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.
Required components:–
1. R1=470E
2. R2=470E
3. opto=4N35
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?