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Security Circuits - including Burglar Alarms,  Page 1
Security Burglar Alarms:  #'s - B     C - D     E - G      H - L       M - O      P - R        S     T - Z
Last Updated on:
Tuesday, April 01, 2014 04:29 AM
 


Links to electronic circuits, electronic schematics, designs for engineers, hobbyists, students & inventors:

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]
4 Digit Keypad -  (Circuit design added 8/03)
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]
5 Zone Alarm Circuit -  (design circuit added 8/02)
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]

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.]
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.]
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.]
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.]
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.]
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.]
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.]
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.]
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.]
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.]
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
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.]
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)
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]
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]
An SCR Based Burglar Alarm -  (electronic design added 6/07)
Analog Video Router -  Intersil Application Block Diagram....[App Note]
Anti Theft Motorcycle Alarm -  (electronic design added 9/02)
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…. [Peter Jakab, Electrical Engineer, Engineer of Informatics]
Automatic Intruder Alarm -  Circuit designed by Ron J (electronic design added 6/07)
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)
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)
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)

Security Burglar Alarms:  #'s - B     C - D     E - G      H - L       M - O      P - R        S     T - Z



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