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How does a logarithmic amplification circuit look like? And...

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Question by Kathy
Submitted on 8/17/2003
Related FAQ: FAQ: rec.audio.* Retail 7/07 (part 9 of 13)
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How does a logarithmic amplification circuit look like? And how do I design one to amplify the pulse received by an ultrasonic speaker? I'd like to amplify the signal received by the ultrasonic transducer so that the pulses varying only a little even when the pulses themselves varying a lot


Answer by EdwardM
Submitted on 11/7/2003
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Log amplifiers usually apply a transistor
junction in the feedback path of an opamp.
If you look up some application notes from
National Semiconductor, Philips, Burr-Brown
(just to mention a few), you should find something.

However, for your application it seems
more appropriate to pass the signal through
a comparator (LM339 or alike) or a Schmitt-
Trigger (CD4093). The information you need
probably is in the time difference between
sending and receiving and not in the amplitude. So "clipping" it will do the job.


 

Answer by ME
Submitted on 3/9/2004
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i like wanking how about you??

 

Answer by vinay
Submitted on 6/9/2004
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i would like to get the details of logarithmic and antilogarithmic circuit details


 

Answer by
Submitted on 12/19/2006
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Answer by nay nay
Submitted on 1/4/2007
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how does a series circuit look like

 

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