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# How to Build Single Transistor Amplifier Circuit An audio amplifier is a device that multiplies the applied input signal amplitude by a level that may be much higher than the input signal. It gives input in the form of audio or music. Amplifiers are classified into A, B, AB, C, and D grades. Here, we will discuss the first class amplifier, class a amplifier, and learn how to build class a single transistor amplifier circuit.

Amplifiers are usually very effective because they only work when there is an input signal, and they only raise the input signal. Single tube amplifiers are very low power amplifiers and consume very low energy, even that it can run for many hours by a low amp battery.
We want to show that these types of amplifiers are very easy to manufacture, but the quality of micro amplifier circuits is not very good.
Single transistor amplifier is also known as common emitter amplifier, which is widely used because of its simple circuit design. A simple single amplifier greatly improves the audio input and output.

### Required Components

• Transistor 1 any NPN type
• Resistance 4.7K
• Speaker 3W 4 ohm
• Capacitor 10uF 16V single transistor amplifier circuit single transistor amplifier circuit

CalculationVout=R2R1+R2VinRearrange formulaR1 = R2 (vehicle identification number * voucher – – 1)
The speaker here is R2, i.e. 8 Ω, the voltage input (VIN) is 5V, and the voltage output is 2.83v. So usi
ng these values alternately, we get:R1=8（52.83-1）12V amplifierThe circuit diagrams given below are for 12 volts. The quality and output of this circuit is much better than the 4-volt circuit given above. So you can change the speaker and resistor according to the formula.Circuit diagramThe circuit diagram given below is a 12 volt single tube amplifier circuit.
9 volt circuit diagram
The circuit diagram given below is the calculation form of single tube amplifier for 9 V battery. It is also a low power, low power amplifier. audio amplifier sigle transistor circuit 12v

### Required components

• Transistor 1 any NPN typeResistance 4.7KSpeaker 3W 4 ohmCapacitor 10uF 16V

### Calculation

Vout=R2R1+R2VinRearrange formulaR1 = R2 (vehicle identification number * voucher – – 1)The speaker here is R2, i.e. 8 Ω, the voltage input (VIN) is 5V, and the voltage output is 2.83v. So using these values alternately, we get:

R1=8（52.83-1）

## 9 volt circuit diagram

The circuit diagram given below is the calculation form of single tube amplifier for 9 V battery. It is also a low power, low power amplifier. 9 volt circuit diagram