2B-HAPPY BIRTHDAY WITH PUFF SOUND
This project is an interesting one . Instead of Candles, on Happy Birthday cake you can use this project. A puff of air from your mouth can put the glow of the bulbs OFF. So the bulbs can replace the candles. The other special characteristic of this project is its usuability. The entire family members can use it one by one. The number of bulbs or LED used can represent the age of your child. If the child is five yrs. of age, you can use six bulbs. As soon as you blow a puff, five bulbs will extinguish and 6th bulb will wish you a Happy Birthday through its light.
TECHNICAL DESCRIPTION AND WORKING
This project has been developed and tested O.K. in our TV Engineers Technical Lab. The components and PCB used in the projects published in our books are available for sale at resonable price.
This Project is a new Dhamaka in the field of Electronics. Earlier the People were lighting candles on the occasion of Happy Birthday. But in the present age of fashion, this electronics project makes it possible to celebrate in a fantastic way and one can surprise friends. The working of this project is based on Timer IC 555. In this project, the puff sound is given to the condenser mike. In normal condition IC remains in reset position, but activated through the sound of a puff and information at its Pin no. 2 becomes low and by this the IC is triggered and its inverter amplifier Pin no. 3 produces high state information which conducts the transistor BC148 and relay becomes ON. The second transistor is used as a feedback for pin no 2 of IC 555, which latch the IC after the function & puts OFF the bulb or L.E.Ds used in place of candle.
PRECAUTIONS WHILE ASSEMBLING THE PROJECT:-
*First of all check all the components as per circuit.
*Clean PCB after SOLDERING, so that the component or print do not short.
*while mounting transistor, be sure that you have connected collector, base & emitter properly.
*Pay proper attention to the polerity of capacitor and diodes while assembling.
*Please use resistance of the exact value as given in the circuit.
*For better result you have to operate this project first of all at 9V DC supply.
*Check polarity of condenser mike while mounting.
IC 555 = 1
BC148 = 3
RELAY 9V = 1
1MFD/25V = 1
.22MFD = 1
15K = 1
10K = 2
4.7K = 2
1M = 1
2.2K = 1
220K = 1
100K = 1
100K = 1
CONDENSOR MIKE = 1