The following article discusses a few very simple intrusion detector circuits, or simply burglar alarm circuits. The presented designs are simple yet extremely effective with the functions. The triggering stage may consist of a voltage/current amplifier stage rigged with a relay driver stage along with a timer stage for keeping the triggering swit
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ched ON even after the threat is eliminated, for increased safety. Generally PIR sensorswhichwork bydetectingbody warmth are incorporated in most hi-end types of burglar alarms, however here well try to implement reasonably similar results yet use ordinary arrangements for the sensor stage in the proposed circuits. This is probably the simplest one among all. As shown in the diagram, the sensor is an ordinary thin wire conductor which is laid across therestrictedarea in such a way that anybody intruding the place gets caught up against the conductor and in the course breaks it up. Theentiresystem may be fixed over the door or therestrictedentrance. If an intruder tries to break in, the door would be disturbed instantly activating the connected piezo sensor, and theprecedingalarm circuit. This toy laser beam can be effectively implemented as an alarm sensor. As shown in the figure, the restricted area may be swarmed by laser beams reflectedacrossthe area via accurately angled mirrors. The final reflection gets directed toward an LDR trigger circuit. In case an intruder tries to trespass the premise, the person would block at least one of the reflections, interrupting the laser passage over the LDR.
This project fits more for custom made battery casing that can have more space to hide things inside. This switch with few alterations can be used for any other project as well but is designed based on e-bike needs! This project use a clever functionality of....
The circuit described here uses ultrasonic oscillations and operates based on the propagation velocity of these oscillations in the air. Thus, we can easily determine the distance of two points if the time within which the wave travels this distance is....
Sometimes the precious metals are hidden too deep and are not detected except with complicated devices. In many cases, however, small pieces of precious metal buried near the surface can be detected by relatively simple means. Everyone is very attractive to....
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The principle behind a metal detector is really very simple. Proof of this is the circuit that follows, in which it proves that the construction of a metal detector can be done in the minute, with few components that we find very easily everywhere. With the....
The sub-harmonic bass generator is a sound producing unit for guitars. The sound it produces looks very much like that of the bass guitar. The octave generator is sometimes quite unusual since it does not produce any of the usual ways of coloring the sound,....
In the past the sounding (sea bottom measurement) was done with the "bullet", that is, with a heavy lead object that the seamen plucked into the sea hung from a calibrated rope. As soon as the "bullet" reached the bottom, the depth appeared directly from the....
This Amplifier was designed to have the following specifications: Distortion less than 0.1% at full power of 100W even at 20KHz. Power has to be attributed to an extended bandwidth. The output transistors must be protected against short circuits. The power....
A series of LEDs serve to alert the gardener when plants need water. Using two conventional digital integrated LEDs and a series of LEDs, we make a very useful device for gardening. The device detects the amount of water in the pot and alerts the grower.....
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