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SECTION IV
PRINCIPLES OF OPERATION
4-1 .
INTRODUCTION .
4-2 .
The Model 204C is a Wien - bridge oscillator .
A block diagram
of the circuit
is shown in Figure 4-1 .
This section includes a block diagram
description that
consists of a discussion of each section of the block diagram .
4-3 .
BLOCK DIAGRAM DESCRIPTION .
4-5 .
The oscillator bridge consists of two parts, the frequency selective network
and the amplifier negative feedback network .
The frequency selective network is
CF , RF ,
CF ' ,
and RF ' .
The negative feedback divider is Rf,
Rf ' ,
and the AGC
block .
BRIDGE
AMPLIFIER
FREQUENCY
DIAL
600n
ATTENUATOR
OUTPUT
SYNC
SRI
PEAK
COMPARATOR
204C - 8-1505
7.2V REF
Figure 4-1 .
Model 204C Block Diagram
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