1. For a transformer output of 18 V and a filter capacitor of 250 mF, calculate the minimum input voltage when connected to a load drawing 400 mA. What is the output volage of the IC regulator circuit in Fig.1? The manufacturer's specification sheets of 7800 series is provided in the table below. 120 V rms 000 000000000 V-18 V IN OUT 7808 C= 0.01μF 250 μF GND Vo=? Fig. 1 IC regulator circuit Table 1 Voltage Regulators in the 7800 Series IC Part Output Voltage (V) Minimum V; (V) 7805 +5 7.3 7806 +6 8.3 7808 +8 10.5 7810 +10 12.5 7812 +12 14.6 7815 +15 17.7 7818 +18 21.0 7824 +24 27.1

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1. For a transformer output of 18 V and a filter capacitor of 250 mF, calculate the minimum input
voltage when connected to a load drawing 400 mA. What is the output volage of the IC regulator
circuit in Fig.1? The manufacturer's specification sheets of 7800 series is provided in the table
below.
120 V rms
000
000000000
V-18 V
IN
OUT
7808
C=
0.01μF
250 μF
GND
Vo=?
Fig. 1 IC regulator circuit
Table 1 Voltage Regulators in the 7800 Series
IC Part
Output Voltage (V)
Minimum V; (V)
7805
+5
7.3
7806
+6
8.3
7808
+8
10.5
7810
+10
12.5
7812
+12
14.6
7815
+15
17.7
7818
+18
21.0
7824
+24
27.1
Transcribed Image Text:1. For a transformer output of 18 V and a filter capacitor of 250 mF, calculate the minimum input voltage when connected to a load drawing 400 mA. What is the output volage of the IC regulator circuit in Fig.1? The manufacturer's specification sheets of 7800 series is provided in the table below. 120 V rms 000 000000000 V-18 V IN OUT 7808 C= 0.01μF 250 μF GND Vo=? Fig. 1 IC regulator circuit Table 1 Voltage Regulators in the 7800 Series IC Part Output Voltage (V) Minimum V; (V) 7805 +5 7.3 7806 +6 8.3 7808 +8 10.5 7810 +10 12.5 7812 +12 14.6 7815 +15 17.7 7818 +18 21.0 7824 +24 27.1
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