### Objectives

In this lab, we want to prove the operation of the diode limiter. I mean we should put levels Forbidden the signal from going above or below these levels .this levels are equal to voltages of a diode. This limiter also it's called (a clipper)

We also have the damper: which adds a dc voltage to the input

 Oscilloscope

### Required Equipment

15-kÎ© resistor 1/4 W
1N4001 silicon rectifier diode
0-15 V dc power supply
5-kÎ© potentiometer
Dual trace oscilloscope
Breadboarding socket
Signal generator

## Part one: The Limiter

### Procedure

Wire the limiter circuit shown in figure 1 –1(A). Set the oscilloscope to the following approximate setting shown in the figure:

 Figure 1-1(A): Schematic diagram of circuits

Channels 1 and 2: 1V /division, dc coupling

Time base: 1ms / division

Now connect the signal generator to the breadboard. Then, the signal generator output level must be adjusted at 6 V peak to peak at a frequency of 200 Hz.

Now reverse the polarity of the diode in the circuit as shown in figure 1-1(B).

 Figure 1-1(B)

Now connect the circuit as shown in figure 1-1(C). Apply power to the breadboard and adjust the potentiometer so that the dc voltage (Vdc) is +1.5 V. Connect the signal generator. Set at 6 V peak to peak.

 Figure 1-1(C)

The resistance of the potentiometer must be varied from one extreme to the other.

Now reverse the polarities of both diode and dc power supply in the circuit as shown in figure1-1(D).

 Figure 1-1(D)

Another time, the resistance of the potentiometer must be varied from one extreme to the other.

## Part two: The clamper

### Required Equipment

10-kÎ© resistor .1/4 W

1N4001 silicon rectifier diode

10-micro Farad electrolytic capacitor 25V

dual trace oscilloscope

breadboarding socket

signal generator

### Useful formula

Camber time constant

1) 10RLC>>Tinput

Peak output voltage

2) Vout (peak) = Vin (peak to peak) - Vd

### Procedure:

Wire the clamber circuit shown in figure2-1

 Figure 2-1

Now connect the signal generator to the breadboard. The signal generator output level must be adjusted to be at 5 V peak to peak at a frequency of 1 kHz.

Now the polarity of the diode in the circuit must be reversed. And repeat steps 1,2.

### Conclusion:

In this lab we can see that there is a diode limiter equal to the diode's potential, and we can also control it by DC source voltage.

### Resources:

lab of electronic device
electronic device lab manual

#### No comments:

Powered by Blogger.