Audio preamplifier circuit

Published:2011/6/16 6:25:00 Author:John | Keyword: Audio preamplifier | From:SeekIC

The following figure shows the audio preamplifier matched with 50Ω, which is an improved version of Lawellen circuit. Just as Campbell said, the gain of this circuit is about 40dB and noise value is about 5dB. And the range of input signals has no intention to disturbances (10nV ~ 10mV). These specifications make it available as the amplifier matched with DBM. Just as Lawellen’s circuit, Campbell also uses circuit with the grounded-base input amplifier (Q1) and active isolators (Q2). Beside, an emitter follower / buffer amplifier (Q3) is added.



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