An opto-isolator contains a source (emitter) of light, almost always a near infrared light-emitting diode (LED), that converts electrical input signal into light, a closed optical channel (also called dielectrical channel, and a photo sensor, which detects incoming light and either generates electric energy directly, or modulates electric current flowing from an external power supply. The sensor can be a photoresistor, a photodiode, a phototransistor, a silicon-controlled rectifier (SCR) or a Triac. Because LEDs can sense light in addition to emitting it,construction of symmetrical, bidirectional opto-isolators is possible.
OPTO COUPLER (4 Pin)
2. LED CATHODE
3. PHOTO TRANSISTOR COLLECTOR
4. PHOTO TRANSISTOR EMITTER.
optocoupler-4N35-datasheet Click here. photo-interup-datasheet
OPTO-COUPLER TESTING: 6-PIN TYPE (DMM MEANS (DIGITAL MULTIMETER)
Negative black lead to pin-2 (LED CATHODE)
Display reading shows .983v (983 mV)
Connect DMM positive Red test lead to pin-6 (BASE)
Negative black lead to pin-5 = .618V (COLLECTOR)
Negative black lead to pin-4 = .648V (EMITTER)
Display reading shows
positive red lead to pin-5
positive red lead to pin-4
Display reading shows OL
PIN -3 No connection (6 PIN TYPE OPTOCOUPLER)
Verification: If you get reading in forward bias as 0000 or OL or 1, and in reverse bias as 0000 (or) low values the opto coupler can be FAULTY and needs replacement.
I am trying to test a MOC 3020 6-pin DIP photo coupler? in a music-with-lights type system. I need to know how to identify the six pins and would it be better to test with the component removed from the circuit board? I have 3 satellites (remotes) that do not power the connected lights and one main powering 3 light circuits where 2 are on constant and one works properly (input demands). A total of 6 separate lighting functions. Need any info available before I start throwing parts (money) into this system.
Thank you in advance for any help!
How to test R 2581 A QK407
Please help me
thanks for sharing your experience.
Most Optocouplers are 4-pin. How do you test a 2×2 (4-pin) Optocouplers?