Convert Old Cfl to Audio Amplifier

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Hii friend,

Today I am going to make an audio amplifier using old cfl.We will use transistor from cfl.

Let's get started,

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Step 1: Take All Materials As Shown Below

Materials required -

(1.) Transistor - 4205 x1

(2.) aux cable x1

(3.) Speaker - 8 ohm x1

(4.) Battery - 9V x1

(5.) Battery clipper x1

(6.) Capacitor - 25V 100uf x1

(7.) Resistor - 1K x1

Step 2: Connect Resistor

Firstly we have to connect 1K resistor to the transistor as shown.

Connect 1K resistor to pin-1 and pin-2 of the transistor as you can see in the picture.

Step 3: Connect Capacitor

Next we have to connect capacitor.

Solder +ve pin of capacitor to pin-1 of transistor as shown in the picture.

Step 4: Connect Aux Cable

Next connect aux cable wire.

Connect +ve wire of aux cable to -ve pin of capacitor and

-ve wire to pin-3 of transistor as shown in the picture.

Step 5: Connect Battery Clipper Wire

Connect +ve wire of battery clipper to pin-2 of transistor.

Step 6: Now We Have to Connect Speaker

Now we have to connect speaker wire.

Connect -ve wire of speaker to -ve of battery clipper and

+ve wire of speaker to pin-3 of transistor as you can see in the picture.


Connect battery to battery clipper and plug in aux cable to mobile phone and play songs.

Thank you

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