Photo alarm
Posted on Feb 7, 2013
New Circuits
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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 low cost, crystal-controlled oscillator uses one TTL gate. Two factors ensure oscillator...
The ac ringing voltage (typically 40 to 90 V at 26 Hz) is rectified by U1, the tone-ringer IC,...
This is the schematic diagram of LPG gas leakage sensor alarm. The circuit operates off a 9V PP3...
A simple way to produce your own speaker transformer by winding turns on a piece of ferrite rod....
It can detect what`s being typed on it. It can be used to send text to and/or receive text from a...
This page describes a project a colleague and I completed between September, 2000 and March, 2001...
%2BCircuit%2Bdiagram%2Busing%2BCD4047%2Band%2BIRFZ44%2Bpower%2BMOSFET.webp "Open page in a new tab")
This simple low power dc to ac inverter (dc to ac converter) circuit converts 12V DC to 230V or...
Here is a simple 3 band graphic equalizer circuit made of a single op amp IC LF351 (IC1) and few...
The circuit below illustrates using a 10x10 matrix to sequence up to 100 LEDs with just three ICs...
This is a project that I undertook during June 1996 as my final year electronics project. The...
The DPT Transmitter is a dual powered Voice Transmitter that came about from quite a few request...
The heart of the circuit is the two transistor flasher with frequency modulation applied to the...
20W + 20W of stereo amplifier consists of two complete, independent 20-watt RMS amplifier in...
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