I need someone who knows about electronic device

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lab_3_sep_20_2016.docx
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Screenshot for Circuit 1:

Screenshot for Circuit 2:

Table 3-1:

Nominal

Measured

R1

1k Ω

984 Ω

RL1

1k Ω

985 Ω

RL2

680 Ω

678 Ω

Table 3-2:

RL = 1000 Ω

Ch1 ( max )

19.7 V

Ch1 ( min )

13.3 V

Vrpp

19.7 – 13.3 = 6.4 V

Ch2 ( max )

4.8 V

Ch2 ( min )

4.2 V

Vout

4.8 – 4.2 = 0.6 V

Table 3-3:

RL = 680 Ω

Ch1 ( max )

19.7 V

Ch1 ( min )

13.5 V

Vrpp

19.7 – 13.5 = 6.2 V

Ch2 ( max )

4.8 V

Ch2 ( min )

4.0 V

Vout

4.8 – 4.2 = 0.8 V

Table 3-4:

RL

1000 Ω

680 Ω

IR1

(19.7 – 4.8 ) / 984 = 15.14 mA

(19.7 – 4.8 ) / 984 = 15.14 mA

ILoad

4.8 / 985 = 4.87 mA

4.8 / 678 = 7.08 mA

IZener

15.14 mA – 4.87 mA = 10.27 mA

15.14 mA – 7.08 mA = 8.06 mA

Sample calculations for 1k Ω & 680 Ω:

IR1: (VAPK – VBPK) / R1 = (19.7 – 4.8) / 984 = 15.14 mA

ILoad: VBPK / RL1 = 4.8 / 985 = 4.87 mA

IZener: IR1 - ILoad = 15.14 mA – 4.87 mA = 10.27 mA

ILoad: VBPK / RL1 = 4.8 / 678 = 7.08 mA

IZener: IR1 - ILoad = 15.14 mA – 7.08 mA = 8.06 mA

Q: What effect does lowering the load resistance have on the regulation of the circuit?

117.8Vrms

60Hz

0°

10µF

R1

1kΩ

RL

1KΩ

D2

D1

D3

D4

BA

Circuit 1

117.8Vrms

60Hz

0°

10µF

R1

1kΩ

RL

680Ω

D2

D1

D3

D4

BA

Circuit 2