Schematic DIY KitLogarithms Analog arithmetic circuit
Although nowadays most of the signal processing DSP is done, there are certain applications for analog computing circuits. of logarithms is one such. It is eg used when signals must be processed with a very high dynamic range. But even with Extra-arithmetic operations such as root-pulling, etc. it can be used.
Here links to schematics of logarithms

Here you will find Schematic Circuit Diagram for DIY and further information on Logarithms
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Logarithms basic circuit www.loetstelle.net/grundlagen/operationsverstaerker/opamp_4.php
Logarithms with Operationsverstaerker and transistors www.elexs.de/messen6.html
Basics of analog signal processing www.space.unibe.ch/physprak/skripten/winter_new/elektronik2.pdf

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