Page 218 - Op Amps Design, Applications, and Troubleshooting

200 OSCILLATORS

below 1000 ohms. For this example, let us use a 1.8-kilohm resistor for R 4. We can
utilize the results of our previous calculation and determine the value of Q.

We will select a standard value of 0.47 microfarad for Q.
We can utilize Equation (4.27} to compute the required value for K 3. Its value
will establish the maximum time for the positive alternation.

The nearest standard potentiometer value is 20 kilohms. We will use a 20-kilohm
variable resistor for K 3.
are
Resistors JRj and R 2 computed in the same way as R 3 and R^ except that
Equation (4.28) is utilized along with the times associated with the negative alter-
nation. These calculations are

and