In this video i am showing, how to make a 13003 transistor amplifier homemade using a single 13003 transistor from an old damaged scrap CFL bulb. I demonstrated it with 3.7 volts 18650 lithium cell. You can increase the voltage to get more power. I used here two 5 inch 4 ohms speakers which is providing enough sound for my room.
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Following is the schematic of single 13003 NPN transistor amplifier. This transistor can easily be found from any scrap 25 watts CFL bulb. All the CFL bulbs are having two of them. This circuit is designed with very few and minimum components. And its very easy to build for beginners and students newly entered in electronics field. It doesn’t require any professional experience to build it and any one can make it at home very easily.
of 13003 CFL transistor amplifier
Following is a damaged CFL of 25 watts which has pair of 13003 transistor in good condition. We will take out one of them from the board and will use in out amplifier. Open the bulb compartment with sharp edged flat screw driver or cut around with hacksaw blade. Remove the cap and cut all wire coming from main supply and the tube and separate the components board. You will se two 13003 transistors, one each side. Gently remove one 13003 transistor from either from a soldering iron and use it.
We will also use a lithium cell of 3.7 volts 2200 mAh as our power source to run the amplifier. Below image shows a cell fully charged and ready to run this amplifier.
Take one 13003 transistor and solder a 470 ohms resister to its left & center pins. Left pin is base, Center pin is collector and right pin is emitter.
Now take one 47uf capacitor and solder its positive side leg to the base of transistor, the most left pin-1.
Now solder the negative wire of the lithium cell to the right most pin-3 (emitter) of the transistor. Also take a 3.5mm mobile audio jack and solder its left & right channel output wires together with the same right most pin-3 of transistor.
Connect the 47uf capacitor’s negative leg with the ground wire of 3.5mm audio jack’s ground wire. Also take a 4 ohms speaker and connect its one wire to the center pin collector of the transistor.
Finishing & testing:
Connect the second wire of speaker with the positive wire of lithium cell. You can use a 12 volts on/off switch in between these two wires in series for disconnecting the battery from the amplifier. You can also can use power supply from 3.7 volts to 12 volts instead of lithium cell. Now insert the jack pin to your mobile. Play music and enjoy it.
List of components
used in 13003 CFL transistor amplifier
- 13003 transistor x 1
- 47uf capacitor x 1
- 470 ohms resister x 1
- 3.5mm audio jack
- 3.7v lithium cell
- Speaker 4 ohms
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