circuit uses the "crowbar"....[by Andy Collison] |
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Water Level Indicator with alarm - This circuit not only indicates the
amount of water present in the overhead tank but also gives an alarm when the tank
is full. The circuit uses the widely available CD4066, bilateral switch CMOS
IC to indicate the water level through LEDs. When the water is empty the wires in
the tank are open circuited and the 180K resistors pulls the switch(added 10/05) [Radioland.nt.au] |
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Whistle Responder - Beeps when hears your whistle A gadget suitable for
key-holders, games etc..... |
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Wire Loop Alarm - This circuit is a simple wire loop alarm that can be
used in doorways, hallways, or any other place the tripwire will be broken by
intruders. The circuit has a built in siren, but it can be replaced by a relay to
drive an external siren, commercial alarm, etc.... [Circuit designed by Aaron
Cook] |
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Wire Security Loop Alarm - A wire loop is used to protect valuable
objects in this alarm circuit. The circuit is powered by a 9v battery.
[Designed by David A. Johnson] |
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Wireless Home Security Implementing KEELOQ® & the PICmicro® MicroController -
Microchip Application Note Published 12-Oct-99 (app note added 2/06)
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Wireless Monitoring System - Circuit Cellar June 2004, Issue 167
-- One of the things I have learned from my everyday engineering practice is
that there is always room for ingenuity and improvement. This is
particularly true for this project, which applies a couple of inexpensive
microcontrollers to an unusual device: a live-catch mousetrap. |
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Security Burglar Alarms: #'s -
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