2B-MUSICAL LIGHT CHASER
THE SPECIALITIES OF PROJECT
This is a special type of chaser in which 60W bulb are used in place of LEDs. The bulbs are connected with electric circuit which is put them ON/OFF. This is controlled by the speaker. The speaker is not connected directly with the circuit but the light of bulbs depends upon the sound of the speaker. The chaser is used in the marriage party and similar functions.
TECHNICAL DESCRIPTION AND WORKING OF THE PROJECT
This project has been developed and tested by our readers and sent to the “T.V.Engineers Technical lab” for publication in the book. The spare parts and PCB of the projects published in the series of our book publication or available in the market. The information of project code is given in the first and last page of the books.
In the project 9V DC regulated power supply is used. The main supply is given to a step down transformer which gives 12V DC. It is rectified with Full wave Rectifier and DC produce is given to the voltage regulator IC LM7809. The LED1 give the indication that 9V DC is available.
When music system is kept near the condenser mike in the circuit. The electrical signal from the mike are amplified through the operational amplifier IC 741 and given to the input Pin of IC LB1473. The IC LB1473 is a 5 Dot Level meter Indicator. 5 Transistors are connected to the output of the IC. The output of the transistor goes to the triac and then to the bulbs. The audio signal of the musical system goes to the input of transistor T!-T5. The triac are fired according to the output of these transistors. These bulb connected to the triac starts glowing. When audio level goes high in all transistors then all transistor fire and bulb ZL1-ZL5 starts glowing. The speed of glowing of the bulbs can be adjusted with the help of preset VR2.
PRECAUTIONS WHILE MAKING THE PROJECT
When a circuit is tested on supply, the component of circuit should not be touched.