32 Watt Stereo Amplifier

August 20, 2010 - category: Audio - amplifiers


A 32 Watt per channel stereo power amplifier made using the TDA2050V monolithic integrated circuit.

32 Watt Stereo Amplifier


This circuit is for a 32 Watt stereo audio power amplifier using the TDA20501. With a dual 22 Volt supply this amplifier can deliver 32W into 8 ohm loudspeakers. Moreover, the TDA 2050 delivers typically 50W music power into 4 ohm load over 1 sec at VS= 22.5V and f = 1KHz. The amplifier is cased as a Pentawatt package see pinout below:

32 Watt Stereo Amplifier pinout

This is a power amplifier and requires 200mV RMS for full output. Voltage gain is 30.5dB with resistor values shown. Closed loop gain is set by Ratio R1/R2. Increase R2 for less gain and vice versa. Power bandwidth is 20Hz to 80KHz. R3, C3 and R6, C11 form a zobel network to prevent high frequency instability.

The speaker is direct coupled, therefore no expensive large value electrolytics are needed and the bass will be crisp and clean. It is advisable to place fuses in the power supply (not shown).

Parts List

  • R1,R4,R5,R8______22k 1/4W Resistor
  • R2,R7__________680R 1/4W Resistor
  • R3,R6___________2.2R 1/4W Resistor
  • C1,C10___________1u NP 25V Capacitor
  • C2,C12__________22u 63V Electrolytic
  • C3,C11_________0.47u 400V Polyester
  • C4,C7,C8,C9_____100n 400V Polyester
  • C5,C6,C13,C14___220u 63V Electrolytic
  • U1,U2__________TDA2050V 32W Audio Power Amp

For more information see the manufacturers data sheet

Author and source

author: Andy Collinson
source: www.zen22142.zen.co.uk

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