# Lab 10 RS

**Lab 10 Unregulated power supply**

Use a transformer for the experiment.

here is a description of the transformer.

File:TF EIM 241 transformer.pdf

# Half-Wave Rectifier Circuit

1.)Consider building circuit below.

**Determine the components needed in order to make the output ripple have a **
less than 1 Volt.

The output ripple can be found by

Taking AC signal from outlet equals to

my input pulse width is and using say I need my current to be:

Taking

that satisfy the condition above for current so my output ripple becomes less than 1 Volts.

**List the components below and show your instructor the output observed on the scope and sketch it below.**

I have used the following components:

The current through the circuit can be found as

where

.

And the current becomes

So my output ripple becomes

As we can see from the sketch above my output voltage has ripple about , ripple time period is the same as input time , and the output DC voltage is about

# Full-Wave Rectifier Circuit

**Determine the components needed in order to make the above circuit's output ripple have a **
less than 0.5 Volt.

The output ripple in this case can be found by

Because we are now using

instead of than in previous case for half-wave rectifier theoretiacally we will be able to make two times less then in previous case just by using exactly the same elements and input parameters as before. But here I realized by experiment that my Zener diode has low power limit and for this kind of circuit I need to use more powerful diode. Instead of 4.7 Zener Diode which has power limit 0.5 W I used rectifier diode 1N4001 which has power limit 50 W.

**List the components below and show your instructor the output observed on the scope and sketch it below.**

I have used the following components:

Because now I need to replace by my output voltage now becomes two times less:

Now my DC output voltage becomes about

and ripple you can not even see for that scale.

To see ripple I used the AC mode of scope and they are plotted below. As we can see from this sketch my output voltage has ripple about , and the ripple time period now is two times less than input time period and is about .

Now I have almost perfect output DC current with small ripple.

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