Simple Logarithmic Dc Amplifier
- 1 November 1960
- journal article
- research article
- Published by AIP Publishing in Review of Scientific Instruments
- Vol. 31 (11) , 1222-1225
- https://doi.org/10.1063/1.1716857
Abstract
A logarithmic dc amplifier circuit is described using a type 12AU7A dual triode. The amplifier output follows the equation E0=9.00−2 log10Ei with an accuracy of 2% or better for positive input voltages from 5 to 500 v. The circuit parameters may be easily adjusted to compensate for tube aging and differences in characteristics between individual tubes. Output voltage drift is low and relatively independent of filament voltage drift.This publication has 1 reference indexed in Scilit:
- Logarithmic Characteristic of Triode Electrometer CircuitsReview of Scientific Instruments, 1959