LM139, LM239, LM339
Figure 14. Time delay generator
V
C
C
= +15 V
Typical applications
10 kΩ 15 kΩ
200 kΩ
10 MΩ
10 kΩ
1/4
LM139
3
kΩ
V
3
V
03
V
CC
t
o
3k
Ω
t
3
10 kΩ
V
CC
0
1/4
LM139
51 kΩ
V
C1
V
2
0.001
μF
10 kΩ
10 MΩ
t
o
t
A
1/4
LM139
V
O2
V
CC
V
(ref.)
t
o
3
kΩ
t
2
Input gating
signal
V
CC
10 MΩ
51 kΩ
10 kΩ
1/4
LM139
V
3
V
C1
V
2
V
1
0
t
0
t
1
t
2
t
3
V
O1
V
CC
V
1
t
t
4
51 kΩ
t
0
t
1
Figure 15. Low frequency op amp with offset
adjust
5V
Offset
adjust
100 kΩ
5V
Figure 16. Zero crossing detector (single
power supply)
5V
100 kΩ
R
2
R
S
R
1
1 MΩ
1 MΩ
15 kΩ
1/ 4
LM139
100 kΩ
5.1 kΩ
5.1 kΩ
e
l
2N 2222
5.1 kΩ
1/ 4
LM139
e
l
~
0.5
μ
F
R1
100 kΩ
1 kΩ
e
o
1N4148
20 MΩ
10 kΩ
Figure 17. Two-decade high-frequency VCO
V
CC
100 kΩ
V
CC
100 kΩ
Frequency control
voltage input
Vcontrol
500 pF
1/ 4
LM139
3
kΩ
5.1 kΩ
0.01
μF
V
CC
/2
1/ 4
LM139
3
kΩ
0.1
μF
20 kΩ
50 kΩ
20 kΩ
Output 1
Output 2
1/ 4
LM139
V
CC
/2
V
CC
= +
30
V
Vcontrol +50 V
+250 mV
700 Hz
fo 100 kHz
Doc ID 2159 Rev 3
9/19
STMICROELECTRONICS [ STMICROELECTRONICS ]
