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Very simple amplifier circuit using transistor 2N3904

Hi, Friends.
Today I get email from Kunal Banerjee, send a preamplifier projects to published for all to see.
It is Very simple amplifier circuit using transistor 2N3904 only. Though very small, but it still has many useful.

He says it low noise than normal IC circuits. and extremely low distortion. Frequency response: 20 Hz to 20 kHz.
It is a high gain but low power output and inverts signal output.

In circuit diagram or schematic which is set circuit in common emitter.

Schematic of very Simple preamplifiers using 2N3904
Schematic of very Simple preamplifiers using 2N3904

In electronics, a common emitter amplifier is used as a voltage amplifier.
In this circuit the base terminal of the transistor serves as the input, the collector is the output, and the emitter is common.

We can use this circuit for increase lower signal to higher before send to a normal amplifier which low gain but high power.


How to builds
Also He send me the PCB SILK as components layout see below.
PCB SILK

And the PCB layout.
PCB LAYOUT

and parts list.
//Capacitor///////////////////////
————————————
1uf 25v Electrolytic X 1
0.1uf 25v ce
rmic or mylar X 1

//Resistor///////////////////////
————————————
10K 0.25w X 2
100K 0.25w X 1

//Transistor///////////////////////
————————————
2N3904 NPN transistor X 1

Keep reading: ‘5 Simple audio amplifier circuit’ »

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This Post Has 4 Comments

  1. hi,
    how many DC volts are required to operate this circuit.

  2. hi,
    how many power supply volts are required to operate this circuit?

  3. The power supply can be 3 to 12~15V DC 1A max, also it works good with less the 0.5=500mA

  4. can use it for nrf 24L01 rf module
    can i fix both transmitter or receiver or transmitter

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