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esis.
The output of the operational amplifier
is
normally
positive
to turn the
relay on and goes negative
to turn
it
off.
4.5
CLIP CIRCUIT
In
the clip detector circuit, transistor Q36
is
normally
turned
ON,
shunting current away from CLIP LED DSl.
The peak
output voltage
of the
amplifier
as
it
approaches
the
power supply
rail voltage
is
sensed through diode CR24 and resistor
R71
and
turns the transistor OFF, thereby turning the LED
ON.
Capacitor
C38
provides peak stretching
to
enable transient peaks
of short
duration
to be seen.
4.6
POWER SUPPLY
The power supply
is
conventional.
The AC voltage from
transformer
Tl
is
rectified
by bridge
rectifier
BRI and
filtered
by the large storage capacitors
C41 - C44.
The resulting high
voltage, high current DC
is
used
in the
voltage and output ampli-
fier stages.
An
additional winding from
the
transformer
is
rectified and regulated
to
supply
+
15
VDC for
the
operational
amplifiers, and
is
rectified
and fTltered to supply
+ 24
VDC
for
the
relay
coil.
- 25 -
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