Determine the turns ratio of the transformer calculate the

Question

Lab Exercise: Electronics Principles

Zener Regulators

In this lab you will construct a regulated DC power supply. You will observe the behavior of the circuit as a function of load current.

Equipment

1. Transformer
2. Oscilloscope

Materials

1. (4) 1N4002 Diodes
2. 10 μF Capacitor
3. 1N5230 Diode (Zener)
4. (2) 1 kΩ Resistor
5. (1) 680 Ω Resistor

Procedure

1. Open Multisim (draw the circuits) and Benchvue (take the screenshots)

2. Measure all (3) resistor values and record them.

R₁ = R_L1 = R_L2 =

3. Configure the circuit in Figure 3-1 above.

4. Measure the secondary voltage. Record the rms or peak voltage. V_sec =

5. Determine the turns ratio of the transformer. n =

6. Use the oscilloscope to measure the max and min of the ripple voltage (Point A) of the filter (Channel 1) and the max and min output voltage (Point B)(Channel 2). Take a screenshot and save.

7. Calculate the peak currents, I_R1, I_L, and I_Z. [Hint: Start with ????1 = ????(????) / (??₁+??_L)]

8. Replace RL with the 680 Ω resistor and repeat steps 5 and 6.