[sdiy] Log amplifier circuits

[Neil Johnson]

Tim Stinchcombe wrote:
>> anyone have any ideas or circuit references for me to look at ?
>
> Jung's 'IC Op-Amp Cookbook' (both issue 1&  3 that I have) have a fairly
> detailed circuit giving log10(I1/I2), which in issue 1 is claimed to give a
> 100dB range for the currents. Not much help if you were after online
> resources, but I think maybe it shows not to give up...!?

As Tim says.

Also, the web has some interesting documents that google has found:

http://www.ti.com/lit/an/snoa575a/snoa575a.pdf

	(includes some discussion about music synthesizers!)

http://www.analog.com/static/imported-files/tutorials/MT-077.pdf

	A basic tutorial from AD.

Cheers,
Neil
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