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8 Watt Audio Amplifier Schematic: Build Your Powerful Project

Description

The following schematic illustrates a design for a 8-watt audio power amplifier. This device is suitable for a straightforward amplification task, forming the core element of a more complex amplifier system, or utilized as a guitar amplifier. It represents a compact and mobile unit, capable of operation through a 12V battery supply. The circuit was developed on a Vero Board, necessitating supplementary inductors, capacitors, and resistors to mitigate any potential oscillations.

Circuit diagram:

Circuit diagram

Parts:

  • R1 = 47K
  • R2 = 2.2R/1W
  • R3 = 220R/1W
  • R4 = 2.2R/1W
  • C1 = 100nF-63V
  • C2 = 10uF-25V
  • C3 = 470uF-25V
  • C4 = 2000uF-25V
  • C5 = 100nF-63V
  • IC1 = LM383
  • SPKR = 4ohm/8W

Notes:

  1. IC1 has to be mounted on a heat sink for proper functionality.
  2. C1 serves for filtering purposes and preventing oscillations; its omission is discouraged.
  3. The circuit can be constructed on a Vero Board, a universal solder board, or a printed circuit board; a printed circuit board is generally preferred.
  4. The circuit consumes approximately 880mA at a 12V supply.
  5. By changing the values of R2 and R3, it is possible to transform this amplifier into a guitar amplifier without the need for a preamplifier.
  6. If a 2200uF capacitor is unavailable, a suitable replacement with a 2000uF unit can be used.
  7. The inclusion of a 0.2uF capacitor in series with a 1 ohm resistor at the output can effectively mitigate oscillation under specific conditions.
circuit from http://www.extremecircuits.net/2009/12/8-watt-audio-power-amplifier-schematic.html