文档介绍：Wireless World, December 1970
Simple Class A Amplifier
A postscript to the design published last year
by J. L. Linsley Hood
The author has had the benefit of an extensive and frequently helpful correspondence with readers
following the publication of the circuit design. Attention has been drawn to some obscurities in the
original article and to certain possible improvements in the design. Details are given below.
Power supply
Although much interest was aroused among constructors by the good technical (and audible)
performance given by the amplifier, it is clear that the principal feature in the eyes of many users was the
relative simplicity of the circuit. This being so it must have seemed a pity that the power-supply unit was
plex. However, the purpose of this power-supply design was to avoid possible
degradation of the amplifier performance by . ripple. The sawtooth ripple voltage across the reservoir
capacitor in a class-A amplifier drawing some 2-3A will be many times greater than in a class-B system,
particularly at the audibly important low-signal levels.
However, a number of measurements have been made since the publication of the original article on an
amplifier of this type, operated from a simple supply unit of the type shown in Fig. 1. There is little
difference in the performance above 100Hz either in total h