FuMVave
bridge rectifiers are used in a wide range of pow-
er
suppiies.These
rectifier circuits are among the most effi-
cient and cost effective for many applications.
Refer to Fig. 47 for the following steps.
1
.
2
,
Be sure the 808 power plug is Not connected to
a power outlet.
Mount diodes
D5,
D6, D7 and D8 on the PCB Be
sure the banded ends of the diodes are oriented
the same as the diode outlines that are silk
screened on the PCB. Using a heat sink, solder
each diode lead to the
PCB,
and cut off any
excess lead length.
FULLWAVE
BRIDGE RECTIFIER EXPERIENCE
P~pose:
To
obsewe
the voltage waveform produced by a
FullWave
Bridge Rectifier circuit.
Equipment: Oscilloscope
1. Be sure the 808 power plug is Not connected to
a power outlet.
Refer to Fig. 47 for steps 3 through 6.
2
.
3
.
-
4.
5
.
6
.
7
.
Solder a 1.5
kOhm
(brown-green-red)
5
Watt re-
sistor toTP7 and
TP9.
Cut the leads off close to
the test points. This resistor is for testing pur-
poses and will be left in place until the 5 Volt reg-
ulator is
installedm
Adjust the scope to display a 30 Volt (peak to
peak) 60
Hz
signal. Set the vertical (Y) input
coupling to DC.
Connect the scope ground lead to TP7 and the
input probe to
TP’
9-
Plug the 808 Power Supply plug into an outlet.
Turn the Power Switch ON. Observe the wave-
form displayed on the scope.
It
should look like
Fig. 45. Both the
FulLWave
Center-Typed
and
the
FullMIave
Bridge produce the same wave-
form. Figure 48 illustrates current flow in a
Full-
Wave Bridge Rectifier circuit.
Turn the 808 Power switch Off and disconnect
the power plug from the outlet. Disconnect the
scope ground lead and input probe from the test
points.
This completes the
FullM/ave
Bridge Rectifier
Test. Have your instructor initial your progress
guide.
FIG. 47
FULLWAVE
BIYOGE
RECTIFIER
ClRCUlT
FIG. 48
26
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