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 [...]
Musical Fidelity would let you believe that this is a Class A design. However, in common with most commercial amplifiers, it is a class AB amplifier – it simply has a rather high standing current in the output stage, which results in the first 8 watts or so being class A. This is a curious [...]
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 [...]
Entries (RSS)
Link electronics
Copyright © 2010. All rights reserved. Any circuit and content represented are property of owner.