2B-TOGGLING TOUCH SWITCH
To switch OFF or ON a circuit different types of switches are used but a touch switch is the most convenient one. The touch switch operates if it is touched for a moment at this the speciality with it.
TECHNICAL DESCRIPTION AND WORKING
This project has been developed and successfully tested at TV Engineers Technical Lab.
In the circuit IC CD4017 has been used as a stable and its input pin No14 has been connected with a touch . When the touch plate is touched,the IC receives pulse its pin No 2. Develops high volt age. This high voltage brings the transistor BC 148 into conduction whin the conducts the relay operates. When we touch the touch plates again,pin No 15 develops high,but it is connected with pin No 4. As such the IC DC resets and the connected equipment/godget becomes OFF.
PRECAUTIONS WHILE ASSEMBLING
1.Keep the size of the touch plate small
2.Use shield wire to connect the touch plate with circuit.
LIST OF COMPONENTS
Type from T. OK ED Vol II page 30