Very simple amplifier circuit using transistor 2N3904

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

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.

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

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

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 to increase the lower signal to higher before send to a normal amplifier which low gain but high power.

How to build it

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


And the PCB layout.
PCB LAYOUT

Parts lists

Capacitor
C1: 1uF 25V Electrolytic
C2: 0.1uF 50V Ceramic or Mylar

Resistor
R1: 10K
R2: 100K

Q1: 2N3904, NPN transistor

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awais

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

Brenda Keiffer

I got a schematic similar at 9 volts

awais

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

Tsvetoslav

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

Gulshan

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

Levent

Why do you need R1 it is not necessary

Brenda Keiffer

Anyone have info on using a 2N3904 as a rf amplifier for TV antenna

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