THE SPECIALITIES OF PROJECT
This circuit acts as a intelligent switch because it works very intelligently. Suppose you are viewing the TV and without putting it OFF you leave the place and go to your friend. Mean time electric supply goes OFF and then it is restored. When the supply is restored there is nobody in the room to see the TV. This intelligent switch provides the solution to the problem.
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.
The circuit is made of two transistors and no transformer is used. The working system of circuit is simple and it is fit for upto 100w load. STR is used in the circuit. There are two specialties of the project:-
- When supply goes OFF for few moments, the equipment will remain in ON position.
- In case the power supply is restored after 15-20secs then equipment will be Put OFF.
When 220V AcC is connected to circuit, it gets rectified through diode D1 after the resistance R1. It is filtered with the condenser C1. The switch is S1 & S2 works as ON and OFF switch. When S1 is pressed the transistor T1 & T2 starts conducting. Both LED1 & LED2 starts glowing. This indicates that circuit is in ON position. If we want to put OFF the equipment the switch S2 is slightly pressed. This circuit can be used for different type of light. The circuit can be fix inside the switch board.
PRECAUTIONS WHILE MAKING THE PROJECT
- While connecting diode take care about cathode and anode of the diode.
- While connecting electrolytic condenser take care of its polarity.
- While connecting transistor take care of its collector, base & emitter.
While assembling the project check components with meter.