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cmos based single zone alarm – Circuit Schematic
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...
transistor based single zone alarm – Circuit Schematic
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 w...
expandable transistor based burglar alarm – Circuit Schematic
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...
expandable scr based burglar alarm – Circuit Schematic
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...
one time only burglar alarm – Circuit Schematic
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 ...
two zone burglar alarm – Circuit Schematic
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 detai...
doorbel – Circuit Schematic
doorbel
This smart doorbell system is designed for use in industrial environments. It is microcontroller based and controls a horn and a flash light.....
fire alarm installation – Circuit Schematic
fire alarm installation
Smoke and fire alarms are an important part of your home`s safety plan and careful attention must be made to proper fire alarm installation and wiring. The info...
doorbell wiring – Circuit Schematic
doorbell wiring
Instructions for wiring and installing a Doorbell in your home.....
Sensor Alarm using thyristor circuit – Circuit Schematic
Sensor Alarm using thyristor circuit
When you press sensor switch SW2, the LED D3 and the alarm switches ON for a while. The timing of the circuit is dependent upon R3 and C1. You can get all the d...
telephone taps – Circuit Schematic
telephone taps
About telephone tapping. TSCM bug sweeps telephone, computer data lines, and bug sweep offices to free them of electronic eavesdropping and wiretaps.....
Doorbell Phone – Circuit Schematic
Doorbell Phone
You could really use any phone for this project, so don`t worry if you can`t get or don`t want the same model as mine. If you do get an antique bakelite phone, ...
build yourself this simple sound activated alarm – Circuit Schematic
build yourself this simple sound activated alarm
The project” DIY: build sound activated switch” presented here is pretty easy to construct and can prove to be very useful in protecting a particula...
building and installing a emf home protection system – Circuit Schematic
building and installing a emf home protection system
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make yourself this low cost rfid access control circuit at home – Circuit Schematic
make yourself this low cost rfid access control circuit at home
Building a RFID access control circuit at home and seeing it actually work can be truly an amazing experience. Although the circuit is not a hi-tech one, but co...
build this versatile electronic combination lock part one – Circuit Schematic
build this versatile electronic combination lock part one
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securing home entrances with a simple circuit – Circuit Schematic
securing home entrances with a simple circuit
Certain circumstances and areas demand detection and securing of the entrances paths through alarm systems, so that the whenever an individual opens the entranc...
over voltage and low voltage protection circuits easy home projects – Circuit Schematic
over voltage and low voltage protection circuits easy home projects
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record telephone conversations by building this bugging equipment – Circuit Schematic
record telephone conversations by building this bugging equipment
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ultrasonic rat repellent – Circuit Schematic
ultrasonic rat repellent
Ultrasonic Rat Repellent circuit and Notes on ultrasonic experiments on rats.....