Here are three Simple Class B Power Amplifier using ICs and transistors. The main idea they use low voltage supply and Cheap parts. We think them will useful for you.
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Class B Audio Power Amplifier, 15W using NE5532 and transistors
When feed power supply reach the circuit and feed input signal come in. The sound signal change C1 and R1 for signal coupling and eradicate noise oscillator go out. From that time go to reach input pin 3 non inverting of IC1. Which be op-amp IC boost up signal give the power goes up in order to go to drive give Q1 and Q2 work. Which IC1 will have expansion rate at 15 times can calculate from (R3/R2)+1.
From that time signal that enlarge already go out pin 1 of IC1 go to feed give with Q1 and Q2 which build the circuit model put-pull do signal both of section expansion positive and the section negative. By Q2 enlarge signal section way positive and build output give with Q3 which Q2 and Q3 this each other darlington for have the expansion ratio more and more.
Part Q1 signal boost up section way negative and build output signal give Q4. Which Q1 and Q4 build the circuit model Darlington also output signal of Q4 and Q3 and go out pin way E come to total up signal section positive and the section negative already go out still a loudspeaker. Because of while the circuit will work to is born the heat Q3 and Q4 thus then must add let off the heat gives with Q3 and Q4 with.
25W OCL Power Amplifier circuit using STK032
A younger brother of me receives Electronics KIT that older. It is Power Amp OCL 25w With IC STK032. But have no the circuit. I has looked into already be model to follow the circuit. When see already a button fines to decorate Volume, Bass and Treble of the sound has completely. And still the circuit integrated amplifier model OCL Class AB as well although will have 25Watt drives. But have a voice good loud moderately completed convenient for a novice , build good easy please sir.
35W OCL Power Amplifier Circuit using NE540+2N3055, MJ2955
Power Supply Voltage +25V/-25V 2A.
Output 8 OHM Speaker.
Today have Older power Amplifier OCL Circuit come to give friends get see in rows the way again. By it has the electric power about 35W at 8ohm loudspeakers and use Voltage Supply +25V and -25V at Current 2A. Which cheap systematize the sound is Class AB. By this circuit use the integrated circuit number NE540 replace the transistor has many. Then use power Transistor 2N3055 and MJ2955 at output. The detail is other invite a friend has seen in the circuit , be lucky sir.
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