500 WATTS AUDIO POWER AMPLIFIER CIRCUIT DIAGRAM.

xyznet24 August 29, 2023

POWER AMPLIFIER 


This circuit is a high-power audio amplifier, with multiple stages of amplification and protection components. The careful selection of transistors, resistors, capacitors, and other components ensures efficient and stable operation at high power levels.

Power amplifiers are essential components of audio systems since they amplify the low-level signals to high levels to drive speakers. A 500W power amplifier circuit is an ideal design for these applications. This kind of amplifier makes it possible for the system to produce sound that is loud enough to be heard in large spaces. 

The amplifier circuit uses five pairs of 2SC5200 and 2SA1943 power transistors. Each pair of transistors is connected in a push-pull configuration. The push-pull configuration provides a higher power output than the common emitter configuration that is generally used in small scale amplifiers.

Transistors:
  1. 2SA1943 (Q1, Q3, Q5, Q7, Q9): PNP power transistors used in the output stage.
  1. 2SC5200 (Q2, Q4, Q6, Q8, Q10): NPN power transistors used in the output stage.
  1. TIP42 (Q13): PNP power transistor, likely used as a driver.
  1. C2229 (Q14, Q15): NPN transistors, possibly used for voltage amplification or phase splitting.
  1. A1015 (Q16, Q17): PNP transistors used for initial signal amplification.
  1. 2SC1815 (Q18): NPN transistor used in the signal processing stage.
  1. B688 (Q11): PNP transistor used in the output stage alongside the NPN transistors.
Diodes:
  1. 1N4007 (D1, D2, D3): General-purpose rectifier diodes for protection and power regulation.
  1. 12V Zener Diode (D4): Used for voltage regulation.
Resistors:
  1. 0.22Ω (R1, R2, R5, R6, R9, R10, R13, R14, R17, R18): Used as emitter resistors in the output stage to ensure stability.
  1. 2.2Ω (R3, R4, R7, R8, R11, R12, R15, R16, R19, R20): Also used in the emitter circuit for the transistors.
  1. 10Ω (R21, R22): Likely used in feedback or damping circuits.
  1. 100Ω (R23, R24): Used in biasing or as part of the signal path.
  1. 150Ω (R25, R26, R29): Used in the signal path or biasing.
  1. 1KΩ (R31): Used for biasing or signal processing.
  1. 3.3KΩ (R32, R33): Biasing resistors.
  1. 4.7KΩ (R36, R37): Used for signal processing or biasing.
  1. 33KΩ (R27, R35): Used for feedback or biasing.
  1. 56KΩ (R34): Used in the input stage or feedback loop.
  1. 50KΩ (R30): Likely used as a potentiometer for biasing adjustment.
Capacitors:
  1. 100nF (C1, C4): Used for decoupling and filtering.
  1. 100pF (C5): Likely used for frequency compensation.
  1. 0.47µF (C7): Used in the input coupling or decoupling.
  1. 47µF (C6, C8): Used for power supply smoothing or signal coupling.
Inductor:
  1. 5µH (L1): Used to filter high-frequency components from the output signal.
Other Components:
  1. Speaker (LS1): The load connected to the output, specified as 500W, indicating the power rating of the amplifier.
  1. Power Supply Rails:
  • +(45-75V) and -(45-75V): The power supply voltages for the circuit.


DOWNLOAD FULL AND VISIBELE CIRCUIT  (PDF FILE)



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