A diode limiter circuit, also known as a clipper circuit,  is a wave shaping circuit that takes an input waveform and clips or cuts off a portion of the wave - either from the top half, the bottom half, or both halves.
Limiter circuits can be used in a variety of applications, such as providing under- and over-voltage protection to ensure that the output voltage never exceeds a certain level, thereby protecting following circuits.
In the circuit shown below in Figure 5-11:
Figure 5-11
the output waveform is limited to the voltages set by the DC sources 𝐸1 and 𝐸2:
Figure 5-12
Limiter Circuits

Construct the positive limiter circuit shown in Figure 5-13.
Figure 5-13
Ensure you trigger the DSO to get a stable display. Set up the display so that the two waveforms are positioned at
0 V . Take a screenshot or "save to USB" and show the waveforms in Plot 5-5 below:
Positive limiter waveform:

Plot 5-5
Now turn the diode around to construct the negative limiter circuit shown in Figure 5-14.
Figure 5-14
Ensure you trigger the DSO to get a stable display. Set up the display so that the two waveforms are positioned at
0 V . Take a screenshot or "save to USB" and show the waveforms in Plot 5-6 below:
Negative limiter waveform:


Plot 5-6
Construct the circuit shown in Figure 5-15. Use channel 1 of the DC power supply for the +3.3 V DC source (do not use the fixed + 3.3 V DC source). The diodes are of the 1N4148 type.
Figure 5-15
Ensure you trigger the DSO to get a stable display. Take a screenshot or "save to USB" and show the waveforms in Plot 5-7 below:
Limiter waveform:

Plot 5-7
Construct the circuit shown in Figure 5-16.
Figure 5-16
Take a screenshot or "save to USB" and show the waveforms in Plot 5-8 below:
Limiter waveform:

Plot 5-8
Reduce the frequency of the input sinusoid to 1 Hz. Observe the LEDs in the circuit (do not observe the DSO waveforms).
Explain your observation:
