Figure 17.6 shows a typical circuit which generates square waves.
The period for one cycle is represented by
t = 0.7C
X
R
2
+ 0.7C
2
R
X
s (C in farads)
= 0.7(C,/?
2
+
C
2
R
X
)
If
C = C
{
= C
2
and R = R
x
= R
2
then
t = 0.7 x 2 x CR
since
1
fo
~ 0.7(C,/?
2
+
C
2
R
X
)
1
= Hz
0.7 x 2 x CR
Figure
17.5
then
Oscillators 303
Output
1
Output
2
Figure
17.6
Example 13 Calculate the frequency of a multivibrator when
C = C, = C
2
= 0.01 u.F and R = R
x
= R
2
= 15 kft.
10
6
Jo
0.7 x 2 x 0.01
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