Question

5. Part 5: Zener diode voltage regulator using the mains supply 1. Build the circuit shown in Fig. 1-2 below using a BZX85C4V7 Zener diode (For Diode simulations in QUCS use 1N4732 to replace BZX85C of part 5 and LM140-5V to replace 7805 of part 6), and four 1N4004 diodes for the rectifier. The primary of the transformer is to be connected to the mains supply (220V, 50Hz) and deliver at the secondary a voltage of about 10V peak at 50Hz (the lower the voltage, the better). 2. Use for this power supply $R_s$=620 ?, $R_B$=1 M? and C=100 µF (a smaller capacitor may be also used). 3. Use an Oscilloscope to visualize the $V_{out}$ waveform. 4. Change the secondary voltage to several values (0 to 15 V) and note the output Voltage. 5. Discuss the changes observed at the output compared to part 4.

          5. Part 5: Zener diode voltage regulator using the mains supply
1. Build the circuit shown in Fig. 1-2 below using a BZX85C4V7 Zener diode (For Diode
simulations in QUCS use 1N4732 to replace BZX85C of part 5 and LM140-5V to replace 7805
of part 6), and four 1N4004 diodes for the rectifier. The primary of the transformer is to be
connected to the mains supply (220V, 50Hz) and deliver at the secondary a voltage of about
10V peak at 50Hz (the lower the voltage, the better).
2. Use for this power supply $R_s$=620 ?, $R_B$=1 M? and C=100 µF (a smaller capacitor may be
also used).
3. Use an Oscilloscope to visualize the $V_{out}$ waveform.
4. Change the secondary voltage to several values (0 to 15 V) and note the output Voltage.
5. Discuss the changes observed at the output compared to part 4.

5. Part 5: Zener diode voltage regulator using the mains supply
1. Build the circuit shown in Fig. 1-2 below using a BZX85C4V7 Zener diode (For Diode
simulations in QUCS use 1N4732 to replace BZX85C of part 5 and LM140-5V to replace 7805
of part 6), and four 1N4004 diodes for the rectifier. The primary of the transformer is to be
connected to the mains supply (220V, 50Hz) and deliver at the secondary a voltage of about
10V peak at 50Hz (the lower the voltage, the better).
2. Use for this power supply Rs=620 ?, RB=1 M? and C=100 µF (a smaller capacitor may be
also used).
3. Use an Oscilloscope to visualize the Vout waveform.
4. Change the secondary voltage to several values (0 to 15 V) and note the output Voltage.
5. Discuss the changes observed at the output compared to part 4.

Added by Marie K.

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