which triacs can i use with MOC3020

[sharadbags]

moc3020 circuit

HI
I want to drive a 230V AC load from a triac whose gate is fired by MOC3020.
The circuit diagram is at
https://obrazki.elektroda.pl/21_1228334288.jpg

as per debugging done uptill now, I found that output of MOC3020 isn't able to drive the triac gate. Currently I am using BT136. suggest something else.

 

[FvM]

triac circuit diagram

I didn't yet find a triac, that doesn't work with MOC3020, BT136 e. g. works. I don't think that your explanation is correct.

 

[Siniša]

triac moc3020

If your +Vin is higher than 3.3V, you probably blew LED.

 

[Awarapunshee]

triac diagram

Me too never experience MOC3020 that did not drive any Triac. Even one time I bought (very cheap) a Triac that carries no number on it also worked fine.
Check what Sinisa had said. Or verify your circuit connection.

ENJOY!

 

[FvM]

triacs an avr

As previously mentioned in your other same-topic thread, you either damaged the coupler, or the drive level is too low. Or the real circuit is different from the schematic.

 

[pranam77]

moc3020

Hai sharadbags
It seems ok with your schematic. Check the opto between pin 1 and 2 will give a forward bias as you'll be cheking a LED inside it. If you dont get any readings replace the MOC. If you get it, then try shorting the pin 4 and 6 while powered on. Your load should work in this way and if it works then replace the Triac as it is not triggering. Good luck

 

[sharadbags]

moc3020 triac

Hi pranam77 and everyone who replied to this topic.

I tried the following experiments and found the following results.

1) The schematic is same as layout
2) during forward bias the voltage across input diode is coming as 1.5-1.9V and in reverse bias the full voltage is appearing -3.3 V . the variation in forward voltage is observed when I changed input resistance from 470 to 47 ohm.
3) On shorting Pin 4 & 6 of MOC, still the bulb didn't lit up.
4) on shorting pin 1&2 or 2&3 of the triac, the load lit up which is obvious from the circuit diagram.

I have done experiments by replacing MOC 4 times. still the load doesn't lit.


Suggest what should I do.


Thanks
sharadbags

 

[pranam77]

triac to use with moc3020

hai sharad
You wrote
3) On shorting Pin 4 & 6 of MOC, still the bulb didn't lit up.
4) on shorting pin 1&2 or 2&3 of the triac, the load lit up which is obvious from the circuit diagram

according to your observation on point 3 it is 100% clear that the fault lies in the triac side and not the control side. Just replace the Triac and be sure that you connect the pin 4 of the Opto to the Gate. While shorting the 4&6 pins manually the triac should fire as this is what the opto does when the internal LED. Good Luck

 

[sharadbags]

moc3020 & triac circuit

Hi
can anyone give the complete schematic of triac and moc3020 along with the values of resistor to be put for lighting up a 230V AV from AVR microconttoller running at 3.1 V and can supply 15-20 ma at its port.

when i shorted pin 4 & 6 of moc and put 67K in between gate and Mt1. the bulb lit up for a very brief period and then turned off.
can you guess what happened and what has to be corrected.

 

[pranam77]

how moc3020 work

Just replace the Triac and be sure that you connect the pin 4 of the Opto to the Gate. While shorting the 4&6 pins manually the triac should fire as this is what the opto does when the internal LED. Good Luck