Line_operated_IC_audio_amplifier

Published:2009/7/23 21:10:00 Author:Jessie | From:SeekIC

This amplifier operates from a +98-V supply (the rectified line voltage). Such amplifiers are often found in consumer products. Virtually any high-voltage transistor (capable of about 100 V from collector to emitter) can be used for Q1, which is biased and controlled by the LM3900 Norton amplifier (chapter 11). The magnitude of the dc biasing voltage, which appears across the emitter resistor of Q1 is controlled by the resistor between the (-) input of the LM3900 and ground.



Reprinted Url Of This Article:
http://www.seekic.com/circuit_diagram/Audio_Circuit/Line_operated_IC_audio_amplifier.html

Print this Page | Comments | Reading(3)