Multitone Siren Alarm circuit diagram
The circuit is built around popular CMOS oscillator-cum-divider IC 4060 and small audio amplifier LM386. IC 4060 is used as the multitone generator. A 100 H ind...
LPG Gas Leakage Sensor Alarm
This is the schematic diagram of LPG gas leakage sensor alarm. The circuit operates off a 9V PP3 battery. Zener diode ZD1 is applied to convert 9V into 5V DC to...
Flame gas and smoke detector
Flame, gas and smoke detector for fire alarm. You can combine this circuit with alarm circuit. The output will be the relay which switch on and switch off the a...
File Alarm with LDR Sensor
File alarm with LDR sensor. The sensitivity of the circuit is dependent upon the distance between bulb and LDR as well as setting of preset VR1. Thus by putting...
easy build motocycle alarm
The circuit just required 2 transistors to drive the relay the the relay act as a switch to activate the buzzer. Any number of normally-open switches may possib...
Easy Build Motorcycle Alarm
The following circuit is a simple, cheap and easy build motorcycle alarm. The circuit just required 2 transistors to drive the relay the the relay act as a swit...
Cheap Motorcycle Alarm
Cheap motorcycle alarm circuit. During parking, hidden switch S1 is normally open and will not permit triggering of MOSFET T1. But when somebody starts the moto...
motorcycle alarm series
This circuit is designed to create an early warning alarm system for any form of theft that are important to the owners of a motorcycle or bicycle. This alarm s...
Wireless Car Alarm circuit diagram
This circuit is a wireless car alarm system that is built using two circuit modules, namely modules of transmitter and receiver modules. This circuit works on F...
Transmitter Detector for FM Bug Surveillance
The circuit was constructed using a few components that is powered by a 9 V battery for sensing the presence of bugs transmitting within the frequency mod....
Tilt Sensor Alarm Circuit
Ultra simple circuit of the tilt sensor alarm presented here can be fabricated using readily available inexpensive components. The circuit is a true transi....
Siren Police Tone Circuit
Here is police tone circuit of siren. this simple and very easy to make it. vr 1 and vr 2 for change delay sound of siren. simple and easy. if sound output not....
Single Alarm Circuit
Here is single alarm circuit. The circuit features automatic exit and entry delays, timed bell cut-off and system reset. It has provision for normally open and....
Simple Touch Alarm circuit
Touch the sensor of the alarm with your finger and it starts beeping, goes on for some time and then stops. Touching it again, and it goes again! This litt....
Simple Electronic Combination Lock circuit diagram
This could be the circuit diagram of a easy electronic combination lock by using IC LS 7220. This circuit may be applied to activate a relay for controlling (on...
Simple Alarm circuit
A simple alarm circuit with diagram and schematic that generates multi tone sound. This alarm circuit is suitable to use in burglar alarms and sirens and is des...
Remote Controlled Alarm circuit
A very interesting remote controlled alarm circuit using TSOP1736. Routing of an electric cable to attach a calling bell switch near the bed of an old age/....
Remote Alarm For Smoke Detector
This alarm circuit was designed to monitor a mains-powered smoke detector located in a shed (which is used to house dog kennels). It provides complete isolation...
Power Resumption Alarm circuit
Here is a simple Power resumption alarm circuit that can be fixed inside the switch box itself. It gives beeps when the power resumes after a power failure....
Park Aid
This circuit was designed as an aid in parking the car near the garage wall when backing up. Electronics project and circuit diagram. Proximity sensor...