Hello,

I have come across Logarithmic amplifiers and wanted to know what they are typically used for and why?

I'd appreciate it!

Thanks!

 

they can be used in analog computers (multipliers, dividers, and log/exponential functions), or level compressors (for speech or music for example), to name a few.

 

Hello,

I have come across Logarithmic amplifiers and wanted to know what they are typically used for and why?

I'd appreciate it!

Thanks!

http://www.electronics.dit.ie/staff/ypanarin/Lecture Notes/DT021-4/6LogAntiLogAmplifiers.pdf

Here's a great primer.

eric

 

I used it to approximate a sine wave from a triangle wave in this thread...

http://forum.allaboutcircuits.com/showthread.php?t=12405

 

In the 70's, HP made a bench instrument that was a logarithmic amplifier. I remember using one briefly in the early 80's. They were handy because they measured a voltage with about 2 significant digits over a wide range and there was no need to change range switches. As I recall, they also had a DC output proportional to the log of the signal amplitude.

 

Electronic slide rule, anyone? <sigh> I doubt anyone under 40 remembers what one is.

Sometime I feel old, sometimes I'm told I'm old. Being an advisor for a boy's youth group (DeMolay) will do that.

They try to do it nicely though.

 

Oh ok, thanks for all the help guys! I take it that their fairly similar to op amps and in amps? Thanks!