Use the LED forward voltage drop that you measured in ECE 112 lab for the Green LED. The Zener Diode, D1 and D3, has a reverse breakdown voltage of 4.7 volts and a forward voltage drop of.7 volts. Q1 has a VBE of .7 volts. How much current is going through the Green LED if the Beta for Q1 is 100? How much current is going through the Green LED if the Beta is 300? D3 V1 12 D1

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Use the LED forward voltage drop that you measured in ECE 112 lab for the Green LED.
The Zener Diode, D1 and D3, has a reverse breakdown voltage of 4.7 volts and a forward
voltage drop of .7 volts. Q1 has a VBE of .7 volts. How much current is going through
the Green LED if the Beta for Q1 is 100? How much current is going through the Green
LED if the Beta is 300?
D3
V1
12
D1
R2
500
D2
R1
Q1
GREEN
20k
NPN
V2
Transcribed Image Text:Use the LED forward voltage drop that you measured in ECE 112 lab for the Green LED. The Zener Diode, D1 and D3, has a reverse breakdown voltage of 4.7 volts and a forward voltage drop of .7 volts. Q1 has a VBE of .7 volts. How much current is going through the Green LED if the Beta for Q1 is 100? How much current is going through the Green LED if the Beta is 300? D3 V1 12 D1 R2 500 D2 R1 Q1 GREEN 20k NPN V2
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