About the circuit.
This is a low cost amplifier circuit using 4 transistors and one op amp. The op amp uA 741 produces the required gain and the transistors wired in complementary Darlington configuration produces the drive for the speaker.
The input for the Darlington pairs are derived from the power supply as a voltage drop across R2 and R3.The voltage drop across these resistors will be proportional to the input signal because the supply current to the op amp varies according to the input signal .The negative feedback from the junction of Q4 and Q2 stabilizes the amplifier. This circuit will produce a decent 12W out put power on a 4 Ohm speaker .
Circuit diagram and parts list.
Tips.
- Use a +12 , -12 , 1A dual power supply for powering the circuit.The power supply must be well regulated and filtered to reduce the noise.
- Wire the board on a good quality PCB or common board.
- Do not give more than +15 , -15 volts to the circuit.
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give some more information about this circuit
pls, i need construction of slave engine amplifier with circuit diagram
I cant find Q1 AC108 anywhere on the web too….where is its data sheet, neither it is present at Electronic WorkBench….plz sombody help me
very god circiut.i m working this circuit
please i would love to have the principle of operation of the circuit of the 12 watt amplifier circuit.
ii like the circuit
hello
how are you
i live in iran -tank you for this website.
please give me a circut shok,
see you byby
Hello
I am interested to build this amp.
Please send me copy of PCB layout
Thank you
Ronald
fish nana hip HIP
i need a 20 watt audio amplifier with a transistor output. pls tnx FISH..
hi am Ismail and am requsting you to send me a diagram of an ampwhich will work with my,pioneer impp 450watts speaker without hamming.thank you
12 Watt Transistor Amplifier Circuit…
This is a low cost amplifier circuit using 4 transistors and one op amp. The op amp uA 741 produces the required gain and the transistors wired in complementary Darlington configuration produces the drive for the speaker…….
12 Watt Transistor Amplifier Circuit…
This is a low cost amplifier circuit using 4 transistors and one op amp. The op amp uA 741 produces the required gain and the transistors wired in complementary Darlington configuration produces the drive for the speaker………
i cant determine the electrical meaning.
if R1 10k, how many watts of this?
what is the name of the each resistors?
please help me !
Don’t take the 300mA I mentioned too serious. It’s a good bias, but I just added a zero to the resistance value as a quick estimation, and ended up with that bias. So use whatever bias you please.
hi my name is uche from nigeia pl,s cant you send me jrc4558orne555. 2000W POWER AMP
hi,i really love doing elecronics, but i would be really excited if you can send me a mail about new curcuit drawings and explanation on hoe they work. im intrested in amplifires, resistors, transistors, dioeds etc.
thank you
This is a very good information for those working at home and making some make shift transistors since it’ll be more affordable than those in the markets!
Thank you for sharing this!
Kudos!
More power!