BT139 & MOC3063

R1 is too large. According to the datasheet, the LED current (I_FT) needs to be at least 5mA for reliable triggering. Try R1 = 680 ohms.

Another thing: that snubber capacitor should be 10nF.

How were you able to see Omid's drawing? I get an error, "Hotlinking is not allowed for our FREE Accounts"

"Omid" schreef in bericht news: snipped-for-privacy@d34g2000cwd.googlegroups.com...

You should *not* post the same problem at different newsgroups separately (called multiposting). If you want to post the same question in several newsgroups address them all at once (called crossposting).

petrus bitbyter

I just clicked on the link

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In message , dated Sun, 10 Sep

What happens to the transistor in the optocoupler when the triac turns off?

In message , dated Sun, 10 Sep

It may well not be allowed, but for some of us it works. I'll put it on ABSE.

"Eeyore" wrote in message news: snipped-for-privacy@REMOVETHIS.hotmail.com...

Works OK now.

John Woodgate wrote: (snip)

There is no transistor. See:

In message , dated Sun,

PHOTOtransistor, then. Gordon Bennet!

Right-Click on the link then select "Save Target as..." , and then save the picture on your harddrive. Or you can copy the link and paste on a new browser window , in the addressbar.

OK , but i don't think it damages my IC with 1K8 . doese lower current damage the LED on the IC?

I have desined a circuit with a Triac (BT139) to swith an AC Motor that

works with 220 VAC. (Go to this link to see my Circuit

I have used a MOC3063 Optocoupler with Phase Detector capabilities. I seems work fine. but after some times (maybe some hourse) after running

the circuit fails and the motor will vibrate and will not rotate. this problem will be solve if i change the MOC3063 with new one. but the same will happen with the second ic. my question is , should i select another range of resistors with the MOC3063 ?

Does the motor vibrate all the time, or only when you push the button? Did you try reducing R1 to 680 ohms?

No , it vibrates only when i push the button . i replaced the motor with a 220V Lamp. when i pushed the button it turned On & Off periodically with a frequency that i could see , such as 10 times each second. but with a new ic , at the first hours , it turns on correctly.

Yes ,no changes.

Did you try a 10nF snubber capacitor?

You could try it without the snubber network.

What is the power rating of the motor?

"John Woodgate" = oversnipping MANIAC !!!

The one in the MOC3063 has a 600 volt "off state" rating.

Don't know anything about triac drivers - WOODDUCK ??

........ Phil

That's an awful lot of trouble to go through to get this:

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