GOVERNMENT ENGINEERING

COLLEGE BHAVNAGAR

Branch:-computerName:-Bhavika M. chavdaEn.no.:-140210107008Subject:- Electrical workshop

AIM :-

To set up a circuit for tempereture

meter.

COMPONENTS USED :-Equipments Specification

sQuantity

Resistor22 kΩ ( 1/8 watt)

10 kΩ ( 1/8 watt)

2

1

Temperature sensor

10 kΩ (NTC) 1

Galvanometer 1 mA (FSD) 1

Battery 3 V 1

Transistor 1BC-547 1

Flexible wires For connection purpose

½ meter approximately

PCB For connection purpose

1

CIRCUIT DIAGRAM :-

CIRCUIT DESCRIPTION :- Here, bridge circuit assembled as per

circuit diagram. Connect the transistor and meter as

shown into the figure. And the power supply given to the

circuit is 3-V DC.

CIRCUIT WORK :- As the temperature at the sensor

increases the resistance of the sensor decreases (NTC).

Hence, the current flow through the sensor increases and the amplifier transistor will get the forward bias.

So, the transistor will flow β times more current from collector that will lead the galvanometer to deflect.

OUTPUT :-

“As the temperature increases or decreases the deflect of the meter increases or decreases respectively ….”

TOTAL COST :-

Approximately 200 /-

Thank you..