Page 150 - CITS - Electrician - Trade Practical

ELECTRICIAN - CITS

TASK 2 : Operate the single stage amplifier.

1 Connect the power supply and switch ON the circuit.
2 Connect the function generator to input terminals
3 Observe the input wave forms.
4 Calculate the frequency and input voltage from CRO and note down it.
5 Connect the output terminals to the CRO.

6 Observe the output wave form. Adjust the frequency of input signal so that a sine wave is obtained at output.
7 Measure the output voltage. It should be a high value because of amplification due to transistor action.
8 Calculate the frequency of wave form. [f =1/T]
9 Switch off the supply.

TASK 3 : Calculate the gain of the single stage transistor amplifier

1 Calculate the gain of the amplifier as per the formula given below.
Gain = Output voltage / Input voltage
Gain in dB = 20 log V output / V input
2 Tabulate results in Table 1.
Table 1

Frequency Input voltage Output voltage Gain Gain in dB

133

CITS : Power - Electrician & Wireman - Exercise 63