• Home
  • Download PDF
  • Order CD-ROM
  • Order in Print
Figure 3-44A.Unijunction sawtooth generator. SCHEMATIC
Figure 3-45A.Improved unijunction sawtooth generator

Neets Module 09-Introduction to Wave-Generators and Wave-Shaping Circuits
Page Navigation
  125    126    127    128    129  130  131    132    133    134    135  
3-40 Figure 3-44B.—Unijunction sawtooth generator. EMITTER WAVEFORM. The circuit operation from now on is just a continuous repetition of the actions between T2 and T4. The capacitor charges until the emitter becomes forward biased, the unijunction conducts and C1 discharges, and Q1 becomes reverse biased and C1 again starts charging. Now, let's determine the linearity, electrical length, and amplitude of the output waveform. First, the linearity: To charge the circuit to the full 20 volts will take 5 time constants. In the circuit shown in figure 3-44, view (B), C1 is allowed to charge from T2 to T3. To find the percentage of charge, use the equation: This works out to be about 57 percent and is far beyond the 10 percent required for a linear sweep voltage. The linearity is very poor in this example.






Western Governors University

Privacy Statement
Press Release
Contact

© Copyright Integrated Publishing, Inc.. All Rights Reserved. Design by Strategico.