1. 1 Electronic Circuits COMMON EMITTER CIRCUITS

2. 2 Electronic Circuits AMPLIFIERS CAN BE CLASSIFIED AS EITHER: VOLTAGE AMPS POWER AMPS AMPLIFIERS CAN BE CLASSIFIED AS EITHER: VOLTAGE AMPS POWER AMPS

3. 3 Electronic Circuits Voltage amplifiers are used to increase the level of an input signal. The amp may accept an input voltage of a few millivolts p-p and amplify the voltage to several volts p-p, then apply that voltage to another circuit or device. Voltage amplifiers are used to increase the level of an input signal. The amp may accept an input voltage of a few millivolts p-p and amplify the voltage to several volts p-p, then apply that voltage to another circuit or device.

4. 4 Electronic Circuits Power amps are used to increase the power level of an input signal. The power amp delivers a lot of power to a load by accepting a relatively low input current and producing a high output current. A low resistance load is necessary to develop a high output current. Power amps are used to increase the power level of an input signal. The power amp delivers a lot of power to a load by accepting a relatively low input current and producing a high output current. A low resistance load is necessary to develop a high output current.

5. 5 Electronic Circuits When using transistors as the principle controlling element in an amp circuit, three circuit configurations are possible.

6. 6 Electronic Circuits There are three common amplifier circuit configurations that were addressed in semi- conductors. WHAT ARE THE 3 TRANSISTOR CIRCUITS? There are three common amplifier circuit configurations that were addressed in semi- conductors. WHAT ARE THE 3 TRANSISTOR CIRCUITS?

7. 7 Electronic Circuits THE THREE AMPLIFIER CIRCUIT CONFIGURATIONS ARE: 1)COMMON-EMITTER 2)COMMON-BASE 3)COMMON-COLLECTOR THE THREE AMPLIFIER CIRCUIT CONFIGURATIONS ARE: 1)COMMON-EMITTER 2)COMMON-BASE 3)COMMON-COLLECTOR

8. 8 Electronic Circuits The three circuit configurations are formed by using the emitter, base or collector lead as the common lead. THE COMMON LEAD IS CONNECTED TO CIRCUIT COMMON OR GROUND. The three circuit configurations are formed by using the emitter, base or collector lead as the common lead. THE COMMON LEAD IS CONNECTED TO CIRCUIT COMMON OR GROUND.

9. 9 Electronic Circuits

10. 10 Electronic Circuits THE COMMON EMITTER CIRCUIT IS THE MOST COMMONLY USE CIRCUIT CONFIGURATION. This configuration is often used to increase the level of an input voltage. The voltage gain is expressed as a ratio: THE COMMON EMITTER CIRCUIT IS THE MOST COMMONLY USE CIRCUIT CONFIGURATION. This configuration is often used to increase the level of an input voltage. The voltage gain is expressed as a ratio:

11. 11 Electronic Circuits Both voltage and power amps can also be classified by frequency: DC AMPLIFIER - 10HZ OR LESS AUDIO AMP VIDEO AMP RF AMP IF AMP - INTERMEDIATE FREQUENCY Both voltage and power amps can also be classified by frequency: DC AMPLIFIER - 10HZ OR LESS AUDIO AMP VIDEO AMP RF AMP IF AMP - INTERMEDIATE FREQUENCY

12. 12 Electronic Circuits In some cases, one amplifier stage must be joined or coupled with another amplifier circuit to provide a higher overall gain. When we connect multiple amplifier circuits together we refer to it as amplifier coupling. In some cases, one amplifier stage must be joined or coupled with another amplifier circuit to provide a higher overall gain. When we connect multiple amplifier circuits together we refer to it as amplifier coupling.

13. 13 Electronic Circuits THEY ARE FOUR BASIC COUPLING METHODS USED: 1.RC COUPLING- RESISTANCE CAPACITANCE. 2.IMPEDANCE COUPLING- USES AN INDUCTOR. 3.DIRECT COUPLING. 4.TRANSFORMER COUPLING. THEY ARE FOUR BASIC COUPLING METHODS USED: 1.RC COUPLING- RESISTANCE CAPACITANCE. 2.IMPEDANCE COUPLING- USES AN INDUCTOR. 3.DIRECT COUPLING. 4.TRANSFORMER COUPLING.

14. 14 Electronic Circuits RC COUPLED AMPLIFIERS

15. 15 Electronic Circuits IMPEDANCE COUPLED AMPLIFIER

16. 16 Electronic Circuits DIRECT COUPLE AMPLIFIER

17. 17 Electronic Circuits TRANSFORMER COUPLED AMPLIFIER