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Class AB Transistor Power Amplifier Circuit Diagram

2015-01-02 16:37  
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Class AB Transistor Power Amplifier Circuit


Discrete Class AB Transistor Audio Power Amplifier Circuit Diagram

This is a class AB transistor power amplifier. It is a simple amplifier to build, uses standard parts and is stable and reliable.??The entire circuit utilizes commonly available components and may be simply built over a general-purpose board. But this amplifier has very good sound quality.

 

Class AB Transistor  Power Amplifier Circuit schematic

There are eleven transistors, including four in the output stage. Q1 and Q2 transistor must be between 3 and 5??amperes power transistors. Q4 and Q5 must be between 100mA and 500mA driver transistors. Other transistors are 10mA small driver transistors.Q1,Q4andQ2,Q5arecomplementarypairs,theymakecomplementarydarlington pairs.

PART LIST
R11.5KΩ ?W
R2150Ω ?W
R31KΩ ?W
R40.22Ω 2W
R50.22Ω 2W
R639KΩ ?W
R71KΩ ?W
R8120Ω ?W
R96.8KΩ ?W
R106.8KΩ ?W
R1147KΩ ?W
R1247KΩ ?W
R132.2KΩ ?W
R14180KΩ ?W
R1518KΩ ?W
C122pF Ceramic
C24.7μF 16V
C3?1000μF 25V
C4100μF 25V
D11N4148
D21N4148
?Q1?2SD313
?Q2?2SB507
?Q3?2SA733
?Q4?2SB560
?Q5?2SD400
?Q6, Q7, Q8, Q9, Q10?2SA733
?Q11?2SD400
?LS1?4Ω 20W SPEAKER

Power output of the amplifier

Supply voltage (Vs)= 20V
?Speaker impedance (R)= 4Ω
?Peak to peak voltage (Vpp)= 20-2 =18V
?Peak voltage= 9V
?Maximum output (Pmax)= 9V2/2R
= 81/8
= 10W

10W is much enough for the day today home usage.

Amplification of this amplifier (A)

A= R6/R13 1
= 39KΩ/2.2KΩ 1
= 18

Volume control can be added to the circuit by connecting a 10KΩ??POT in series to the input of the amplifier.

Q1 and Q2 must be kept sufficiently cool, so it is mounted on a suitable heat sink. If you used single heat sink please use insulation between transistors and heat sink.

Class AB Transistor Audio Power Amplifier CircuitDiscrete Class AB Transistor Audio Power Amplifier


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