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PIR. motion sensor alarm circuit – Circuit Schematic
PIR. motion sensor alarm circuit
A motion detection alarm circuit using a PIR.SENSOR motion detection, if the move is a positive light from the PIR sensor, triggered by a delay circuit, Q1 and....
most common emergency sirens circuits – Circuit Schematic
most common emergency sirens circuits
The siren circuit is what importance in various alarm. For example : the emergency alert, burglar alarm circuits, Fire alarm circuits, Timer, sensor controls, e...
Key code lock switch circuit – Circuit Schematic
Key code lock switch circuit
This key code switch circuit is a type of electronic circuit that is created to replace conventional normal key switch. Without inserts a keys. But you can.....
High power siren circuit using CD40106 – Circuit Schematic
High power siren circuit using CD40106
This is asimple siren sound that high power output and very noisy. ICs, Digital ICs are easy to use number CD4046 Inverter circuit and four transistor power inc...
Four sirens sound with ic UM3561 – Circuit Schematic
Four sirens sound with ic UM3561
Operation of the circuit uses a UM3516 IC IC1 number ready to create a sound all four sound at pin 7, 8 of IC1 to the R1, VR1 to take to control the frequency.....
Ambulance sirens circuit – Circuit Schematic
Ambulance sirens circuit
This circuit is a circuit that sounds a siren-like sound of ambulance sirens. This circuit is different to an ambulance siren circuit generally, is to use.....
Dummy Alarm Project – Circuit Schematic
Dummy Alarm Project
The 7555 timer IC used is a low power version of the standard 555 timer. A ‘superbright red LED is used because this provides a bright flash with a low cu...
Water Alarm Circuit – Circuit Schematic
Water Alarm Circuit
This circuit gives out an alarm when its sensor is wetted by water. A 555 astable multivibrator is used here which gives a tone of about 1kHz upon detecting wat...
circuit alarm – Circuit Schematic
circuit alarm
You can do it with a couple of twin-T oscillators, with the Q set to the edge of oscillation, thus they ring like a bell when kicked  with a voltage pulse: Us...
mcus for a gas leak alarm – Circuit Schematic
mcus for a gas leak alarm
When a gas leak occurs, a gas leak alarm must detect the problem immediately and issue an alarm. The gas detection sensor typically used in these types of alarm...
Water Level Alert – Circuit Schematic
Water Level Alert
This circuit will emit an intermittent beep (or will flash a LED) when the water contained into a recipient has reached the desired level. It should be mounted ...
Water AlarmCircuit – Circuit Schematic
Water AlarmCircuit
Have you ever seen the stairs to one of the upper stories in your house turn into a waterfall? Or maybe you ve come home to find your aquarium fish trying.....
Under-Over-Voltage Beep for Manual Stabiliser – Circuit Schematic
Under-Over-Voltage Beep for Manual Stabiliser
Manual stabilisers are still popular because of their simple construction, low cost, and high reliability due to the absence of any relays while covering.....
Time Switch – Circuit Schematic
Time Switch
This circuit is especially designed for those who often need to wake up early in the morning. Ordinary alarms in electronic watches are not loud enough an.....
Tablet Reminder Uses Watch Module – Circuit Schematic
Tablet Reminder Uses Watch Module
This device is used as a reminder to take medicine every day. This device actually contains a crystal watch and a 4001 quad 2-input NOR gate with two of the gat...
Solar Powered Animal Scarer – Circuit Schematic
Solar Powered Animal Scarer
Here is a solar powered Flasher to scare away the nocturnal animals like bats and cats from the farm yard or premises of the house. The brilliant multicol.....
Smoke Alarm Battery Life Extender – Circuit Schematic
Smoke Alarm Battery Life Extender
While smoke alarms are quite cheap devices, the cost of 9V batteries quickly exceeds their purchase price. Added to that is the irritation of random beeps.....
Slave Flash Trigger – Circuit Schematic
Slave Flash Trigger
Using any camera in a dull or dark environment generally requires the use of supplementary light. This is a standard technique, and even where adequate na.....
Simple Knock Alarm With Piezo Sensor – Circuit Schematic
Simple Knock Alarm With Piezo Sensor
This circuit uses a thin piezoelectric sensor to sense the vibrations generated by knocking on a surface; eg, a door or table. Basically, it amplifies and.....
Simple Combination Lock – Circuit Schematic
Simple Combination Lock
This simple combination lock accommodates codes from 1-9 digits long, with the only restriction being that the same digit cannot be used twice. The circui.....