Function Generator

Purpose:The purpose of this experiment is to construct a function generator capable of taking a DC input and producing different outputs.The three desired outputs are a sinusoidal wave, a square wave, and a triangle wave.The function generator should also include a DC offset adjustment as well as amplitude control for the output waveform.
Components to be used:DC power supply ( +15 Volts), 3 1N4148 diodes, one LED, 4 741 op-amps, 3 0.01 micro-farad capacitors, 2 1 micro-farad capacitors, 1k-ohm resistor, 2.2k-ohm resistor, 8.2k-ohm resistor, 10k-ohm resistor, 1 ganged 10k-ohm potentiometer, 2 10k-ohm potentiometers, 15k-ohm resistor, 2 18k-ohm resistor, 100k-ohm potentiometer.
1. Construct the Wein-bridge oscillator as shown in figure 1.Test output point A for sine wave, adjust potentiometers to change amplitude and frequency.
2. Construct the Schmitt trigger shown in figure 2.Connect input point A to output point A.Test output point B on the Schmitt trigger, the output should be a square wave.
3. Construct the integrator shown in figure 3.Connect input point B to output point B.Test output point C on the integrator, the output should be a triangle wave.
4. Construct the circuit shown in figure four.Adjust the potentiometer to adjust the DC offset.
Discussion of Results:By following the above procedure, you should develop the desired function generator.The end result should match figure 5.Along the way a couple of problems were encountered.First, by using a 741 op-amp in the second stage (Schmitt trigger), a perfect square wave could not be obtained.By substituting a 318 op-amp it corrected the problem.The 318 gave a cleaner output because of its higher slew rate.The other problem occurred in the third stage, the integrator.The output of this stage using the called for capacitor (0.047 micro-farads) gave a distorted output.By adding a

Leave a Reply

Your email address will not be published. Required fields are marked *


I'm Harold

Would you like to get a custom essay? How about receiving a customized one?

Check it out