Equipment: You must make up a complete equipment list and have your instructor review it before you start.

• 4 - 1N4002 Diodes
• 1 - 1N751A Zener Diode
• 1 - 7805 Voltage Regulator
• 1 - 12 V CT Transformer
• 1 - filter capacitor, to be determined by your filter design
• 1 - LED
• resistors

• To design, build and test a Zener regulator circuit
• To design, build and test a 5 V_DC regulated power supply
• To design a filter
• To design using power ratings
• To measure ripple voltage and obtain the ripple factor

1. (HW) Design Zener regulator circuit that has the specifications below. Draw and label the schematic of this circuit Figure #1 - 5.1 V Zener Regulator Circuit. Compute the output voltage corresponding to v _{S MIN} and to v _{S MAX}.

 

2. (HW) Assemble your design in part a).

 

3. Verify the correct operation of your design in part a). Take enough readings to prove this. Write down the values for the input and output voltage on Table # 1.

 

4. Compute the load regulation value.

• Input: 8.13 V_DC + 1.87 V_DC

• Output (unloaded): 5.1 V_DC + 5 %

• Output (loaded): 5.1 V_DC + 5 %

1. (HW) Design a 5 V_DC regulated power supply that has the specifications below. Draw and label the schematic Figure # 2 - 5 V_DC regulated power supply.

 

2. Build your design in part a).

 

3. Plot the output voltage of your design (loaded) and measure the ripple.

• Line input voltage: 117 V_rms

• Regulated output voltage: 5 V_DC + 5%

• Load: resistive

• Power Consumed by the Load: 175 mW_DC

• Indicator: A red LED must be used to indicate that the regulated output voltage is available to the load.

• Ripple: minimum

Explain the design considerations and characteristics of each of the circuits in this experiment: a) for the Zener regulator, and b) for the 5 V_DC regulator