50W Class B power amplifier circuit

Power amplifier Class-B is the most popular operating modes, and possibly more than 99% of the current series of power amplifier designed and manufactered are of this class. Defining the Class-B is the amount of bias voltage that causes conduction of both output devices to overlap with the current and thus produce the minimum amount possible crossover distrosi.

This Class-B power amplifier performance :
Power Output________________________50W
RL Impedance_______________________8R
Distortion__________________________Below 0.0006% at 1 kHz and 50W/8R
Slew rate___________________________Approximately 35V/us
Noise______________________________-91dBu at the output
EIN_______________________________-117dBu (referred to input)
Frequency response__________________+0, -0.5dB over 20Hz-20kHz

Part List :

Resistor
R1,R8____________________________10K
R2,R3,R13________________________100R
R4_______________________________150R
R5,R10___________________________1K
R6,R7____________________________68R
R9_______________________________500R
R11______________________________220R
R12,R24__________________________100R
R14______________________________18R
R16,R17__________________________0.1R 5W
R18______________________________10R 5W
PR1______________________________1K trim

Capacitor
C1_______________________________10uF
C2_______________________________220uF
C3_______________________________100pF
C4_______________________________4u7F
C5_______________________________1uF
C6_______________________________100nF 400V
C7_______________________________15pF
C7,C8____________________________100nF
C8,C10___________________________220uf

Diode
D1_______________________________1N4148

Transistor
Tr1,Tr3,TR5,TR14__________________MPSA56
Tr4,Tr10,Tr13______________________MPSA06
Tr6_______________________________MJE340
Tr7_______________________________MJ802
Tr8_______________________________MJE350
Tr9_______________________________MJ4502

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