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Digital code lock – Circuit Schematic
Digital code lock
This is a simple but effective code lock circuit that has an automatic reset facility. The circuit is made around the dual flip-flop IC CD4013. Two CD 4013 ICs ...
Dark detector circuit – Circuit Schematic
Dark detector circuit
The dark detector circuit shown here can be used to produce an audible alarm when the light inside a room goes OFF. The circuit is build around timer IC NE555. ...
Fire Alarms Circuit-Diagram-Smoke-Home-Security-Alarms – Circuit Schematic
Fire Alarms Circuit-Diagram-Smoke-Home-Security-Alarms
Many fire alarm circuits are presented here, but this time a new circuit using a thermistor and a timer to do the trick. The circuit is as simple and straight f...
Electronic Keys and Locks Circuits-Digital Code Locks-Combination and Transistor Code Locks – Circuit Schematic
Electronic Keys and Locks Circuits-Digital Code Locks-Combination and Transistor Code Locks
Circuit diagram schematics of Electronic Keys, Electronic Locks,Digital Electronic Locks,Transistor Code Locks,Combination Electronic Locks.....
Cat Repeller CircuitRepellentCircuit555 Ultrasonic Circuit – Circuit Schematic
Cat Repeller CircuitRepellentCircuit555 Ultrasonic Circuit
With this cool cat/dog repeller circuit you could chase the cats off from any where you want. In fact, I designed this circuit to chase my cat from my computer ...
Simple Over Voltage Protection Circuit: High Voltage Cut Off – Circuit Schematic
Simple Over Voltage Protection Circuit: High Voltage Cut Off
Voltage fluctuation is a serious issue in every home. Due to some reasons our supply voltage may rise above 110V or 230V. Flow of this high electricity may lead...
Home security alarm system circuit diagram – Circuit Schematic
Home security alarm system circuit diagram
Have you ever thought aboutimplementing your own home security alarm systems It`s one of the simplest and interesting circuits for electronic beginners. Our new...
Water tank overflow liquid level sensor alarm circuit – Circuit Schematic
Water tank overflow liquid level sensor alarm circuit
Water tank overflow liquid level sensor alarm circuit is a simple electronics project for school students. In the previous articles we had discussed about numer...
Mobile cell phone detector (sniffer) circuit diagram: engineering and diploma project – Circuit Schematic
Mobile cell phone detector (sniffer) circuit diagram: engineering and diploma project
Here is a simple engineering project circuit of handy mobile cell phone detector (sniffer). This pocket-sizedmobile communication detector or sniffer can sense ...
Gas Leakage Sensor Alarm Circuit Engineering Project using 555 Timer and MQ6 SEN 1327 Gas Sensor Module – Circuit Schematic
Gas Leakage Sensor Alarm Circuit Engineering Project using 555 Timer and MQ6 SEN 1327 Gas Sensor Module
In this article we will be discussing about a home security alarm circuit. This is a LPG gas leakage sensor circuit that detects the outflow of LPG gas and aler...
Cmos Based Vehicle Anti-Theft Alarm – Circuit Schematic
Cmos Based Vehicle Anti-Theft Alarm
This circuit features automatic exit and entry delays - an optional instant alarm zone - an optional intermittent siren output - and an automatic reset. By addi...
Electronic 7-Digit Combination Lock – Circuit Schematic
Electronic 7-Digit Combination Lock
This 7-digit combination lock can be easily hard-wired for any combination that you choose. The circuit uses a 4-bit, divide-by-8 Johnson counter (IC1), ten pus...
Infrared Proximity Detector Alarm – Circuit Schematic
Infrared Proximity Detector Alarm
This circuit can be built from readily available low-cost components, some of which may even be hiding in your junkbox! The indicated value of 22 for resistor ...
General-Purpose Alarm – Circuit Schematic
General-Purpose Alarm
The alarm may be used for a variety of applications, such as frost monitor, room temperature monitor, and so on. In the quiescent state, the circuit draws a cur...
Cat and Dog Repeller – Circuit Schematic
Cat and Dog Repeller
Nowadays, just about every house has an outside lamp with a motion sensor. Such a device eliminates the need to feel your way to the front door, and it apparent...
Alarms and security related schematics – Circuit Schematic
Alarms and security related schematics
The High Power Amplifier has great advantages are 5000W ultra-light, high-power audio amplifier, without switching-mode power supply. This ambit is of an 2 x 2,...
Alarm – Circuit Schematic
Alarm
This is a simple and easy to build multi tone alarm circuit that can be used in burglar alarms or sirens. The circuit is based on dual op-amp MC1458 and LM 380....
Schematics Touch Activated Alarm – Circuit Schematic
Schematics Touch Activated Alarm
C1/C2`s working voltage ought to be elevated to 25V in the event you decide to go with a 12V power source. Rule of thumb: the operating voltage of capacitors ar...
Proximity Detector Circuit Using NE555 PCB – Circuit Schematic
Proximity Detector Circuit Using NE555 PCB
This post shares a proximity detector circuit comprising mainly NE555 IC. This circuit can be used for burglar alarms based on beam interruption, with the added...
Motion Sensor For Security Light Using PIR BS1600 PCB – Circuit Schematic
Motion Sensor For Security Light Using PIR BS1600 PCB
Here`s the circuit diagram based on PIR motion sensor module BS1600 (or BS1700) that can be used for security lighting in power saving mode. (If you could not f...