Advertisement
Downed Model Locator II – Circuit Schematic
Downed Model Locator II
...
laser security system – Circuit Schematic
laser security system
A simple and cheap Laser Based Security System, which costs below Rs. 100. It is a simple circuit using LM358 OP-AMP and LM555 Timer. This circuit is triggered ...
110dB Beeper Circuit – Circuit Schematic
110dB Beeper Circuit
This beeper circuit will generate an car-splitting 110dB from 9V. The setup uses a single 74C14 (CD40106B) CMOS hex inverting Schmitt-trigger IC, which must be ...
Spy RF Bug Detector Circuit – Circuit Schematic
Spy RF Bug Detector Circuit
Here is a simple RF bug detector that will help you detect spy bugs and can operate up to 2 GHz. Below are some essential things required for this circuit:.....
PIC Based Security Alarm Project – Circuit Schematic
PIC Based Security Alarm Project
Crime in general is still on the rise, and having a security alarm installed is no longer a perquisite of the wealthy! Here is a simple and compact securit.....
Electronic Key Circuit – Circuit Schematic
Electronic Key Circuit
Based on CD4017 and logic gates this electronic circuit switches on a relay if you press four keys in the correct sequence, and backs to the start conditio.....
Arduino Panic Alarm Project – Circuit Schematic
Arduino Panic Alarm Project
Here is the circuit of an Arduino-based Panic Alarm! The wiring is very simple so that even a novice can construct this interesting circuit without any difficul...
Light Activated Relay with 555 Circuit – Circuit Schematic
Light Activated Relay with 555 Circuit
This light activated relay circuit presented here uses the 555 timer IC and a light dependent resistor or LDR to form a light sensitive relay in an intruder ala...
PIR LED Security Light Circuit – Circuit Schematic
PIR LED Security Light Circuit
Here is one simple circuit of a general-purpose white LED security light with Passive Infrared (PIR) Motion sensing mechanism. At the heart of the circuit is a ...
clap switch schematic image – Circuit Schematic
clap switch schematic image
...
Shadow Sensor Alarm – Circuit Schematic
Shadow Sensor Alarm
Shadow sensors are widely used to detect the movement of a person in a confined area. Many circuits published earlier have a serious drawback that only one.....
Smoke Alarm Circuit – Circuit Schematic
Smoke Alarm Circuit
The original smoke alarm circuit has some problems and has left some hobbyists and students disappointed. Rather than to attempt to solve its many problems, I h...
Photoelectric Smoke Detector – Circuit Schematic
Photoelectric Smoke Detector
This photoelectric smoke detector circuit uses one LED and 2 LDRs to detect the smoke and sound an alarm. The LM1801 IC is the best choice for this circuit.....
Infrared Alarm Barrier Circuit – Circuit Schematic
Infrared Alarm Barrier Circuit
This infrared alarm barrier can be used to detect persons passing through doorways, corridors and small gates. The transmitter emits a beam of infrared light wh...
Bicycle Anti-Theft Alarm Project – Circuit Schematic
Bicycle Anti-Theft Alarm Project
I hate to suggest the specific application `bicycle` because it may be use to protect many items from theft. This anti-theft alarm project is built around.....
Door Ajar Light Flasher – Circuit Schematic
Door Ajar Light Flasher
A magnet is placed on the door and a magnetic reed switch on the door casing so when the door is closed the circuit is disabled. When the door is open, the.....
Overheat Detector Alarm Switch – Circuit Schematic
Overheat Detector Alarm Switch
The circuit is a precision integrated temperature sensor type LM35 (IC1), which provides an accurately linear and directly proportional output in mV, over the z...
Security Light & Switch with PIR Sensor Update – Circuit Schematic
Security Light & Switch with PIR Sensor Update
This is a simple update to Mr. Hareendran`s PIR Sensor Security Light circuit. It has a shortcoming limits the relay voltage to approximately 3. 3V. While this ...
Gas Leak Detector Circuit – Circuit Schematic
Gas Leak Detector Circuit
A gas leak detector circuit that detects the leakage of LPG gas and alerts the user through audio-visual indications. The circuit operates off a 9V PP3 battery....
Light Alarm Circuit with LDR – Circuit Schematic
Light Alarm Circuit with LDR
This musical light alarm circuit is very simple, uses only 7 components, a LDR and a 3. 6 V battery or 3 x 1. 2 volts rechargeable batteries. The well-known UM6...