This book considers electronic devices applied to process analog signals in in
strument making, automation, measurements, and other branches of technology.
They perform various transformations of electrical signals: scaling, integration,
logarithming, etc. Such devices are considered in tutorials on electronics. The need
in their deeper study is caused, on the one hand, by the great demands of extending
the range of input signals, as well as increasing the accuracy and speed of such
devices, which usually receive insufficient attention.