Audio Amplifier | Electronic Project Circuits

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25W Audio Power Amplifier by LM1875

This audio power amplifier project is based on LM1875 amplifier module from National Semiconductor. It is able to deliver up to 30W of power using an 8 ohm load and dual 30V DC power supplies. It is designed to operate with minimum external components with current limit and thermal shutdown protection features . Other features include high gain, fast slew rate, wide power supply range, large output voltage swing and high current capability.

Read More Source: http://www.electronics-project-design.com/poweramplifier.html Thank you.

1 comment - What do you think? Posted by admin - March 5, 2008 at 10:31 pm

Categories: Power Amplifier Tags: 25 watt amplifier, audio amplifier, Cheap amplifier, LM1875

100W Audio Amplifier Transistor by BDW84 , BDW83

The circuit works from a symmetrical ±40 VDC power supply and draws a maximum current of 2.6 A. The input circuit of the amplifier is a differential amplifier built around Q4 and Q5 that employ DC feedback thus preventing any DC voltage from appearing across the speaker with the usual destructive results. Q11 acts as a current source and ensures that the input stage draws a constant current of 1 mA.

Source:http://english.cxem.net/amplifier/amplifier25.php