Single Stage Amplifier
AIM
To study the characteristics of single stage amplifier using NPN transistor and find the gain.
COMPONENTS AND EQUIPMENTS REQUIRED
- TRANSISTOR BC107 1NO
- REGULATED DC SUPPLY 0-30V 1 NO
- FUNCTION GENERATOR 30KHz 1NO
- RESISTOR 47K, 2.2K, 10K, 680 ohm & 1K 1NO Each
- CAPACITOR 10mf 3NO
- BREAD BOARD 1NO
- CONNECTING WIRES AS REQUIRED
THEORY
RC coupled CE amplifier is widely used in audio frequency application in Radio and TV receivers. It provides current, voltage and power gains. Base current controls the collector current of the common emitter amplifier. A small decrease in base current causes large decrease in collector current. The emitter-base junction should be forward biased and collector-base junction should be reverse biased for proper functioning of amplifier. In the circuit diagram an NPN transistor is connected as CE amplifier. Voltage divider bias provides good stabilization independent of the variation of 𝛽. The input signal Vin is coupled through CC1 to base and output voltage from collector through the CC2.
The input impedance of amplifier is Zin and output impedance is Zout.
The gain of amplifier is Av = output voltage / input voltage
PROCEDURE
- 1. Set up the circuits on bread board
- 2. Give 12 Vdc to the circuit using power supply.
- 3. Give Vin by using function generator.
- 4. Observe the input and output voltages for different frequencies.
- 5. Calculate the gain.
- 6. Plot the graph frequency VS gain.
CIRCUIT DIAGRAM
Band width = FH – FL
OBSERVATION
| SI No | Frequency (Hz) | Output voltage(Vo) in volts | Gain= 20 log Vo/Vin |
RESULT
Studied the characteristics of single stage amplifier using NPN transistor and found the band width and gain.
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