A very interesting project of a light activated alarm or morning alarm circuit. The circuit will produce a beautiful melody when it will detect light. You can use this circuit as a morning alarm, for this purpose first select a permanent place in your home which gets morning light and then adjust the 500K variable resistor to produce melody on the
Click here to download the full size of the above Circuit.
desired amount of light, after adjusting the desired light level, this circuit will produce melody on the same amount of light every day. You can also use this circuit as light activated alarm for other sources of lights, for this purpose also you have to adjust the 500K variable resistor to produce the melody on the desired amount of light. The melody circuit is built around the UM66 IC, which is a CMOS IC comes in TO-92 transistor package. Working of the circuit is simple the transistor BC 547 is working as a switch when the LDR detects light its resistance will decrease which will switch on the BC547 transistor and as a result 3 volts start passing through the transistor which will power on the UM66 melody circuit. The transistor 2N3904 is used to amplify the sound of the melody to drive an 8 Ohms speaker.
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.....
characters left: