Stable optocoupler


Posted on Dec 16, 2012

A circuit stabilizes the current-transfer ratio (CTR) of an optically coupled isolator used as a linear transducer. The optocoupler produces a voltage output that is proportional to—but electrically isolated from—the voltage input. However, the output voltage is directly affected by changes in the CTR, and the CTR can change substantially with temperature and current. To a lesser extent the CTR changes with time over the life of the optocoupler. The circuit employs a feedback circuit containing a second optocoupler.


Stable optocoupler
Click here to download the full size of the above Circuit.

The feedback signal tends to oppose changes in the overall CTR.




Leave Comment

characters left:

New Circuits

.

 


Popular Circuits

R/C Thermal Peak Detection NiCd Charger
Laser Target Finder circuit
18 LED sequencer timer
am/fm radio & Pilot 100 stereo demodulator
MICROCONTROLLER BASED AUTOMATIC ROOM LIGHT CONTROLLER
op amp Basic Frequency Control Circuit
h bridge circuit
computer-circuits
50 watt power MOSFET amplifier circuit diagram
One transistor code lock
facelift for the 7MHz TRX
games timer 2
servo motor control through keypad
Electronic Stethoscope
1000w exchange regulator automatic voltage regulator circuit diagram



Top