BD139 Transistor Amplifier Make Easily

Introduction: BD139 Transistor Amplifier Make Easily

About: Share diy projects to those who have the same hobby with me

Hii friend,

Today I am going to make a Transistor Amplifier using BD139 Transistor.This transistor amplifier is working properly.It's output sound depend upon the speaker and source.

Let's get started,

Step 1: Take All Components As Shown in the List/pictures

Components Required -

1.Battery - 9V

2.Battery connector wire

3.Speaker

4.Transistor - BD139

5.Resistor - 1K

6.Capacitor - 16V 100uf

7.AUX Cable

Step 2: Connect All Components As Shown in the Circuit Diagram

All components are compulsory for this amplifier.

Step 3: Connect Resistor

Connect 1K resistor to the Collector and Base of the transistor as shown in the picture.

Step 4: Connect Capacitor

Now Connect the +ve of 16V 100uf Capacitor to the base of the transistor as you can see in the picture.

Step 5: Connect AUX Cable

Solder +ve of aux cable to the -ve of capacitor.

and solder the -ve of aux cable to the emmiter of the transistor.

Step 6: Solder Speaker Wire

Now solder the +ve wire of speaker to the emmiter of the transistor.

Step 7: Connect Battery Wire

Next Solder the -ve wire of battery to the -ve wire of speaker.

and the +ve wire of Battery to the collector of the transistor.

Step 8: Connect Battery

Connect battery to the circuit.

Now our BD139 transistor amplifier is ready to play.

Connect aux cable to your phone/laptop/tab/......etc and play songs and enjoy

Step 9: Enjoy With Full Volume

Hii friend,

I made everyday new projects in this blog.If you like your blog then visit everyday to make new projects.

Thank you

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    9 Discussions

    0
    ErwinM5
    ErwinM5

    Question 12 months ago

    Fantasties project, and simple
    I would like to try the circuit to control a servo with my android phone via sound would this be possible
    Can you help me please

    0
    ELECTRONFLYER1
    ELECTRONFLYER1

    1 year ago

    YOUR CAPACITOR POLARITY IS CORRECT.

    0
    Utsource123
    Utsource123

    Reply 1 year ago

    yes

    0
    ELECTRONFLYER1
    ELECTRONFLYER1

    1 year ago

    ARE YOU USING A 8 OHM OR 50 SPEAKER?

    0
    Utsource123
    Utsource123

    Reply 1 year ago


    8 ohm speaker

    0
    baldengineer
    baldengineer

    1 year ago on Step 9

    This circuit IS NOT designed correctly. First, the base MUST have a series resistor for proper operation. Second, the audio signal is shown as entering the negative side of a coupling capacitor. This IS NOT correct.

    PLEASE, original poster, STOP POSTING POOR CIRCUIT DESIGNS.

    0
    Utsource123
    Utsource123

    Reply 1 year ago

    You are write but amplifier is working 100% in this circuit diagram.
    thanks for comment

    0
    ELECTRONFLYER1
    ELECTRONFLYER1

    Reply 1 year ago

    WRITE IS WRONG RIGHT IS CORRECT