BC547 Double Transistor Audio Amplifier

by Utsource123

20K2322

Intro: BC547 Double Transistor Audio Amplifier

Hii friend,

Today I am going to make an amplifier using Double transistor of BC547.

Let's get started,

STEP 1: Take All Parts As Shown Below

Components required -

(1.) Transistor - BC547 x2

(2.) Resistor - 10K x1

(3.) Aux cable x1

(4.) Power supply - 5V DC

(5.) Capacitor - 63V 1uf/2.2uf x1

(6.) Speaker x1

STEP 2: Connect Both Transistors

Firstly we have to connect both transistors.

Solder emmiter pin of transistor-1 to base pin of transistor-2 as solder in the picture.

STEP 3: Connect 10K Resistor

Next we have to connect 10K resistor to the circuit.

Solder 10K resistor between collector and base pin of transistor-1 as you can see in the picture.

STEP 4: Connect Capacitor

Next solder +ve pin of 2.2uf capacitor to base pin of the transistor-1 as you can see in the picture.

STEP 5: Connect Speaker Wire

Connect speaker wire to the circuit.

Solder +ve wire of speaker to collector pin of transistor-1 and

solder -ve wire of speaker to collector pin of transistor-2 as you can see in the picture.

STEP 6: Connect Aux Cable

Next solder +ve (Left/Right) wire of aux cable to -ve pin of capacitor and

solder -ve wire of aux cable to emmiter pin of transistor-2 as solder in the picture.

STEP 7: Connect Power Supply Wire

Next connect 5V DC Power supply wire to the circuit.

NOTE : We can give input power supply with 5V charger,5V battery,.....5VDC.

Connect +ve clip of power supply to collector pin of transistor-1 and

-ve clip to emmiter pin of transistor-2 as you can see in the picture.

STEP 8: Aplifier Is Ready

Now Plug-in aux cable to mobile phone/laptop/tab.....and play songs.

Thank you

13 Comments

Night-tech 1 year ago

Tried it,but how can I make it loud ,and how can I use 3 transistors

harshalsardesai2 3 years ago

Why is the capacitor necessary ?? Could we work without it ??

shayamsundarrajbanshi1 2 years ago

You can work without it.But it is for filtering the audio signal and block any dc voltage

lukatopgun 2 years ago

So if I use a higher rated capacitor will the sound be clearer?

Agus4143 2 years ago

Nope it will sound the same

Agus4143 2 years ago

The capacitor is blocking dc you can use a disc non-polarized capacitor but it will sound a little bit off (i tried it with both)

AkinleyeO 2 years ago

Can I use it as phono preamp, what component should I add

lukatopgun 2 years ago

Can you show how to make it a stereo amplifier. And what if I wanted to use 3 transistors

M3D1C W4RR10R 2 years ago

The negative side of the audio signal is also connected on the ground. Schematic...

neatmachine 3 years ago

What type of speaker (how many ohms) will this circuit drive?