This article is about Single Transistor Amplifier Circuits.  An audio amplifier is a device that multiplies an applied input signal amplitude to a level that may be much higher than the input signal. The input is given in the form of audio or music. The amplifiers are classified into classes like class A, class B, class AB, class C, and class D. Here we are going to discuss the first type of amplifier i.e. class A amplifier, and also learn how to build a single transistor amplifier circuit class A.

Single Transistor Amplifier Circuit

Amplifiers are generally very efficient because these amplifiers conduct only during the presence of an input signal and they only boost input signals. Single transistor amplifiers are very low-power testosterone cypionate for sale amplifiers and consume very low energy even a single battery of low amperes can be used to run it for many hours.

We want to make clear these types of amplifiers are very easy to build but the quality of the mini amplifier circuit is not very good.

Single transistor amplifiers also known as The common emitter amplifier is widely used due to the very easy circuit to design. A simple single-transistor amplifier dramatically boosts audio input to output.

Components required For Single Transistor Amplifier Circuit

  • Transistor 1  any NPN type
  • A resistor 4.7k
  • Speaker 3w 4 ohm
  • capacitor 10uf 16v

Single Transistor Amplifier Circuit circuit diagram

Single Transistor Amplifier Circuit


Vout = R2 * R1 + R2 * Vin

Re-arrange formula

R1 = R2(Vin * Vout − 1)

Here the speaker is R2, which is 8Ω, Volts in (VIN) is 5V and Vout is 2.83V. So alternate the values and we have:

R1 = 8(52.83 − 1)

12 volts Amplifier Circuit using a single transistor

The given below circuit diagram is perfect for 12 volts. The quality and output of this circuit is much better than the circuit given above for 4 volts. In this way, you can change testosterone undecanoate 250 speakers as well as resistors according to the formula.

Single Transistor Amplifier Circuit

12 volts Amplifier circuit diagram

Given below circuit diagram is 12 volts single transistor amplifier circuit.

Single Transistor Amplifier Circuit

9 volts amplifier Circuit Diagram

The given below circuit diagram is the calculated form of a single transistor amplifier for 9 volts battery. It is also low power and low-consuming energy amplifier.

Single Transistor Amplifier Circuit

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