Thursday, March 7, 2013

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50W Class-B power amplifier circuit 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.


high power amplifier class-B

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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