If you want 15W x 2 OCL small amplifier circuit, high quality and save money. I recommend this circuit.
You can use it to amplify the normal sound in the home. At the level of pleasant sound power. It was the first amplifier circuit that I created. Also, we will often see this circuit in a generally affordable amplifier.
Reason
Because it has fewer components others circuits. It consists of transistors 2SC1172 and 2SA715, universal IC 741, a few parts. And, you can buy them easily.
If compare it at the same volume level is cheaper than other circuits.
Of course, everything has its disadvantages.
This circuit also has a disadvantage, it is an OCL amplifier. Someone who is interested in an audio system would know that if something goes wrong. It may easily cause the speaker to be broken.
This circuit is suitable for Experienced people, people who have already built other small amplifiers. However, if you are a beginner. We will build it meticulously and have a process. Yes, you can do it.
Main power amplifier working
Designers set this circuit in “Direct Coupling All Complementary IC Drive”. The heart of the circuit is IC1741. It is the differential amplifier pre-driver circuit.
The output signal of IC1 flows through two 1N4148 diodes D1 and D2 to the transistor drivers Q1BC547, Q2 BC557. Then, these current come to two main transistor output 2SC1162 and 2SA715
Part
IC1:LM741 op-amp
Q1: BC 547
Q2: BC 557
Q3: 2SC1162
Q4: 2SA715
D1, 2 : 1N4148
C1 : 47uF 25V Electrolytic capacitors
C2: 100nuF 50V
PCB 100 x 55mm
The Power supply
12V CT 12V, 3A secondary transformer / switching regulator
Check the completed PCB, Is it defective, short circuit?
Before assembling an electronic circuit, be careful with polarized devices. We only need to connect them correctly.
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