tempetature meter

2. Branch:-computer
Name:-Bhavika M. chavda
En.no.:-140210107008
Subject:- Electrical workshop

3. To set up a circuit for tempereture
meter.

4. Equipments Specifications Quantity
Resistor
22 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

6.  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.

7.  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.

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

9. Approximately 200 /-