Alarm Circuits
Posted on Feb 7, 2014
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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.... -
Many times for various reasons we forget or can not water the plants that we have in our homes. And many humidity sensors units just notify us with a beeping sound or with a flashing light, that the pot needs watering. But what if we are away from home? This.... -
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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This circuit uses a 556 to first generate a low frequency square wave, that is modulated to...
With the advent of modern radio and radar systems came the need to provide stable harmonic...
You can start to set your Square Wave Generator up using 555 timer IC through the circuit shown...
Amplify a MG811 CO2 sensor to a range readable by an ATMEGA2560 (0-5v). I have other analog...
Acquired an old Eistar SJ-1 Digital pulser. However the frequency it generates is always 66% of...
LA4440 is a dual channel audio amplifier IC. It can be used in two modes one is Stereo amplifier...
Here`s the Arduino code for reading incoming packets from the XBee and displaying the received...
The circuit was designed to create an electronic siren to provide a scheme for producing an alert...
The beat frequency oscillator (bfo) is necessary when you want to receive cw signals. Cw signals...
More and more equipment is sold that runs off internal rechargeable batteries. Although a...
220V AC by VD1-VD4 bridge rectifier, all the way to supply four lights Hl - H4 electricity,...
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