VT400 PerkinElmer Optoelectronics, VT400 Datasheet - Page 63

• Manufacturer Part Number: VT400
• Description: Photoconductive Cells and Analog Optoisolators (vactrols)
• Manufacturer: PerkinElmer Optoelectronics

Application Notes—Analog Optical Isolators
Basic Circuit Configuration
Figure 1c. Feedback Resistor Control
Figure 1b. Series Input Control
Figure 1a. Shunt Input Control
58
Resistance
Fixed, Low
Variable
Variable
Input
------------------------------------------- -
1
R
R
3
Gain
-------------------------- -
R
-------------------------- -
R
LDR
R
1
1
R
LDR
+
+
+
R
LDR
R
R
1
R
e
---------- -
+
e
o ut
LDR
LDR
in
2
R
+
2
R
3