13
C.
OUTPUT CIRCUIT
The
waveform
of
the
output
voltage can be selected with SK3.
The
sine-
wave
is
obtained by connecting the amplifier
output
direct to the atte-
nuator
R2.
To
obtain the squarewave volta
ge
, the sinewave signal
is
applied to
an
amplitude limiter TS6-TS7.
The limiting action can be adjusted with potentiometer R20.
Diode
GR3
serves for rectification
of
the sinewave controI voltage
and
thus determines the working
point
of
TS6.
The
amplitude
of
the squarewave
output
signal
is
stabilised by the biased
diode
GR2.
The bias voltage for
GR2
is
provided by voltage divider
R29-GRl.
D. POWER SUPPLY
The instrument
is
supplied by two series connected 9 V batteries.
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