Triac problem

[quincisoft]

Hi, I use a small mac97a6 triac to control a small 10w LED lamp with a moc3021 photo coupler driven with an esp32 output. The problem happens when I power the triac circuit with 230 V for a moment the lamp turns on, but this does not always happen. I tried changing the Gate R (330 ohm) but nothing..... Do you have any suggestions?

 

[danadak]

Not supplying proper gate trigger ? Compare gate driving circuit to this :



Regards, Dana.

 

[Delta Prime]

Welcome to Maker Pro. https://www.electronics-notes.com/a...triac-specifications-datasheet-parameters.php

The below document datasheet States A8 it includes A6 enjoy!

 

[quincisoft]

Not supplying proper gate trigger ? Compare gate driving circuit to this :

View attachment 61391

Regards, Dana.

Operation is correct when there is input on the moc the lamp comes on, and when I remove it it goes off. The problem only exists when I power the triac part for the first time.

 

[Delta Prime]

Operation is correct when there is input on the moc the lamp comes on, and when I remove it it goes off. The problem only exists when I power the triac part for the first time.

I'm not saying you're wrong. I'm saying I cannot believe you. More information is necessary.
Do you have the entire original schematic?
And any and all modifications you might have made.Thank you.

 

[quincisoft]

I'm not saying you're wrong. I'm saying I cannot believe you. More information is necessary.
Do you have the entire original schematic?
And any and all modifications you might have made.Thank you.

The diagram is what I inserted, nothing more. Also because if I keep the part relating to the gate deactivated the problem remains.
Even using the scheme you suggested where only the R values change, the problem remains

 

[Delta Prime]

Even using the scheme you suggested where only the R values change, the problem remains

Very well... I have very broad shoulders I'm more than capable of taking the brunt of your abuse. Meant for someone else! Good luck to you...

 

[quincisoft]

Very well... I have very broad shoulders I'm more than capable of taking the brunt of your abuse. Meant for someone else! Good luck to you...

I'm sorry, I didn't mean to offend you. I think there was a misunderstanding. I just said I tried your solution. Nothing else.

 

[Delta Prime]

I'm sorry, I didn't mean to offend you. I think there was a misunderstanding. I just said I tried your solution. Nothing else.

You need not to be sorry. My Superior @danadak offered the solution. I provided reference as how to navigate the datasheet for your triac. It is why I said good luck to you... Because luck favors the prepared. It will show you what is necessary to trigger the gate of your triac.
Take a photo of your setup your connections that is my suggestion.

 

[Bluejets]

Do you have any suggestions?

Supply complete schematic including power supplies.
No fritzing......
A photo of your complete circuit would also help.

 

[Harald Kapp]

Supply complete schematic including power supplies.

It's there in post #1:

 

[quincisoft]

It's there in post #1:
View attachment 61404

The power supply is that of the Italian domestic electricity network 230v ac 50Hz

 

[quincisoft]

Having noticed that the problem also occurred with the gate control circuit, I found this solution which seems to work.

 

[Delta Prime]

You're not having a problem with the triac, ESP 32 or optocoupler . You're having a problem plugging in circuits you find on the internet to fit your application. In case you want to experiment with different applications you can go ahead and try these as well... you won't learn diddly squat. But that's not the point so for future reference...

 

[quincisoft]

You're not having a problem with the triac, ESP 32 or optocoupler . You're having a problem plugging in circuits you find on the internet to fit your application. In case you want to experiment with different applications you can go ahead and try these as well... you won't learn diddly squat. But that's not the point so for future reference...

Ok, thank

 

[Delta Prime]

Ok, thank

You're welcome, kiddo.
Wouldn't you like to know why that capacitor is there?
Why there are different values of resistance in series with the gate; although the orientation of components in the schematic are same?

 

[danadak]

This might be helpful - http://www.bitsavers.org/components/ge/1972_GE_SCR_Manual_5ed.pdf


Regards, Dana.

 

[Delta Prime]

This might be helpful - http://www.bitsavers.org/components/ge/1972_GE_SCR_Manual_5ed.pdf


Regards, Dana.

Darn you....
You stole my thunder.
-Regards, Thor!

 

[Bluejets]

It's there in post #1:

The nature of the web site makes some circuits appear as only "part of" which is why I commented.
Perhaps they should fix it.